8 Trace Compass is a Java tool for viewing and analyzing any type of logs or traces. Its goal is to provide views, graphs, metrics, etc. to help extract useful information from traces, in a way that is more user-friendly and informative than huge text dumps.
12 Tracing is a troubleshooting technique used to understand the behavior of an instrumented application by collecting information on its execution path. A tracer is the software used for tracing. Tracing can be used to troubleshoot a wide range of bugs that are otherwise extremely challenging. These include, for example, performance problems in complex parallel systems or real-time systems.
14 Tracing is similar to logging: it consists in recording events that happen in a system at selected execution locations. However, compared to logging, it is generally aimed at developers and it usually records low-level events at a high rate. Tracers can typically generate thousands of events per second. The generated traces can easily contain millions of events and have sizes from many megabytes to tens of gigabytes. Tracers must therefore be optimized to handle a lot of data while having a small impact on the system.
16 Traces may include events from the operating system kernel (IRQ handler entry/exit, system call entry/exit, scheduling activity, network activity, etc). They can also consists of application events (a.k.a UST - User Space Tracing) or a mix of the two.
18 For the maximum level of detail, tracing events may be viewed like a log file. However, trace analyzers and viewers are available to derive useful information from the raw data coupled with knowledge of the traced program. These programs must be specially designed to handle quickly the enormous amount of data a trace may contain.
22 Trace Compass has a number of features to allow efficient handling of very large traces (and sets of large traces):
24 * Support for arbitrarily large traces (larger than available memory)
25 * Support for correlating multiple time-ordered traces
26 * Support for zooming down to the nanosecond on any part of a trace or set of traces
27 * Views synchronization of currently selected time or time range, and window time range
28 * Efficient searching and filtering of events
29 * Support for trace bookmarks
30 * Support for importing and exporting trace packages
32 There is also support for the integration of non-LTTng trace types:
35 * Dynamic creation of customized parsers (for XML and text traces)
36 * Dynamic creation of customized state systems (from XML files)
37 * Dynamic creation of customized views (from XML files)
39 Trace Compass provides the following main views:
41 * ''Project Explorer'' - an extension to the standard Eclipse Project view tailored for tracing projects
42 * ''Events'' - a versatile view that presents the raw events in tabular format with support for searching, filtering and bookmarking
43 * ''Statistics'' - a view that that provides simple statistics on event occurrences by type
44 * ''Histogram'' - a view that displays the event density with respect to time in traces
46 These views can be extended or tailored for specific trace types (e.g. kernel, HW, user app).
48 == LTTng integration ==
50 One of the main features of Trace Compass is the LTTng integration. LTTng (Linux Trace Toolkit, next generation) is a highly efficient tracing tool for Linux that can be used to track down kernel and application performance issues as well as troubleshoot problems involving multiple concurrent processes and threads. It consists of a set of kernel modules, daemons - to collect the raw tracing data - and a set of tools to control, visualize and analyze the generated data. It also provides support for user space application instrumentation.
51 For more information about LTTng, refer to the project [http://lttng.org site]
53 '''Note''': This User Guide covers the integration of the latest LTTng (up to v2.4) in Eclipse.
55 The LTTng plug-ins provide an integration for the control of the LTTng tracer as well as fetching and visualization of the traces produced. It also provides the foundation for user-defined analysis tools.
57 At present, the LTTng plug-ins support the following kernel-oriented views:
59 * ''Control Flow'' - to visualize processes state transitions
60 * ''Resources'' - to visualize system resources state transitions
61 * ''CPU usage'' - to visualize the usage of the processor with respect to the time in traces
63 Also, the LTTng plug-ins supports the following User Space traces views:
65 * ''Memory Usage'' - to visualize the memory usage per thread with respect to time in the traces
66 * ''Call Stack'' - to visualize the call stack's evolution over time
68 Finally, the LTTng plug-ins supports the following Control views:
69 * ''Control'' - to control the tracer and configure the tracepoints
71 Although the control and fetching parts are targeted at the LTTng tracer, the underlying framework can also be used to process any trace that complies with the ''Common Trace Format'' ([http://www.efficios.com/ctf CTF]). CTF specifies a very efficient and compact binary trace format that is meant to be application-, architecture-, and language-agnostic.
75 This section describes the installation of the LTTng tracer and the Trace Compass plug-ins as well as their dependencies.
79 While the Eclipse plug-ins can run on the standard Eclipse platforms (Linux, Mac, Windows), the LTTng tracer and its accompanying tools run on Linux.
81 The tracer and tools have been available for download in Ubuntu since 12.04. They can easily be installed with the following command:
84 > sudo apt-get install lttng-tools
87 For other distributions, older Ubuntu distributions, or the latest, bleeding edge LTTng tracer, please refer to the [http://lttng.org/download LTTng website] for installation information.
89 '''Note''': The LTTng tracer (and accompanying tools) is required only if you want to create your own traces (the usual case). If you intend to simply analyze existing traces then it is not necessary to install the tracer.
91 == Trace Compass Plug-ins ==
93 The easiest way to install the Trace Compass plug-ins for Eclipse is through the Install New Software menu. For information on how to use this menu, refer to this [http://help.eclipse.org/luna/index.jsp?topic=%2Forg.eclipse.platform.doc.user%2Ftasks%2Ftasks-124.htm link].
95 The Trace Compass main plug-ins are structured as a stack of features/plug-ins as following:
97 * '''CTF''' - A CTF parser that can also be used as a standalone component
98 ** ''Feature'': org.eclipse.tracecompass.ctf
99 ** ''Plug-ins'': org.eclipse.tracecompass.ctf.core, org.eclipse.tracecompass.ctf.parser
101 * '''State System Core''' - State system for TMF
102 ** ''Plug-ins'': org.eclipse.tracecompass.statesystem.core
104 * '''TMF''' - ''Tracing and Monitoring Framework'' a framework for generic trace processing
105 ** ''Feature'': org.eclipse.tracecompass.tmf
106 ** ''Plug-ins'': org.eclipse.tracecompass.tmf.core, org.eclipse.tracecompass.tmf.ui. org.eclipse.tracecompass.tmf.analysis.xml.core, org.eclipse.tracecompass.tmf.analysis.xml.ui
108 * '''CTF support for TMF''' - CTF support for the TMF Feature
109 ** ''Feature'': org.eclipse.tracecompass.tmf.ctf
110 ** ''Plug-ins'': org.eclipse.tracecompass.tmf.ctf.core
112 * '''LTTng Control''' - The wrapper for the LTTng tracer control. Can be used for kernel or application tracing.
113 ** ''Feature'': org.eclipse.tracecompass.lttng2.control
114 ** ''Plug-ins'': org.eclipse.tracecompass.lttng2.control.core, org.eclipse.tracecompass.lttng2.control.ui
116 * '''LTTng Kernel''' - Analysis components specific to Linux kernel traces
117 ** ''Feature'': org.eclipse.tracecompass.lttng2.kernel
118 ** ''Plug-ins'': org.eclipse.tracecompass.analysis.os.linux.core, org.eclipse.tracecompass.analysis.os.linux.ui, org.eclipse.tracecompass.lttng2.kernel.core, org.eclipse.tracecompass.lttng2.kernel.ui
120 * '''LTTng UST''' - Analysis components specific to Linux userspace traces
121 ** ''Feature'': org.eclipse.tracecompass.lttng2.ust
122 ** ''Plug-ins'': org.eclipse.tracecompass.lttng2.ust.core, org.eclipse.tracecompass.lttng2.ust.ui
124 == LTTng Control Dependencies ==
126 The Eclipse LTTng Control feature controls the LTTng tracer through an ''ssh'' connection, if the tracer is running locally it can use or bypass the ''ssh'' connection.
128 When using ''ssh'', the target system (where the tracer runs) needs to run an ''ssh'' server as well as ''sftp'' server (for file transfer) to which you have permission to connect.
130 On the host side (where Eclipse is running), you also need to have Eclipse Remote Services installed to handle the SSH connection and transport. The Remote Services are installed for you as a dependency of the LTTng Control feature. If necessary, it can be installed manually with the standard way (''Help'' > ''Install New Software...'' > ''General Purpose Tools'' > ''Remote Services'').
132 == Installation Verification ==
134 If you do not have any traces, sample LTTng traces can be found here [http://lttng.org/files/samples]. This page contains links to some sample LTTng 2.0 kernel traces. The trace needs to be uncompressed to be opened. The traces can also be imported directly as archive, see the [[#Importing|Importing]] section for more detail.
136 Here are the quick steps to verify that your installation is functional using a LTTng trace:
139 * Open the LTTng perspective
140 * Create a Tracing project
141 ** Right-click in the Project Explorer view and select New, Tracing Project
142 ** Enter the name of your project (e.g. "MyLTTngProject")
143 ** The project will be created. It will contain 2 empty folders: "Traces" and "Experiments"
144 * Open and visualize a sample trace
145 ** Right-click on the newly created project "Traces" folder and select "Open Trace..."
146 ** Navigate to the sample LTTng trace that you want to visualize and select any file in the trace folder
147 ** The newly imported trace should appear under the Traces folder
148 ** The trace should load and the views be populated
150 If an error message is displayed, you might want to double-check that the trace type is correctly set (right-click on the trace and "Select Trace Type...").
152 Refer to [[#Tracing Perspective]] for detailed description of the views and their usage.
154 = Trace Compass Main Features =
156 == Tracing Perspective ==
158 The '''Tracing''' perspective is part of the '''Tracing and Monitoring Framework (TMF)''' and groups the following views:
160 * [[#Project Explorer_View | Project Explorer View]]
161 * [[#Events_Editor | Events Editor]]
162 * [[#Histogram_View | Histogram View]]
163 * [[#Statistics_View | Statistics View]]
165 The views are synchronized i.e. selecting an event, a timestamp, a time range, etc will update the other views accordingly.
167 [[Image:images/TracingPerspective.png]]
169 The perspective can be opened from the Eclipse Open Perspective dialog ('''Window > Open Perspective... > Other''').
171 [[Image:images/ShowTracingPerspective.png]]
173 In addition to these views, the '''Tracing and Monitoring Framework (TMF)''' feature provides a set of generic tracing specific views, such as:
175 * [[#Colors_View | Colors View]]
176 * [[#Filters_View | Filters View]]
177 * [[#Time_Chart_View | Time Chart View]]
178 * [[#State_System_Explorer_View | State System Explorer View]]
179 * [[#Call_Stack_View | Call Stack View]]
181 The framework also supports user creation of [[#Custom_Parsers | Custom Parsers]].
183 To open one of the above '''Tracing''' views, use the Eclipse Show View dialog ('''Window > Show View > Other...'''). Then select the relevant view from the '''Tracing''' category.
185 [[Image:images/ShowTracingViews.png]]
187 Additionally, the '''LTTng Control''' feature provides an '''LTTng Tracer Control''' functionality. It comes with a dedicated '''Control View'''.
189 * [[#LTTng_Tracer_Control | LTTng Tracer Control]]
191 == Project Explorer View ==
193 The Project Explorer view is the standard Eclipse Project Explorer. '''Tracing''' projects are well integrated in the Eclipse's Common Navigator Framework. The Project Explorer shows '''Tracing''' project with a small "T" decorator in the upper right of the project folder icon.
195 === Creating a Tracing Project ===
197 A new '''Tracing''' project can be created using the New Tracing Project wizard. To create a new '''Tracing''' select '''File > New > Project...''' from the main menu bar or alternatively form the context-sensitive menu (click with right mouse button in the '''Project Explorer'''.
199 The first page of project wizard will open.
201 [[Image:images/NewTracingProjectPage1.png]]
203 In the list of project categories, expand category '''Tracing''' and select '''Tracing Project''' and the click on '''Next >'''. A second page of the wizard will show. Now enter the a name in the field '''Project Name''', select a location if required and the press on '''Finish'''.
205 [[Image:images/NewTracingProjectPage2.png]]
207 A new project will appear in the '''Project Explorer''' view.
209 [[Image:images/NewProjectExplorer.png]]
211 Tracing projects have two sub-folders: '''Traces''' which holds the individual traces, and '''Experiments''' which holds sets of traces that we want to correlate.
213 === Importing Traces to the Project ===
215 The '''Traces''' folder holds the set of traces available for a tracing project. It can optionally contain a tree of trace folders to organize traces into sub-folders. The following chapters will explain different ways to import traces to the '''Traces''' folder of a tracing project.
217 * [[#Opening a Trace | Opening a Trace]]
218 * [[#Importing | Importing]]
219 * [[#Drag and Drop | Drag and Drop]]
221 ==== Opening a Trace ====
223 To open a trace, right-click on a target trace folder and select '''Open Trace...'''.
225 [[Image:images/OpenTraceFile.png]]
227 A new dialog will show for selecting a trace to open. Select a trace file and then click on '''OK'''. Note that for traces that are directories (such as Common Trace Format (CTF) traces) any file in the trace directory can be selected to open the trace. Now, the trace viewer will attempt to detect the trace types of the selected trace. The auto detection algorithm will validate the trace against all known trace types. If multiple trace types are valid, a trace type is chosen based on a confidence criteria. The validation process and the computation of the confidence level are trace type specific. After successful validation the trace will be linked into the selected target trace folder and then opened with the detected trace type.
229 Note that a trace type is an extension point of the '''Tracing and Monitoring Framework (TMF)'''. Depending on the which features are loaded, the list of available trace types can vary.
233 To import a set of traces to a trace folder, right-click on the target folder and select '''Import...''' from the context-sensitive menu.
235 [[Image:images/ProjectImportTraceAction.png]]
237 At this point, the '''Import Trace Wizard''' will show for selecting traces to import. By default, it shows the correct destination directory where the traces will be imported to. Now, specify the location of the traces in the '''Root directory'''. For that click on the button '''Browse''', browse the media to the location of the traces and click on '''OK'''. Then select the traces to import in the list of files and folders. If the selected files include archive files (tar, zip), they will be extracted automatically and imported as well.
239 Traces can also be imported directly from an archive file such as a zip or a tar file by selecting the '''Select archive file''' option then by clicking '''Browse'''. Then select the traces to import in the list of files and folders as usual.
241 Optionally, select the '''Trace Type''' from the drop-down menu. If '''Trace Type''' is set to '''<Automatic Detection>''', the wizard will attempt to detect the trace types of the selected files. The automatic detection algorithm validates a trace against all known trace types. If multiple trace types are valid, a trace type is chosen based on a confidence criteria. The validation process and the computation of the confidence level are trace type specific. Optionally, '''Import unrecognized traces''' can be selected to import trace files that could not be automatically detected by '''<Automatic Detection>'''.
243 Select or deselect the checkboxes for '''Overwrite existing trace without warning''', '''Create links in workspace''' and '''Preserve folder structure'''. When all options are configured, click on '''Finish'''.
245 Note that traces of certain types (e.g. LTTng Kernel) are actually a composite of multiple channel traces grouped under a folder. Either the folder or its files can be selected to import the trace.
247 The option '''Preserve folder structure''' will create, if necessary, the structure of folders relative to (and excluding) the selected '''Root directory''' (or '''Archive file''') into the target trace folder.
249 [[Image:images/ProjectImportTraceDialog.png]]
251 If a trace already exists with the same name in the target trace folder, the user can choose to rename the imported trace, overwrite the original trace or skip the trace. When rename is chosen, a number is appended to the trace name, for example smalltrace becomes smalltrace(2).
253 [[Image:images/ProjectImportTraceDialogRename.png]]
255 If one selects '''Rename All''', '''Overwrite All''' or '''Skip All''' the choice will be applied for all traces with a name conflict.
257 Upon successful importing, the traces will be stored in the target trace folder. If a trace type was associated to a trace, then the corresponding icon will be displayed. If no trace type is detected the default editor icon associated with this file type will be displayed. Linked traces will have a little arrow as decorator on the right bottom corner.
259 Note that trace type is an extension point of the '''Tracing and Monitoring Framework (TMF)'''. Depending on the which features are loaded, the list of trace types can vary.
261 Alternatively, one can open the '''Import...''' menu from the '''File''' main menu, then select '''Tracing''' > '''Trace Import''' and click on '''Next >'''.
263 [[Image:images/ProjectImportWizardSelect.png]]
265 At this point, the '''Import Trace Wizard''' will show. To import traces to the tracing project, follow the instructions that were described above.
267 ==== Drag and Drop ====
269 Traces can be also be imported to a project by dragging from another tracing project and dropping to the project's target trace folder. The trace will be copied and the trace type will be set.
271 Any resource can be dragged and dropped from a non-tracing project, and any file or folder can be dragged from an external tool, into a tracing project's trace folder. The resource will be copied or imported as a new trace and it will be attempted to detect the trace types of the imported resource. The automatic detection algorithm validates a trace against all known trace types. If multiple trace types are valid, a trace type is chosen based on a confidence criteria. The validation process and the computation of the confidence level are trace type specific. If no trace type is detected the user needs to set the trace type manually.
273 To import the trace as a link, use the platform-specific key modifier while dragging the source trace. A link will be created in the target project to the trace's location on the file system.
275 If a folder containing traces is dropped on a trace folder, the full directory structure will be copied or linked to the target trace folder. The trace type of the contained traces will not be auto-detected.
277 It is also possible to drop a trace, resource, file or folder into an existing experiment. If the item does not already exist as a trace in the project's trace folder, it will first be copied or imported, then the trace will be added to the experiment.
279 === Trace Package Exporting and Importing ===
281 A trace package is an archive file that contains the trace itself and can also contain its bookmarks and its supplementary files. Including supplementary files in the package can improve performance of opening an imported trace but at the expense of package size.
285 The '''Export Trace Package Wizard''' allows users to select a trace and export its files and bookmarks to an archive on a media.
287 The '''Traces''' folder holds the set of traces available for a tracing project. To export traces contained in the '''Traces''' folder, one can open the '''Export...''' menu from the '''File''' main menu. Then select '''Trace Package Export'''
289 [[Image:images/tracePackageImages/fileExport.png]]
291 At this point, the '''Trace Package Export''' is opened. The project containing the traces has to be selected first then the traces to be exported.
293 [[Image:images/tracePackageImages/chooseTrace.png]]
295 One can also open the wizard and skip the first page by expanding the project, selecting traces or trace folders under the '''Traces''' folder, then right-clicking and selecting the '''Export Trace Package...''' menu item in the context-sensitive menu.
297 [[Image:images/tracePackageImages/exportSelectedTrace.png]]
299 Next, the user can choose the content to export and various format options for the resulting file.
301 [[Image:images/tracePackageImages/exportPackage.png]]
303 The '''Trace''' item is always selected and represents the files that constitute the trace. The '''Supplementary files''' items represent files that are typically generated when a trace is opened by the viewer. Sharing these files can speed up opening a trace dramatically but also increases the size of the exported archive file. The ''Size'' column can help to decide whether or not to include these files. Lastly, by selecting '''Bookmarks''', the user can export all the bookmarks so that they can be shared along with the trace.
305 The '''To archive file''' field is used to specify the location where to save the resulting archive.
307 The '''Options''' section allows the user to choose between a tar archive or a zip archive. Compression can also be toggled on or off.
309 When Finish button is clicked, the package is generated and saved to the media. The folder structure of the selected traces relative to the '''Traces''' folder is preserved in the trace package.
313 The '''Import Trace Package Wizard''' allows users to select a previously exported trace package from their media and import the content of the package in the workspace.
315 The '''Traces''' folder holds the set of traces for a tracing project. To import a trace package to the '''Traces''' folder, one can open the '''Import...''' menu from the '''File''' main menu. Then select '''Trace Package Import'''.
317 [[Image:images/tracePackageImages/fileImport.png]]
319 One can also open the wizard by expanding the project name, right-clicking on a target folder under the '''Traces''' folder then selecting '''Import Trace Package...''' menu item in the context-sensitive menu.
321 [[Image:images/tracePackageImages/importTraceFolder.png]]
323 At this point, the '''Trace Package Import Wizard''' is opened.
325 [[Image:images/tracePackageImages/importPackage.png]]
327 The '''From archive file''' field is used to specify the location of the trace package to export. The user can choose the content to import in the tree.
329 If the wizard was opened using the File menu, the destination project has to be selected in the '''Into project''' field.
331 When Finish is clicked, the trace is imported in the target folder. The folder structure from the trace package is restored in the target folder.
333 === Remote Fetching ===
335 It is possible to import traces automatically from one or more remote hosts according to a predefined remote profile by using the '''Fetch Remote Traces''' wizard.
337 To start the wizard, right-click on a target trace folder and select '''Fetch Remote Traces...'''.
339 [[Image:images/FetchRemoteTracesMenu.png]]
341 The wizard opens on the '''Remote Profile''' page.
343 [[Image:images/RemoteProfileWizardPageBlank.png]]
345 If the remote profile already exists, it can be selected in the '''Profile name''' combo box. Otherwise, click '''Manage Profiles''' to open the '''Remote Profiles''' preferences page.
347 ==== Remote Profile elements ====
349 [[Image:images/RemoteProfilesPreferencesPage.png]]
351 Click '''Add''' to create a new remote profile. A default remote profile template appears.
353 [[Image:images/RemoteProfilesPreferencesPageDefault.png]]
357 Edit the '''Profile name''' field to give a unique name to the new profile.
359 Under the Profile element, at least one Connection Node element must be defined.
361 ===== Connection Node =====
363 '''Node name''': Unique name for the connection within the scope of the Remote Services provider.
365 '''URI''': URI for the connection. Its scheme maps to a particular Remote Services provider. If the connection name already exists for that provider, the URI must match its connection information. The scheme '''ssh''' can be used for the Built-In SSH provider. The scheme '''file''' can be used for the local file system.
367 To view or edit existing connections, see the '''Remote Development''' > '''Remote Connections''' preferences page. On this page the user can enter a password for the connection.
369 Under the Connection Node element, at least one Trace Group element must be defined.
371 ===== Trace Group =====
373 '''Root path''': The absolute root path from where traces will be fetched. For example, ''/home/user'' or ''/C/Users/user''.
375 '''Recursive''': Check this box to search for traces recursively in the root path.
377 Under the Trace Group element, at least one Trace element must be defined.
381 '''File pattern''': A regular expression pattern to match against the file name of traces found under the root path. If the '''Recursive''' option is used, the pattern must match against the relative path of the trace, using forward-slash as a path separator. Files that do not match this pattern are ignored. If multiple Trace elements have a matching pattern, the first matching element will be used, and therefore the most specific patterns should be listed first. Following are some pattern examples:
383 * <pre><nowiki>.*</nowiki></pre> matches any trace in any folder
384 * <pre><nowiki>[^/]*\.log</nowiki></pre> matches traces with .log extension in the root path folder
385 * <pre><nowiki>.*\.log</nowiki></pre> matches traces with .log extension in any folder
386 * <pre><nowiki>folder-[^/]*/[^/]*\.log</nowiki></pre> matches traces with .log extension in folders matching a pattern
387 * <pre><nowiki>(.*/)?filename</nowiki></pre> matches traces with a specific name in any folder
389 '''Trace Type''': The trace type to assign to the traces after fetching, or '''<Automatic Detection>''' to determine the trace type automatically. Note that traces whose trace type can not be assigned according to this setting are not deleted after fetching.
391 ==== Profile editing and management ====
393 Right-click a profile element to bring up its context menu. A '''New''' child element of the appropriate type can be created. Select '''Delete''' to delete a node, or '''Cut''', '''Copy''' and '''Paste''' to move or copy elements from one profile element to another. The keyboard shortcuts can also be used.
395 Press the '''Add''' button to create a new element of the same type and following the selected element, or a new profile if the selection is empty.
397 Press the '''Remove''' button to delete the selected profile elements.
399 Press the '''Import''' button to import profiles from a previously exported XML file.
401 Press the '''Export''' button to export the selected profiles to an XML file.
403 Press the '''Move Up''' or '''Move Down''' buttons to reorder the selected profile element.
405 The filter text box can be used to filter profiles based on the profile name or connection node.
407 When the remote profile information is valid and complete, press the '''OK''' button to save the remote profiles preferences.
409 [[Image:images/RemoteProfilesPreferencesPageFull.png]]
411 ==== Selecting remote traces ====
413 Back in the '''Remote Profiles''' wizard page, select the desired profile and click '''Next >'''. Clicking '''Finish''' at this point will automatically select and download all matching traces.
415 [[Image:images/RemoteProfileWizardPageNext.png]]
417 If required, the selected remote connections are created and connection is established. The user may be prompted for a password. This can be avoided by storing the password for the connection in the '''Remote Connections''' preference page.
419 [[Image:images/FetchRemoteTracesPassword.png]]
421 The root path of every Trace Group is scanned for matching files. The result is shown in the '''Remote Traces''' wizard page.
423 [[Image:images/RemoteTracesWizardPage.png]]
425 Select the traces to fetch by checking or unchecking the desired connection node, trace group, folder or individual trace. Click '''Finish''' to complete the operation.
427 If any name conflict occurs, the user will be prompted to rename, overwrite or skip the trace, unless the '''Overwrite existing trace without warning''' option was checked in the '''Remote Profiles''' wizard page.
429 The downloaded traces will be imported to the initially selected project folder. They will be stored under a folder structure with the pattern ''<connection name>/<path>/<trace name>'' where the path is the trace's remote path relative to its trace group's root path.
431 [[Image:images/FetchRemoteTracesProject.png]]
433 === Selecting a Trace Type ===
435 If no trace type was selected a trace type has to be associated to a trace before it can be opened. To select a trace type select the relevant trace and click the right mouse button. In the context-sensitive menu, select '''Select Trace Type...''' menu item. A sub-menu will show will all available trace type categories. From the relevant category select the required trace type. The examples, below show how to select the '''Common Trace Format''' types '''Linux Kernel Trace''' and '''Generic CTF trace'''.
437 [[Image:images/SelectLTTngKernelTraceType.png]]
439 [[Image:images/SelectGenericCTFTraceType.png]]
441 After selecting the trace type, the trace icon will be updated with the corresponding trace type icon.
443 [[Image:images/ExplorerWithAssociatedTraceType.png]]
445 === Opening a Trace or Experiment ===
447 A trace or experiment can be opened by double-clicking the left mouse button on the trace or experiment in the '''Project Explorer''' view. Alternatively, select the trace or experiment in the in the '''Project Explorer''' view and click the right mouse button. Then select '''Open''' menu item of the context-sensitive menu. If there is no trace type set for a file resource then the file will be opened in the default editor associated with this file type.
449 [[Image:images/OpenTraceAction.png]]
451 When opening a trace or experiment, all currently opened views which are relevant for the corresponding trace type will be updated.
453 If a trace resource is a file (and not a directory), then the '''Open With''' menu item is available in the context-sensitive menu and can be used to open the trace source file with any applicable internal or external editor. In that case the trace will not be processed by the tracing application.
455 === Creating a Experiment ===
457 An experiment consists in an arbitrary number of aggregated traces for purpose of correlation. In the degenerate case, an experiment can consist of a single trace. The experiment provides a unified, time-ordered stream of the individual trace events.
459 To create an experiment, select the folder '''Experiments''' and click the right mouse button. Then select '''New...'''.
461 [[Image:images/NewExperimentAction.png]]
463 A new display will open for entering the experiment name. Type the name of the experiment in the text field '''Experiment Name''' and the click on '''OK'''.
465 [[Image:images/NewExperimentDialog.png]]
467 === Selecting Traces for an Experiment ===
469 After creating an experiment, traces need to be added to the experiment. To select traces for an experiment select the newly create experiment and click the right mouse button. Select '''Select Traces...''' from the context sensitive menu.
471 [[Image:images/SelectTracesAction.png]]
473 A new dialog box will open with a list of available traces. The filter text box can be used to quickly find traces. Use buttons '''Select All''' or '''Deselect All''' to select or deselect all traces. Select the traces to add from the list and then click on '''Finish'''.
475 [[Image:images/SelectTracesDialog.png]]
477 Now the selected traces will be linked to the experiment and will be shown under the '''Experiments''' folder.
479 [[Image:images/ExplorerWithExperiment.png]]
481 Alternatively, traces can be added to an experiment using [[#Drag_and_Drop | Drag and Drop]].
483 === Removing Traces from an Experiment ===
485 To remove one or more traces for an experiment select the trace(s) to remove under the Experiment folder and click the right mouse button. Select '''Remove''' from the context sensitive menu.
487 [[Image:images/RemoveTracesAction.png]]
489 After that the selected trace(s) are removed from the experiment. Note that the traces are still in the '''Traces''' folder.
491 === Renaming a Trace or Experiment ===
493 Traces and Experiment can be renamed from the '''Project Explorer''' view. To rename a trace or experiment select the relevant trace and click the right mouse button. Then select '''Rename...''' from the context sensitive menu. The trace or experiment needs to be closed in order to do this operation.
495 [[Image:images/RenameTraceAction.png]]
497 A new dialog box will show for entering a new name. Enter a new trace or experiment name respectively in the relevant text field and click on '''OK'''. If the new name already exists the dialog box will show an error and a different name has to be entered.
499 [[Image:images/RenameTraceDialog.png]]
501 [[Image:images/RenameExperimentDialog.png]]
503 After successful renaming the new name will show in the '''Project Explorer'''. In case of a trace all reference links to that trace will be updated too. Note that linked traces only changes the display name, the underlying trace resource will stay the original name.
505 Note that all supplementary files will be also handled accordingly (see also [[#Deleting Supplementary Files | Deleting Supplementary Files]]).
507 === Copying a Trace or Experiment ===
509 To copy a trace or experiment select the relevant trace or experiment in the '''Project Explorer''' view and click the right mouse button. Then select '''Copy...''' from the context sensitive menu.
511 [[Image:images/CopyTraceAction.png]]
513 A new dialog box will show for entering a new name. Enter a new trace or experiment name respectively in the relevant text field and click on '''OK'''. If the new name already exists the dialog box will show an error and a different name has to be entered.
515 [[Image:images/CopyTraceDialog.png]]
517 [[Image:images/CopyExperimentDialog.png]]
519 After successful copy operation the new trace or experiment respectively will show in the '''Project Explorer'''. In case of a linked trace, the copied trace will be a link to the original trace too.
521 Note that the directory for all supplementary files will be copied, too. (see also [[#Deleting Supplementary Files | Deleting Supplementary Files]]).
523 === Deleting a Trace or Experiment ===
525 To delete a trace or experiment select the relevant trace or experiment in the '''Project Explorer''' view and click the right mouse button. Then select '''Delete...''' from the context sensitive menu. The trace or experiment needs to be closed in order to do this operation.
527 [[Image:images/DeleteExperimentAction.png]]
529 A confirmation dialog box will open. To perform the deletion press '''OK''' otherwise select '''Cancel'''.
531 [[Image:images/DeleteExperimentConfirmationDialog.png]]
533 After successful operation the selected trace or experiment will be removed from the project. In case of a linked trace only the link will be removed. The actual trace resource remain on the disk.
535 Note that the directory for all supplementary files will be deleted, too. (see also [[#Deleting Supplementary Files | Deleting Supplementary Files]]).
537 === Deleting Supplementary Files ===
539 Supplementary files are by definition trace specific files that accompany a trace. These file could be temporary files, persistent indexes or any other persistent data files created by the LTTng integration in Eclipse during parsing a trace. For the LTTng 2.0 trace viewer a persistent state history of the Linux Kernel is created and is stored under the name '''stateHistory.ht'''. The statistics for all traces are stored under '''statistics.ht'''. Other state systems may appear in the same folder as more custom views are added.
541 All supplementary file are hidden from the user and are handled internally by the TMF. However, there is a possibility to delete the supplementary files so that there are recreated when opening a trace.
543 To delete all supplementary files from one or many traces and experiments, select the relevant traces and experiments in the '''Project Explorer''' view and click the right mouse button. Then select the '''Delete Supplementary Files...''' menu item from the context-sensitive menu.
545 [[Image:images/DeleteSupplementaryFilesAction.png]]
547 A new dialog box will open with a list of supplementary files, grouped under the trace or experiment they belong to. Select the file(s) to delete from the list and press '''OK'''. The traces and experiments that need to be closed in order to do this operation will automatically be closed.
549 [[Image:images/DeleteSupplementaryFilesDialog.png]]
551 === Link with Editor ===
553 The tracing projects support the feature '''Link With Editor''' of the Project Explorer view. With this feature it is now possible to<br/>
554 * select a trace element in the Project Explorer view and the corresponding [[#Events Editor | Events Editor]] will get focus if the relevant trace is open.
555 * select an [[#Events Editor | Events Editor]] and the corresponding trace element will be highlighted in the Project Explorer view.
557 To enable or disable this feature toggle the '''Link With Editor''' button of the Project Explorer view as shown below.
559 [[Image:images/TMF_LinkWithEditor.png]]
563 The Events editor shows the basic trace data elements (events) in a tabular format. The editors can be dragged in the editor area so that several traces may be shown side by side. These traces are synchronized by timestamp.
565 [[Image:images/LTTng2EventsEditor.png]]
567 The header displays the current trace (or experiment) name.
569 The columns of the table are defined by the fields (aspects) of the specific trace type. These are the defaults:
571 * '''Timestamp''': the event timestamp
572 * '''Type''': the event type
573 * '''Contents''': the fields (or payload) of this event
575 The first row of the table is the header row a.k.a. the Search and Filter row.
577 The highlighted event is the ''current event'' and is synchronized with the other views. If you select another event, the other views will be updated accordingly. The properties view will display a more detailed view of the selected event.
579 An event range can be selected by holding the '''Shift''' key while clicking another event or using any of the cursor keys ('''Up'''', '''Down''', '''PageUp''', '''PageDown''', '''Home''', '''End'''). The first and last events in the selection will be used to determine the current selected time range for synchronization with the other views.
581 [[Image:images/LTTng2EventProperties.png]]
583 The Events editor can be closed, disposing a trace. When this is done, all the views displaying the information will be updated with the trace data of the next event editor tab. If all the editor tabs are closed, then the views will display their empty states.
585 === Searching and Filtering ===
587 Searching and filtering of events in the table can be performed by entering matching conditions in one or multiple columns in the header row (the first row below the column header).
589 To toggle between searching and filtering, click on the 'search' ([[Image:images/TmfEventSearch.gif]]) or 'filter' ([[Image:images/TmfEventFilter.gif]]) icon in the header row's left margin, or right-click on the header row and select '''Show Filter Bar''' or '''Show Search Bar''' in the context menu.
591 To apply a matching condition to a specific column, click on the column's header row cell, type in a [http://download.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html regular expression] and press the '''ENTER''' key. You can also enter a simple text string and it will be automatically be replaced with a 'contains' regular expression.
593 When matching conditions are applied to two or more columns, all conditions must be met for the event to match (i.e. 'and' behavior).
595 To clear all matching conditions in the header row, press the '''DEL''' key.
599 When a searching condition is applied to the header row, the table will select the next matching event starting from the top currently displayed event. Wrapping will occur if there is no match until the end of the trace.
601 All matching events will have a 'search match' icon in their left margin. Non-matching events will be dimmed. The characters in each column which match the regular expression will be highlighted.
603 [[Image:images/TraceEditor-Search.png]]
605 Pressing the '''ENTER''' key will search and select the next matching event. Pressing the '''SHIFT-ENTER''' key will search and select the previous matching event. Wrapping will occur in both directions.
607 Press '''ESC''' to cancel an ongoing search.
609 Press '''DEL''' to clear the header row and reset all events to normal.
613 When a filtering condition is entered in the head row, the table will clear all events and fill itself with matching events as they are found from the beginning of the trace. The characters in each column which match the regular expression will be highlighted.
615 A status row will be displayed before and after the matching events, dynamically showing how many matching events were found and how many events were processed so far. Once the filtering is completed, the status row icon in the left margin will change from a 'stop' to a 'filter' icon.
617 [[Image:images/TraceEditor-Filter.png]]
619 Press '''ESC''' to stop an ongoing filtering. In this case the status row icon will remain as a 'stop' icon to indicate that not all events were processed.
621 Press '''DEL''' or right-click on the table and select '''Clear Filters''' from the context menu to clear the header row and remove the filtering. All trace events will be now shown in the table. Note that the currently selected event will remain selected even after the filter is removed.
623 You can also search on the subset of filtered events by toggling the header row to the Search Bar while a filter is applied. Searching and filtering conditions are independent of each other.
625 ==== Bookmarking ====
627 Any event of interest can be tagged with a bookmark.
629 To add a bookmark, double-click the left margin next to an event, or right-click the margin and select '''Add bookmark...'''. Alternatively use the '''Edit''' > '''Add bookmark...''' menu. Edit the bookmark description as desired and press '''OK'''.
631 The bookmark will be displayed in the left margin, and hovering the mouse over the bookmark icon will display the description in a tooltip.
633 The bookmark will be added to the '''Bookmarks''' view. In this view the bookmark description can be edited, and the bookmark can be deleted. Double-clicking the bookmark or selecting '''Go to''' from its context menu will open the trace or experiment and go directly to the event that was bookmarked.
635 To remove a bookmark, double-click its icon, select '''Remove Bookmark''' from the left margin context menu, or select '''Delete''' from the Bookmarks view.
637 [[Image:images/Bookmarks.png]]
639 === Copy to Clipboard ===
641 The text of selected events can be copied to the clipboard by right-clicking on the table and selecting '''Copy to Clipboard''' in the context menu. The clipboard contents will be prefixed by the column header names. For every event in the table selection, the column text will be copied to the clipboard. The column text will be tab-separated. Hidden columns will not be included in the clipboard contents.
643 === Event Source Lookup ===
645 For CTF traces using specification v1.8.2 or above, information can optionally be embedded in the trace to indicate the source of a trace event. This is accessed through the event context menu by right-clicking on an event in the table.
647 ==== Source Code ====
649 If a source file is available in the trace for the selected event, the item '''Open Source Code''' is shown in the context menu. Selecting this menu item will attempt to find the source file in all opened projects in the workspace. If multiple candidates exist, a selection dialog will be shown to the user. The selected source file will be opened, at the correct line, in its default language editor. If no candidate is found, an error dialog is shown displaying the source code information.
653 If an EMF model URI is available in the trace for the selected event, the item '''Open Model Element''' is shown in the context menu. Selecting this menu item will attempt to open the model file in the project specified in the URI. The model file will be opened in its default model editor. If the model file is not found, an error dialog is shown displaying the URI information.
655 === Exporting To Text ===
657 It is possible to export the content of the trace to a text file based on the columns displayed in the events table. If a filter (see '''[[#Filtering| Filtering]]''') was defined prior exporting only events that match the filter will be exported to the file. To export the trace to text, press the right mouse button on the events table. A context-sensitive menu will show. Select the '''Export To Text...''' menu option. A file locater dialog will open. Fill in the file name and location and then press on '''OK'''. A window with a progress bar will open till the export is finished.
659 ''Note'': The columns in the text file are separated by tabs.
661 === Collapsing of Repetitive Events ===
663 The implementation for collapsing of repetitive events is trace type specific and is only available for certain trace types. For example, a trace type could allow collapsing of consecutive events that have the same event content but not the same timestamp. If a trace type supports this feature then it is possible to select the '''Collapse Events''' menu item after pressing the right mouse button in the table.
665 When the collapsing of events is executing, the table will clear all events and fill itself with all relevant events. If the collapse condition is met, the first column of the table will show the number of times this event was repeated consecutively.
667 [[Image:images/TablePreCollapse.png]]
669 A status row will be displayed before and after the events, dynamically showing how many non-collapsed events were found and how many events were processed so far. Once the collapsing is completed, the status row icon in the left margin will change from a 'stop' to a 'filter' icon.
671 [[Image:images/TablePostCollapse.png]]
673 To clear collapsing, press the right mouse button in the table and select menu item '''Clear Filters''' in the context sensitive menu. ''Note'' that collapsing is also removed when another filter is applied to the table.
675 === Customization ===
677 The table columns can be reordered by the user by dragging the column headers. This column order is saved when the editor is closed. The setting applies to all traces of the same trace type.
679 The table columns can be hidden or restored by right-clicking on any column header and clicking on an item in the context menu to toggle its state. Clicking '''Show All''' will restore all table columns.
681 The table font can be customized by the user by changing the preference in '''Window''' > '''Preferences''' > '''General''' > '''Appearance''' > '''Colors and Fonts''' > '''Tracing''' > '''Trace event table font'''.
683 The search and filter highlight color can be customized by the user by changing the preference in '''Window''' > '''Preferences''' > '''General''' > '''Appearance''' > '''Colors and Fonts''' > '''Tracing''' > '''Trace event table highlight color'''.
687 The Histogram View displays the trace events distribution with respect to time. When streaming a trace, this view is dynamically updated as the events are received. The time axis is aligned with other views that support automatic time axis alignment (see [[#Automatic Time Axis Alignment | Automatic Time Axis Alignment]]).
689 [[Image:images/HistogramView.png]]
691 The '''Align Views''' toggle button [[Image:images/link.gif]] in the local toolbar allows to disable and enable the automatic time axis alignment of time-based views. Disabling the alignment in the Histogram view will disable this feature across all the views because it's a workspace preference.
693 The '''Hide Lost Events''' toggle button [[Image:images/hide_lost_events.gif]] in the local toolbar allows to hide the bars of lost events. When the button is selected it can be toggled again to show the lost events.
695 The '''Activate Trace Coloring''' toggle button [[Image:images/show_hist_traces.gif]] in the local toolbar allows to use separate colors for each trace of an experiment. Note that this feature is not available if your experiment contains more than twenty two traces. When activated, a legend is displayed at the bottom on the histogram view.
697 On the top left, there are three text controls:
699 * '''Selection Start''': Displays the start time of the current selection
700 * '''Selection End''': Displays the end time of the current selection
701 * '''Window Span''': Displays the current zoom window size in seconds
703 The controls can be used to modify their respective value. After validation, the other controls and views will be synchronized and updated accordingly. To modify both selection times simultaneously, press the link icon [[Image:images/link.gif]] which disables the '''Selection End''' control input.
705 The large (full) histogram, at the bottom, shows the event distribution over the whole trace or set of traces. It also has a smaller semi-transparent orange window, with a cross-hair, that shows the current zoom window.
707 The smaller (zoom) histogram, on top right, corresponds to the current zoom window, a sub-range of the event set. The window size can be adjusted by dragging the sash left beside the zoom window.
709 The x-axis of each histogram corresponds to the event timestamps. The start time and end time of the histogram range is displayed. The y-axis shows the maximum number of events in the corresponding histogram bars.
711 The vertical blue line(s) show the current selection time (or range). If applicable, the region in the selection range will be shaded.
713 The mouse can be used to control the histogram:
715 * '''Left-click''': Set a selection time
716 * '''Left-drag''': Set a selection range
717 * '''Shift-left-click or drag''': Extend or shrink the selection range
719 * '''Middle-click or Ctrl-left-click''': Center the zoom window on mouse (full histogram only)
720 * '''Middle-drag or Ctrl-left-drag''': Move the zoom window
722 * '''Right-drag''': Set the zoom window
723 * '''Shift-right-click or drag''': Extend or shrink the zoom window (full histogram only)
725 * '''Mouse wheel up''': Zoom in
726 * '''Mouse wheel down''': Zoom out
728 Hovering the mouse over an histogram bar pops up an information window that displays the start/end time of the corresponding bar, as well as the number of events (and lost events) it represents. If the mouse is over the selection range, the selection span in seconds is displayed.
730 In each histogram, the following keys are handled:
732 * '''Left Arrow''': Moves the current event to the previous non-empty bar
733 * '''Right Arrow''': Moves the current event to the next non-empty bar
734 * '''Home''': Sets the current time to the first non-empty bar
735 * '''End''': Sets the current time to the last non-empty histogram bar
736 * '''Plus (+)''': Zoom in
737 * '''Minus (-)''': Zoom out
739 == Statistics View ==
741 The Statistics View displays the various event counters that are collected when analyzing a trace. The data is organized per trace. After opening a trace, the element '''Statistics''' is added under the '''Tmf Statistics Analysis''' tree element in the Project Explorer. To open the view, double-click the '''Statistics''' tree element. Alternatively, select '''Statistics''' under '''Tracing''' within the '''Show View''' window ('''Window''' -> '''Show View''' -> '''Other...'''). This view shows 3 columns: ''Level'' ''Events total'' and ''Events in selected time range''. After parsing a trace the view will display the number of events per event type in the second column and in the third, the currently selected time range's event type distribution is shown. The cells where the number of events are printed also contain a colored bar with a number that indicates the percentage of the event count in relation to the total number of events. The statistics is collected for the whole trace. This view is part of the '''Tracing and Monitoring Framework (TMF)''' and is generic. It will work for any trace type extensions. For the LTTng 2.0 integration the Statistics view will display statistics as shown below.:
743 [[Image:images/LTTng2StatisticsView.png]]
745 By default, the statistics use a state system, therefore will load very quickly once the state system is written to the disk as a supplementary file.
749 [[Image:images/ColorsView.png]]
751 The Colors view allows the user to define a prioritized list of color settings.
753 A color setting associates a foreground and background color (used in any events table), and a tick color (used in the Time Chart view), with an event filter.
755 In an events table, any event row that matches the event filter of a color setting will be displayed with the specified foreground and background colors. If the event matches multiple filters, the color setting with the highest priority will be used.
757 The same principle applies to the event tick colors in the Time Chart view. If a tick represents many events, the tick color of the highest priority matching event will be used.
759 Color settings can be inserted, deleted, reordered, imported and exported using the buttons in the Colors view toolbar. Changes to the color settings are applied immediately, and are persisted to disk.
763 [[Image:images/FiltersView.png]]
765 The Filters view allows the user to define preset filters that can be applied to any events table.
767 The filters can be more complex than what can be achieved with the filter header row in the events table. The filter is defined in a tree node structure, where the node types can be any of '''TRACETYPE''', '''AND''', '''OR''', '''CONTAINS''', '''EQUALS''', '''MATCHES''' or '''COMPARE'''. Some nodes types have restrictions on their possible children in the tree.
769 The '''TRACETYPE''' node filters against the trace type of the trace as defined in a plug-in extension or in a custom parser. When used, any child node will have its ''type'' combo box fixed and its ''aspect'' combo box restricted to the possible aspects of that trace type.
771 The '''AND''' node applies the logical ''and'' condition on all of its children. All children conditions must be true for the filter to match. A ''not'' operator can be applied to invert the condition.
773 The '''OR''' node applies the logical ''or'' condition on all of its children. At least one children condition must be true for the filter to match. A ''not'' operator can be applied to invert the condition.
775 The '''CONTAINS''' node matches when the specified event ''aspect'' value contains the specified ''value'' string. A ''not'' operator can be applied to invert the condition. The condition can be case sensitive or insensitive. The ''type'' combo box restricts the possible aspects to those of the specified trace type.
777 The '''EQUALS''' node matches when the specified event ''aspect'' value equals exactly the specified ''value'' string. A ''not'' operator can be applied to invert the condition. The condition can be case sensitive or insensitive. The ''type'' combo box restricts the possible aspects to those of the specified trace type.
779 The '''MATCHES''' node matches when the specified event ''aspect'' value matches against the specified ''regular expression''. A ''not'' operator can be applied to invert the condition. The ''type'' combo box restricts the possible aspects to those of the specified trace type.
781 The '''COMPARE''' node matches when the specified event ''aspect'' value compared with the specified ''value'' gives the specified ''result''. The result can be set to ''smaller than'', ''equal'' or ''greater than''. The type of comparison can be numerical, alphanumerical or based on time stamp. A ''not'' operator can be applied to invert the condition. The ''type'' combo box restricts the possible aspects to those of the specified trace type.
783 For numerical comparisons, strings prefixed by "0x", "0X" or "#" are treated as hexadecimal numbers and strings prefixed by "0" are treated as octal numbers.
785 For time stamp comparisons, strings are treated as seconds with or without fraction of seconds. This corresponds to the '''TTT''' format in the '''Time Format''' preferences. The value for a selected event can be found in the '''Properties''' view under the ''Timestamp'' property. The common 'Timestamp' aspect can always be used for time stamp comparisons regardless of its time format.
787 Filters can be added, deleted, imported and exported using the buttons in the Filters view toolbar. The nodes in the view can be Cut (Ctrl-X), Copied (Ctrl-C) and Pasted (Ctrl-V) by using the buttons in the toolbar or by using the key bindings. This makes it easier to quickly build new filters from existing ones. Changes to the preset filters are only applied and persisted to disk when the '''Save filters''' button is pressed.
789 To apply a saved preset filter in an events table, right-click on the table and select '''Apply preset filter...''' > ''filter name''.
791 == Time Chart View ==
793 [[Image:images/TimeChartView.png]]
795 The Time Chart view allows the user to visualize every open trace in a common time chart. Each trace is display in its own row and ticks are display for every punctual event. As the user zooms using the mouse wheel or by right-clicking and dragging in the time scale, more detailed event data is computed from the traces. The time axis is aligned with other views that support automatic time axis alignment (see [[#Automatic Time Axis Alignment | Automatic Time Axis Alignment]]).
797 Time synchronization is enabled between the time chart view and other trace viewers such as the events table.
799 Color settings defined in the Colors view can be used to change the tick color of events displayed in the Time Chart view.
801 When a search is applied in the events table, the ticks corresponding to matching events in the Time Chart view are decorated with a marker below the tick.
803 When a bookmark is applied in the events table, the ticks corresponding to the bookmarked event in the Time Chart view is decorated with a bookmark above the tick.
805 When a filter is applied in the events table, the non-matching ticks are removed from the Time Chart view.
807 The Time Chart only supports traces that are opened in an editor. The use of an editor is specified in the plug-in extension for that trace type, or is enabled by default for custom traces.
809 The '''Align Views''' toggle button [[Image:images/link.gif]] in the local toolbar allows to disable and enable the automatic time axis alignment of time-based views. Disabling the alignment in the this view will disable this feature across all the views because it's a workspace preference.
811 == State System Explorer View ==
813 The State System Explorer view allows the user to inspect the state interval values of every attribute of a state system at a particular time.
815 The view shows a tree of currently selected traces and their registered state system IDs. For each state system the tree structure of attributes is displayed. The attribute name, quark, value, start and end time, and full attribute path are shown for each attribute.
817 To modify the time of attributes shown in the view, select a different current time in other views that support time synchronization (e.g. event table, histogram view). When a time range is selected, this view uses the begin time.
821 Custom parser wizards allow the user to define their own parsers for text or XML traces. The user defines how the input should be parsed into internal trace events and identifies the event fields that should be created and displayed. Traces created using a custom parser can be correlated with other built-in traces or traces added by plug-in extension.
823 === Creating a custom text parser ===
825 The '''New Custom Text Parser''' wizard can be used to create a custom parser for text logs. It can be launched several ways:
827 * Select '''File''' > '''New''' > '''Other...''' > '''Tracing''' > '''Custom Text Parser'''
828 * Open the '''[[#Managing custom parsers|Manage Custom Parsers]]''' dialog, select the '''Text''' radio button and click the '''New...''' button
830 [[Image:images/CustomTextParserInput.png]]
832 Fill out the first wizard page with the following information:
834 * '''Category:''' Enter a category name for the trace type.
835 * '''Trace type:''' Enter a name for the trace type, which is also the name of the custom parser.
836 * '''Time Stamp format:''' Enter the date and time pattern that will be used to output the Time Stamp.<br>
837 Note: information about date and time patterns can be found here: [../reference/api/org/eclipse/tracecompass/tmf/core/timestamp/TmfTimestampFormat.html TmfTimestampFormat]
839 Click the '''Add next line''', '''Add child line''' or '''Remove line''' buttons to create a new line of input or delete it. For each line of input, enter the following information:
841 * '''Regular expression:''' Enter a regular expression that should match the input line in the log, using capturing groups to extract the data.<br>
842 Note: information about date and time patterns can be found here: [http://java.sun.com/javase/6/docs/api/java/util/regex/Pattern.html]
844 * '''Cardinality:''' Enter the minimum and maximum number of lines matching this line's regular expression that must be found in the log. At least the minimum number of lines must be found before the parser will consider the next line. Child lines will always be considered first.
846 <u>Important note:</u> The custom parsers identify a log entry when the first line's regular expression matches (Root Line n). Each subsequent text line in the log is attempted to be matched against the regular expression of the parser's input lines in the order that they are defined (Line n.*). Only the first matching input line will be used to process the captured data to be stored in the log entry. When a text line matches a Root Line's regular expression, a new log entry is started.
848 Click the '''Add group''' or '''Remove group''' buttons to define the data extracted from the capturing groups in the line's regular expression. For each group, enter the following information:
850 * '''Name combo:''' Select a name for the extracted data:
851 ** '''Time Stamp''': Select this option to identify the time stamp data. The input's data and time pattern must be entered in the format: text box.
852 ** '''Message''': Select this option to identify the main log entry's message. This is usually a group which could have text of greater length.
853 ** '''Other''': Select this option to identify any non-standard data. The name must be entered in the name: text box.
855 * '''Action combo:''' Select the action to be performed on the extracted data:
856 ** '''Set''': Select this option to overwrite the data for the chosen name when there is a match for this group.
857 ** '''Append''': Select this option to append to the data with the chosen name, if any, when there is a match for this group.
858 ** '''Append with |''' : Select this option to append to the data with the chosen name, if any, when there is a match for this group, using a | separator between matches.
860 The '''Preview input''' text box can be used to enter any log data that will be processed against the defined custom parser. When the wizard is invoked from a selected log file resource, this input will be automatically filled with the file contents.
862 The '''Preview:''' text field of each capturing group and of the Time Stamp will be filled from the parsed data of the first matching log entry.
864 In the '''Preview input''' text box, the matching entries are highlighted with different colors:
866 * <code><span style="background:#FFFF00"> Yellow </span></code> : indicates uncaptured text in a matching line.
867 * <code><span style="background:#00FF00"> Green </span></code> : indicates a captured group in the matching line's regular expression for which a custom parser group is defined. This data will be stored by the custom parser.
868 * <code><span style="background:#FF00FF"> Magenta</span></code> : indicates a captured group in the matching line's regular expression for which there is no custom parser group defined. This data will be lost.
869 * <code> White </code> : indicates a non-matching line.
871 The first line of a matching entry is highlighted with darker colors.
873 By default only the first matching entry will be highlighted. To highlight all matching entries in the preview input data, click the '''Highlight All''' button. This might take a few seconds to process, depending on the input size.
875 Click the '''Next >''' button to go to the second page of the wizard.
877 [[Image:images/CustomTextParserOutput.png]]
879 On this page, the list of default and custom data is shown, along with a preview of the custom parser log table output.
881 The custom data output can be modified by the following options:
883 * '''Visibility:''' Select or unselect the checkbox to display the custom data or hide it.
885 * '''Column order:''' Click '''Move before''' or '''Move after''' to change the display order of custom data.
887 The table at the bottom of the page shows a preview of the custom parser log table output according to the selected options, using the matching entries of the previous page's '''Preview input''' log data.
889 Click the '''Finish''' button to close the wizard and save the custom parser.
891 === Creating a custom XML parser ===
893 The '''New Custom XML Parser''' wizard can be used to create a custom parser for XML logs. It can be launched several ways:
895 * Select '''File''' > '''New''' > '''Other...''' > '''Tracing''' > '''Custom XML Parser'''
896 * Open the '''[[#Managing custom parsers|Manage Custom Parsers]]''' dialog, select the '''XML''' radio button and click the '''New...''' button
898 [[Image:images/CustomXMLParserInput.png]]
900 Fill out the first wizard page with the following information:
902 * '''Category:''' Enter a category name for the trace type.
903 * '''Trace type:''' Enter a name for the trace type, which is also the name of the custom parser.
904 * '''Time Stamp format:''' Enter the date and time pattern that will be used to output the Time Stamp.<br>
906 Note: information about date and time patterns can be found here: [../reference/api/org/eclipse/tracecompass/tmf/core/timestamp/TmfTimestampFormat.html TmfTimestampFormat]
908 Click the '''Add document element''' button to create a new document element and enter a name for the root-level document element of the XML file.
910 Click the '''Add child''' button to create a new element of input to the document element or any other element. For each element, enter the following information:
912 * '''Element name:''' Enter a name for the element that must match an element of the XML file.
913 * '''Log entry:''' Select this checkbox to identify an element which represents a log entry. Each element with this name in the XML file will be parsed to a new log entry. At least one log entry element must be identified in the XML document. Log entry elements cannot be nested.
914 * '''Name combo:''' Select a name for the extracted data:
915 ** '''Ignore''': Select this option to ignore the extracted element's data at this level. It is still possible to extract data from this element's child elements.
916 ** '''Time Stamp''': Select this option to identify the time stamp data. The input's data and time pattern must be entered in the format: text box.
917 ** '''Message''': Select this option to identify the main log entry's message. This is usually an input which could have text of greater length.
918 ** '''Other''': Select this option to identify any non-standard data. The name must be entered in the name: text box. It does not have to match the element name.
919 * '''Action combo:''' Select the action to be performed on the extracted data:
920 ** '''Set''': Select this option to overwrite the data for the chosen name when there is a match for this element.
921 ** '''Append''': Select this option to append to the data with the chosen name, if any, when there is a match for this element.
922 ** '''Append with |''' : Select this option to append to the data with the chosen name, if any, when there is a match for this element, using a | separator between matches.
924 Note: An element's extracted data 'value' is a parsed string representation of all its attributes, children elements and their own values. To extract more specific information from an element, ignore its data value and extract the data from one or many of its attributes and children elements.
926 Click the '''Add attribute''' button to create a new attribute input from the document element or any other element. For each attribute, enter the following information:
928 * '''Attribute name:''' Enter a name for the attribute that must match an attribute of this element in the XML file.
929 * '''Name combo:''' Select a name for the extracted data:
930 ** '''Time Stamp''': Select this option to identify the time stamp data. The input's data and time pattern must be entered in the format: text box.
931 ** '''Message''': Select this option to identify the main log entry's message. This is usually an input which could have text of greater length.
932 ** '''Other''': Select this option to identify any non-standard data. The name must be entered in the name: text box. It does not have to match the element name.
933 * '''Action combo:''' Select the action to be performed on the extracted data:
934 ** '''Set''': Select this option to overwrite the data for the chosen name when there is a match for this element.
935 ** '''Append''': Select this option to append to the data with the chosen name, if any, when there is a match for this element.
936 ** '''Append with |''' : Select this option to append to the data with the chosen name, if any, when there is a match for this element, using a | separator between matches.
938 Note: A log entry can inherited input data from its parent elements if the data is extracted at a higher level.
940 Click the '''Feeling lucky''' button to automatically and recursively create child elements and attributes for the current element, according to the XML element data found in the '''Preview input''' text box, if any.
942 Click the '''Remove element''' or '''Remove attribute''' buttons to remove the extraction of this input data. Take note that all children elements and attributes are also removed.
944 The '''Preview input''' text box can be used to enter any XML log data that will be processed against the defined custom parser. When the wizard is invoked from a selected log file resource, this input will be automatically filled with the file contents.
946 The '''Preview:''' text field of each capturing element and attribute and of the Time Stamp will be filled from the parsed data of the first matching log entry. Also, when creating a new child element or attribute, its element or attribute name will be suggested if possible from the preview input data.
948 Click the '''Next >''' button to go to the second page of the wizard.
950 [[Image:images/CustomXMLParserOutput.png]]
952 On this page, the list of default and custom data is shown, along with a preview of the custom parser log table output.
954 The custom data output can be modified by the following options:
956 * '''Visibility:''' Select or unselect the checkbox to display the custom data or hide it.
957 * '''Column order:''' Click '''Move before''' or '''Move before''' to change the display order of custom data.
959 The table at the bottom of the page shows a preview of the custom parser log table output according to the selected options, using the matching entries of the previous page's '''Preview input''' log data.
961 Click the '''Finish''' button to close the wizard and save the custom parser.
963 === Managing custom parsers ===
965 The '''Manage Custom Parsers''' dialog is used to manage the list of custom parsers used by the tool. To open the dialog:
967 * Open the '''Project Explorer''' view.
968 * Select '''Manage Custom Parsers...''' from the '''Traces''' folder context menu, or from a trace's '''Select Trace Type...''' context sub-menu.
970 [[Image:images/ManageCustomParsers.png]]
972 The ordered list of currently defined custom parsers for the selected type is displayed on the left side of the dialog.
974 To change the type of custom parser to manage, select the '''Text''' or '''XML''' radio button.
976 The following actions can be performed from this dialog:
980 Click the '''New...''' button to launch the '''New Custom Parser''' wizard.
984 Select a custom parser from the list and click the '''Edit...''' button to launch the '''Edit Custom Parser''' wizard.
988 Select a custom parser from the list and click the '''Delete''' button to remove the custom parser.
992 Click the '''Import...''' button and select a file from the opened file dialog to import all its custom parsers. If any parser conflicts with an existing built-in or custom trace type, the user will be prompted to skip or rename the imported parser.
996 Select a custom parser from the list, click the '''Export...''' button and enter or select a file in the opened file dialog to export the custom parser. Note that if an existing file containing custom parsers is selected, the custom parser will be appended to the file.
998 === Opening a trace using a custom parser ===
1000 Once a custom parser has been created, any [[#Importing Traces to the Project|imported trace]] file can be opened and parsed using it.
1004 * Select a trace in the '''Project Explorer''' view
1005 * Right-click the trace and select '''Select Trace Type...''' > ''category name'' > ''parser name''
1006 * Double-click the trace or right-click it and select '''Open'''
1008 The trace will be opened in an editor showing the events table, and an entry will be added for it in the Time Chart view.
1010 == Automatic Time Axis Alignment ==
1012 Trace Compass supports automatic alignment of the time axis for time base views. The user now can resize the time window of one view and all other open views will align to the new window size and position. The automatic alignment is optional and can be disabled and enabled using the '''Align Views''' toolbar button. Disabling or enabling it in one view it will disable and enable it for all view since it's a workspace wide setting.
1014 [[Image:images/TimeAlignment_sash.png]]
1016 = LTTng Tracer Control =
1018 The LTTng Tracer Control in Eclipse for the LTTng Tracer toolchain version v2.0 (or later) is done using SSH and requires an SSH server to be running on the remote host. For the SSH connection the SSH implementation of Remote Services is used. The functions to control the LTTng tracer (e.g. start and stop), either locally or remotely, are available from a dedicated Control View.
1020 In the following sections the LTTng 2.0 tracer control integration in Eclipse is described. Please refer to the LTTng 2.0 tracer control command line manual for more details and descriptions about all commands and their command line parameters [[#References | References]].
1023 To open the Control View, select '''Window->Show View->Other...->LTTng->Control View''.
1025 [[Image:images/LTTngControlView.png]]
1027 === Creating a New Connection to a Remote Host ===
1029 To connect to a remote host, select the '''New Connection''' button in the Control View.
1031 [[Image:images/LTTngControlViewConnect.png]]
1033 A new dialog is opened for selecting a remote connection. You can also edit or define a remote connection from here.
1035 [[Image:images/LTTng2NewConnection.png]]
1037 To define a new remote host using the default SSH service, select '''Buit-in SSH''' and then select '''Create...'''. This will start the standard '''New Connection''' wizard provided by the Remote Services plugin. Similar, to edit the definition of a remote connection, select '''Edit...''' and use the '''Edit Connection''' wizard provided by the SSH service. In case you have installed an additional adapter for the Remote Services, you can choose to define a remote connection based on this adapter.
1039 [[Image:images/LTTng2NewRemoteConnection.png]]
1041 To use an existing connection definition, select the relevant entry in the tree and then select '''Ok'''.
1043 [[Image:images/LTTng2SelectConnection.png]]
1045 A new display will show for providing the user name and password. This display only opens if no password had been saved before. Enter user name and password in the '''Password Required''' dialog box and select '''Ok'''.
1047 [[Image:images/LTTng2EnterPassword.png]]
1049 After pressing '''Ok''' the SSH connection will be established and after successful login the Control View implementation retrieves the LTTng Tracer Control information. This information will be displayed in the Control View in form of a tree structure.
1051 [[Image:images/LTTng2ControlViewFilled.png]]
1053 The top level tree node is the representation of the remote connection (host). The connection name of the connection will be displayed. Depending on the connection state different icons are displayed. If the node is '''CONNECTED''' the icon is shown [[Image:images/Target_connected.gif]], otherwise (states '''CONNECTING''', '''DISCONNNECTING''' or '''DISCONNECTED''' the icon is [[Image:images/Target_disconnected.gif]].
1055 Under the host level two folder groups are located. The first one is the '''Provider''' group. The second one is the '''Sessions''' group.
1057 Under the '''Provider''' group all trace providers are displayed. Trace providers are '''Kernel''' and any user space application that supports UST tracing. Under each provider a corresponding list of events are displayed.
1059 Under the '''Sessions''' group all current sessions will be shown. The level under the sessions show the configured domains. Currently the LTTng 2.0 Tracer Toolchan supports domain '''Kernel''' and '''UST global'''. Under each domain the configured channels will be displayed. The last level is under the channels where the configured events are displayed.
1061 Each session can be '''ACTIVE''' or '''INACTIVE'''. Active means that tracing has been started, inactive means that the tracing has been stopped. Depending on the state of a session a different icon is displayed. The icon for an active session is [[Image:images/Session_active.gif]]. The icon for an inactive session is [[Image:images/Session_inactive.gif]].
1063 Each channel can be '''ENABLED''' or '''DISABLED'''. An enabled channel means that all configured events of that channel will be traced and a disabled channel won't trace any of its configured events. Different icons are displayed depending on the state of the channel. The icon for an enabled channel is [[Image:images/Channel.gif]] and the icon for a disabled channel is [[Image:images/Channel_disabled.gif]].
1065 Events within a channel can be in state '''ENABLED''' or '''DISABLED'''. Enabled events are stored in the trace when passed during program execution. Disabled events on the other hand won't be traced. Depending on the state of the event the icons for the event is different. An enabled event has the icon [[Image:images/Event_enabled.gif]] and a disabled event the icon [[Image:images/Event_disabled.gif]].
1067 === Disconnecting from a Remote Host ===
1069 To disconnect from a remote host, select the host in the Control View and press the '''Disconnect''' button. Alternatively, press the right mouse button. A context-sensitive menu will show. Select the '''Disconnect''' button.
1071 [[Image:images/LTTng2ControlViewDisconnect.png]]
1073 === Connecting to a Remote Host ===
1075 To connect to a remote host, select the host in the Control View and press the '''Connect''' button. Alternatively, press the right mouse button. A context-sensitive menu will show. Select the '''Connect''' button. This will start the connection process as discribed in [[#Creating a New Connection to a Remote Host | Creating a New Connection to a Remote Host]].
1077 [[Image:images/LTTng2ControlViewConnect.png]]
1079 === Deleting to a Remote Host Connection ===
1081 To delete a remote host connection, select the host in the Control View and press the '''Delete''' button. Alternatively, press the right mouse button. A context-sensitive menu will show. Select the '''Delete''' button. For that command to be active the connection state has to be '''DISCONNECTED''' and the trace has to be closed.
1083 [[Image:images/LTTng2ControlViewDelete.png]]
1085 === Creating a Tracing Session ===
1086 To create a tracing session, select the tree node '''Sessions''' and press the right mouse button. Then select the '''Create Session...''' button of the context-sensitive menu.
1088 [[Image:images/LTTng2CreateSessionAction.png]]
1090 A dialog box will open for entering information about the session to be created.
1092 [[Image:images/LTTng2CreateSessionDialog.png]]
1094 Fill in the '''Session Name''' and optionally the '''Session Path''' and press '''Ok'''. Upon successful operation a new session will be created and added under the tree node '''Sessions'''.
1096 === Creating a Tracing Session With Advanced Options ===
1097 LTTng Tools version v2.1.0 introduces the possibility to configure the trace output location at session creation time. The trace can be stored in the (tracer) local file system or can be transferred over the network.
1099 To create a tracing session and configure the trace output, open the trace session dialog as described in chapter [[#Creating a Tracing Session | Creating a Tracing Session]]. A dialog box will open for entering information about the session to be created.
1101 [[Image:images/LTTng2CreateSessionDialog_Advanced.png]]
1103 The button '''Advanced >>>''' will only show if the remote host has LTTng Tools v2.1.0 installed. To configure the trace output select the '''Advanced >>>''' button. The Dialog box will be shown new fields to configure the trace output location.
1105 [[Image:images/LTTng2CreateSessionDialog_TracePath.png]]
1107 By default, the button '''Use same protocol and address for data and control''' is selected which allows to configure the same '''Protocol''' and '''Address''' for both data URL and control URL.
1109 If button '''Use same protocol and address for data and control''' is selected the '''Protocol''' can be '''net''' for the default network protocol which is TCP (IPv4), '''net6''' for the default network protocol which is TCP (IPv6) and '''file''' for the local file system. For '''net''' and '''net6''' the port can be configured. Enter a value in '''Port''' for data and control URL or keep them empty for the default port to be used. Using '''file''' as protocol no port can be configured and the text fields are disabled.
1111 If button '''Use same protocol and address for data and control''' is not selected the '''Protocol''' can be '''net''' for the default network protocol which is TCP (IPv4), '''net6''' for the default network protocol which is TCP (IPv6), '''tcp''' for the network protocol TCP (IPv4) and '''tcp6''' for the network protocol TCP (IPv6). Note that for '''net''' and '''net6''' always the default port is used and hence the port text fields are disabled. To configure non-default ports use '''tcp''' or '''tcp6'''.
1113 The text field '''Trace Path''' allows for specifying the path relative to the location defined by the '''relayd''' or relative to the location specified by the '''Address''' when using protocol '''file'''. For more information about the '''relayd''' see '''LTTng relayd User Manual''' in chapter [[#References | References]].
1115 To create a session with advanced options, fill in the relevant parameters and press '''Ok'''. Upon successful operation a new session will be created and added under the tree node '''Sessions'''.
1117 === Creating a Snapshot Tracing Session ===
1118 LTTng Tools version v2.3.0 introduces the possibility to create snapshot tracing sessions. After starting tracing the trace events are not stored on disk or over the network. They are only transfered to disk or over the network when the user records a snapshot. To create such a snapshot session, open the trace session dialog as described in chapter [[#Creating a Tracing Session | Creating a Tracing Session]].
1120 [[Image:images/LTTng2CreateSessionDialog_Snapshot.png]]
1122 Fill in all necessary information, select the radio button for '''Snapshot Mode''' and press '''Ok'''. By default, the location for the snapshot output will be on the host where the host is located.
1124 Refer to chapter [[#Recording a Snapshot | Recording a Snapshot]] for how to create a snapshot.
1126 === Creating a Live Tracing Session ===
1127 LTTng Tools version v2.4.0 introduces the possibility to create live tracing sessions. The live mode allows you to stream the trace and view it while it's being recorded. To create such a live session, open the trace session dialog as described in chapter [[#Creating a Tracing Session | Creating a Tracing Session]].
1129 [[Image:images/LTTng2CreateSessionDialog_Live.png]]
1131 In the advanced options, it is possible to set the '''Live Delay'''. The '''Live Delay''' is the delay in micro seconds before the data is flushed and streamed.
1133 [[Image:images/LTTng2CreateSessionDialog_Live_Advanced.png]]
1135 Fill in all necessary information, select the radio button for '''Live Mode''' and press '''Ok'''.
1137 === Enabling Channels - General ===
1139 Enabling channels can be done using a session tree node when the domain hasn't be created in the session or, alternatively on a domain tree node of a session in case the domain is already available.
1141 === Enabling Channels On Session Level ===
1143 To enable a channel, select the tree node of the relevant session and press the right mouse button. Then select the '''Enable Channel...''' button of the context-sensitive menu.
1145 [[Image:images/LTTng2CreateChannelAction.png]]
1147 A dialog box will open for entering information about the channel to be created.
1149 [[Image:images/LTTng2CreateChannelDialog.png]]
1151 By default the domain '''Kernel''' is selected. To create a UST channel, select '''UST''' under the domain section. The label <Default> in any text box indicates that the default value of the tracer will be configured. To initialize the dialog box press button '''Default'''.
1153 If required update the following channel information and then press '''Ok'''.
1155 * '''Channel Name''': The name of the channel.
1156 * '''Sub Buffer size''': The size of the sub-buffers of the channel (in bytes).
1157 * '''Number of Sub Buffers''': The number of sub-buffers of the channel.
1158 * '''Switch Timer Interval''': The switch timer interval.
1159 * '''Read Timer Interval''': The read timer interval.
1160 * '''Discard Mode''': '''Overwrite''' events in buffer or '''Discard''' new events when buffer is full.
1162 Upon successful operation, the requested domain will be created under the session tree node as well as the requested channel will be added under the domain. The channel will be '''ENABLED'''.
1164 === Configuring Trace File Rotation ===
1166 Since LTTng Tools v2.2.0 it is possible to set the maximum size of trace files and the maximum number of them. These options are located in the same dialog box that is used for enabling channels.
1168 [[Image:images/LTTng2CreateChannelDialogFileRotation.png]]
1170 * '''Maximum size of trace files''': The maximum size of trace files
1171 * '''Maximum number of trace files''': The maximum number of trace files
1173 === Configuring per UID and per PID Buffers (UST only) ===
1175 Since LTTng Tools v2.2.0 it is possible to configure the type of buffers for '''UST''' application. It is now possible to choose between per '''UID''' buffers (per user ID) and per '''PID''' buffers (per process ID) using the dialog box for enabling channels.
1177 [[Image:images/LTTng2CreateChannelDialogPerUIDBuffers.png]]
1179 * '''Per PID buffers''': To activate the per PID buffers option for UST channels
1180 * '''Per UID buffers''': To activate the per UID buffers option for UST channels
1182 If no buffer type is selected then the default value of the tracer will be configured.
1184 Note that '''Global shared buffers''' is only for kernel channel and is pre-selected when '''Kernel''' is selected in the dalog box.
1186 === Configuring Periodical Flush for metadata Channel ===
1188 Since LTTng Tools v2.2.0 it is possible to configure periodical flush for the metadata channel. To set this, use the checkbox '''Configure metadata channel''' then fill the switch timer interval.
1190 [[Image:images/LTTng2CreateChannelDialogMetadataFlush.png]]
1192 === Enabling Channels On Domain Level ===
1194 Once a domain is available, channels can be enabled directly using the domain. To enable a channel under an existing domain, select the tree node of the relevant domain and press the right mouse button. Then select the '''Enable Channel...''' button of the context-sensitive menu.
1196 [[Image:images/LTTng2CreateChannelOnDomainAction.png]]
1198 The dialog box for enabling channel will open for entering information about the channel to be created. Note that the domain is pre-selected and cannot be changed. Fill the relevant information and press '''Ok'''.
1200 === Enabling and Disabling Channels ===
1202 To disable one or more enabled channels, select the tree nodes of the relevant channels and press the right mouse button. Then select the '''Disable Channel''' menu item of the context-sensitive menu.
1204 [[Image:images/LTTng2DisableChannelAction.png]]
1206 Upon successful operation, the selected channels will be '''DISABLED''' and the icons for the channels will be updated.
1208 To enable one or more disabled channels, select the tree nodes of the relevant channels and press the right mouse button. Then select the '''Enable Channel''' menu item of the context-sensitive menu.
1210 [[Image:images/LTTng2EnableChannelAction.png]]
1212 Upon successful operation, the selected channels will be '''ENABLED''' and the icons for the channels will be updated.
1214 === Enabling Events - General ===
1216 Enabling events can be done using different levels in the tree node. It can be done on the session, domain level and channel level. For the case of session or domain, i.e. when no specific channels is assigned then enabling of events is done on the default channel with the name '''channel0''' which created, if not already exists, by the LTTng tracer control on the server side.
1218 === Enabling Kernel Events On Session Level ===
1220 To enable events, select the tree node of the relevant session and press the right mouse button. Then select the '''Enable Event (default channel)...''' button of the context-sensitive menu.
1222 [[Image:images/LTTng2EventOnSessionAction.png]]
1224 A dialog box will open for entering information about events to be enabled.
1226 [[Image:images/LTTng2EventOnSessionDialog.png]]
1228 By default the domain '''Kernel''' is selected and the kernel specific data sections are created. From this dialog box kernel '''Tracepoint''' events, '''System calls (Syscall)''', a '''Dynamic Probe''' or a '''Dynamic Function entry/return''' probe can be enabled. Note that events of one of these types at a time can be enabled.
1230 To enable '''Tracepoint''' events, first select the corresponding '''Select''' button, then select either all tracepoins (select '''All''') or select selectively one or more tracepoints in the displayed tree of tracepoints and finally press '''Ok'''.
1232 [[Image:images/LTTng2TracepointEventsDialog.png]]
1234 Upon successful operation, the domain '''Kernel''' will be created in the tree (if neccessary), the default channel with name "channel0" will be added under the domain (if necessary) as well as all requested events of type '''TRACEPOINT''' under the channel. The channel and events will be '''ENABLED'''.
1236 [[Image:images/LTTng2EnabledKernelTracepoints.png]]
1238 To enable all '''Syscalls''', select the corresponding '''Select''' button and press '''Ok'''.
1240 [[Image:images/LTTng2SyscallsDialog.png]]
1242 Upon successful operation, the event with the name '''syscalls''' and event type '''SYSCALL''' will be added under the default channel (channel0). If necessary the domain '''Kernel''' and the channel '''channel0''' will be created.
1244 [[Image:images/LTTng2EnabledKernelSyscalls.png]]
1246 To enable a '''Dynamic Probe''' event, select the corresponding '''Select''' button, fill the '''Event Name''' and '''Probe''' fields and press '''Ok'''. Note that the probe can be an address, symbol or a symbol+offset where the address and offset can be octal (0NNN...), decimal (NNN...) or hexadecimal (0xNNN...).
1248 [[Image:images/LTTng2ProbeEventDialog.png]]
1250 Upon successful operation, the dynamic probe event with the given name and event type '''PROBE''' will be added under the default channel (channel0). If necessary the domain '''Kernel''' and the channel '''channel0''' will be created.
1252 [[Image:images/LTTng2EnabledKernelProbeEvent.png]]
1254 To enable a '''Dynamic Function entry/return Probe''' event, select the corresponding '''Select''' button, fill the '''Event Name''' and '''Function''' fields and press '''Ok'''. Note that the funtion probe can be an address, symbol or a symbol+offset where the address and offset can be octal (0NNN...), decimal (NNN...) or hexadecimal (0xNNN...).
1256 [[Image:images/LTTng2FunctionEventDialog.png]]
1258 Upon successful operation, the dynamic function probe event with the given name and event type '''PROBE''' will be added under the default channel (channel0). If necessary the domain '''Kernel''' and the channel '''channel0''' will be created.
1260 [[Image:images/LTTng2EnabledFunctionProbeEvent.png]]
1262 === Enabling UST Events On Session Level ===
1264 For enabling UST events, first open the enable events dialog as described in section [[#Enabling Kernel Events On Session Level | Enabling Kernel Events On Session Level]] and select domain '''UST'''.
1266 To enable '''Tracepoint''' events, first select the corresponding '''Select''' button, then select either all tracepoins (select '''All''') or select selectively one or more tracepoints in the displayed tree of tracepoints and finally press '''Ok'''.
1268 [[Image:images/LTTng2UstTracepointEventsDialog.png]]
1270 Upon successful operation, the domain '''UST global''' will be created in the tree (if neccessary), the default channel with name "channel0" will be added under the domain (if necessary) as well as all requested events under the channel. The channel and events will be '''ENABLED'''. Note that for the case that '''All''' tracepoints were selected the wildcard '''*''' is used which will be shown in the Control View as below.
1272 [[Image:images/LTTng2EnabledAllUstTracepoints.png]]
1274 For UST it is possible to enable '''Tracepoint''' events using a wildcard. To enable '''Tracepoint''' events with a wildcard, select first the corresponding '''Select''' button, fill the '''Wildcard''' field and press '''Ok'''.
1276 [[Image:images/LTTng2UstWildcardEventsDialog.png]]
1278 Upon successful operation, the event with the given wildcard and event type '''TRACEPOINT''' will be added under the default channel (channel0). If necessary the domain '''UST global''' and the channel '''channel0''' will be created.
1280 [[Image:images/LTTng2EnabledUstWildcardEvents.png]]
1282 For UST it is possible to enable '''Tracepoint''' events using log levels. To enable '''Tracepoint''' events using log levels, select first the corresponding '''Select''' button, select a log level from the drop down menu, fill in the relevant information (see below) and press '''Ok'''.
1284 * '''Event Name''': Name to display
1285 * '''loglevel''': To specify if a range of log levels (0 to selected log level) shall be configured
1286 * '''loglevel-only''': To specify that only the specified log level shall be configured
1288 [[Image:images/LTTng2UstLoglevelEventsDialog.png]]
1290 Upon successful operation, the event with the given event name and event type '''TRACEPOINT''' will be added under the default channel (channel0). If necessary the domain '''UST global''' and the channel '''channel0''' will be created.
1292 [[Image:images/LTTng2EnabledUstLoglevelEvents.png]]
1294 === Enabling Events On Domain Level ===
1296 Kernel events can also be enabled on the domain level. For that select the relevant domain tree node, click the right mouse button and the select '''Enable Event (default channel)...'''. A new dialog box will open for providing information about the events to be enabled. Depending on the domain, '''Kernel''' or '''UST global''', the domain specifc fields are shown and the domain selector is preselected and read-only.
1298 [[Image:images/LTTng2EventOnDomainAction.png]]
1300 To enable events for domain '''Kernel''' follow the instructions in section [[#Enabling Kernel Events On Session Level | Enabling Kernel Events On Session Level]], for domain '''UST global''', see section [[#Enabling UST Events On Session Level | Enabling UST Events On Session Level]].
1301 The events will be add to the default channel '''channel0'''. This channel will be created by on the server side if neccessary.
1303 === Enabling Events On Channel Level ===
1305 Kernel events can also be enabled on the channel level. If necessary, create a channel as described in sections [[#Enabling Channels On Session Level | Enabling Channels On Session Level]] or [[#Enabling Channels On Domain Level | Enabling Channels On Domain Level]].
1307 Then select the relevant channel tree node, click the right mouse button and the select '''Enable Event...'''. A new dialog box will open for providing information about the events to be enabled. Depending on the domain, '''Kernel''' or '''UST global''', the domain specifc fields are shown and the domain selector is preselected and read-only.
1309 [[Image:images/LTTng2EventOnChannelAction.png]]
1311 To enable events for domain '''Kernel''' follow the instructions in section [[#Enabling Kernel Events On Session Level | Enabling Kernel Events On Session Level]], for domain '''UST global''' [[#Enabling UST Events On Session Level | Enabling UST Events On Session Level]].
1313 When enabling events on the channel level, the events will be add to the selected channel.
1315 === Enabling and Disabling Events ===
1317 To disable one or more enabled events, select the tree nodes of the relevant events and click the right mouse button. Then select '''Disable Event''' menu item in the context-sensitive menu.
1319 [[Image:images/LTTng2DisableEventAction.png]]
1321 Upon successful operation, the selected events will be '''DISABLED''' and the icons for these events will be updated.
1323 To enable one or more disabled events, select the tree nodes of the relevant events and press the right mouse button. Then select the '''Enable Event''' menu item of the context-sensitive menu.
1325 [[Image:images/LTTng2EnableEventAction.png]]
1327 Upon successful operation, the selected events will be '''ENABLED''' and the icons for these events will be updated.
1329 '''Note''': There is currently a limitation for kernel event of type '''SYSCALL'''. This kernel event can not be disabled. An error will appear when trying to disable this type of event. A work-around for that is to have the syscall event in a separate channel and disable the channel instead of the event.
1331 === Enabling Tracepoint Events From Provider ===
1333 It is possible to enable events of type '''Tracepoint''' directly from the providers and assign the enabled event to a session and channel. Before doing that a session has to be created as described in section [[#Creating a Tracing Session | Creating a Tracing Session]]. Also, if other than default channel '''channel0''' is required, create a channel as described in sections [[#Enabling Channels On Session Level | Enabling Channels On Session Level]] or [[#Enabling Channels On Domain Level | Enabling Channels On Domain Level]].
1335 To assign tracepoint events to a session and channel, select the events to be enabled under the provider (e.g. provider '''Kernel'''), click right mouse button and then select '''Enable Event...''' menu item from the context sensitive menu.
1337 [[Image:images/LTTng2AssignEventAction.png]]
1339 A new display will open for defining the session and channel.
1341 [[Image:images/LTTng2AssignEventDialog.png]]
1343 Select a session from the '''Session List''' drop-down menu, a channel from the '''Channel List''' drop-down menu and the press '''Ok'''. Upon successful operation, the selected events will be added to the selected session and channel of the domain that the selected provider belongs to. In case that there was no channel available, the domain and the default channel '''channel0''' will be created for corresponding session. The newly added events will be '''ENABLED'''.
1345 [[Image:images/LTTng2AssignedEvents.png]]
1347 === Configuring Filter Expression When Enabling Events ===
1349 It is possible to provide a filter expression when enabling events for UST or Kernel. This feature has been available for UST since LTTng v2.1.0 and for Kernel since v2.7.0. To configure a filter expression, open the enable event dialog as described in previous chapters [[#Enabling UST Events On Session Level | Enabling UST Events On Session Level]], [[#Enabling Kernel Events On Session Level | Enabling Kernel Events On Session Level]], [[#Enabling Events On Domain Level | Enabling Events On Domain Level]] or [[#Enabling Events On Channel Level | Enabling Events On Channel Level]]. Then configure the relevant events and enter the filter expression in the '''Filter Expression''' text field.
1351 [[Image:images/LTTng2EnableEventWithFilter.png]] [[Image:images/LTTng2EnableEventWithKernelFilter.png]]
1353 Alternatively, open the dialog box for assigning events to a session and channel described in [[#Enabling Tracepoint Events From Provider | Enabling Tracepoint Events From Provider]] and enter the filter expression in the '''Filter Expression''' text field.
1355 [[Image:images/LTTng2AssignEventDialogWithFilter.png]]
1357 For the syntax of the filter expression refer to the '''LTTng Tracer Control Command Line Tool User Manual''' of chapter [[#References |References]].
1359 === Adding Contexts to Channels and Events of a Domain ===
1361 It is possible to add contexts to channels and events. Adding contexts on channels and events from the domain level, will enable the specified contexts to all channels of the domain and all their events. To add contexts on the domain level, select a domain, click right mouse button on a domain tree node (e.g. provider '''Kernel''') and select the menu item '''Add Context...''' from the context-sensitive menu.
1363 [[Image:images/LTTng2AddContextOnDomainAction.png]]
1365 A new display will open for selecting one or more contexts to add.
1367 [[Image:images/LTTng2AddContextDialog.png]]
1369 The tree shows all available context that can be added. Select one or more context and the press '''Ok'''. Upon successful operation, the selected context will be added to all channels and their events of the selected domain.
1371 '''Note''': The LTTng UST tracer only supports contexts '''procname''', '''pthread_id''', '''vpid''' '''vtid'''. Adding any other contexts in the UST domina will fail.
1373 === Adding Contexts to All Events of a Channel ===
1375 Adding contexts on channels and events from the channel level, will enable the specified contexts to all events of the selected channel. To add contexts on the channel level, select a channel, click right mouse button on a channel tree node and select the menu item '''Add Context...''' from the context-sensitive menu.
1377 [[Image:images/LTTng2AddContextOnChannelAction.png]]
1379 A new display will open for selecting one or more contexts to add. Select one or more contexts as described in chapter [[#Adding Contexts to Channels and Events of a Domain | Adding Contexts to Channels and Events of a Domain]]. Upon successful operation, the selected context will be added to all channels and their events of the selected domain. '''Note''' that the LTTng 2.0 tracer control on the remote host doesn't provide a way to retrieve added contexts. Hence it's not possible to display the context information in the GUI.
1381 === Adding Contexts to an Event of a Specific Channel ===
1383 Adding contexts to an event of a channel is only available in LTTng Tools versions v2.0.0-2.1.x. The menu option won't be visible for LTTng Tools version v2.2.0 or later. To add contexts on an event select an event of a channel, click right mouse button on the corresponding event tree node and select the menu item '''Add Context...''' from the context-sensitive menu.
1385 [[Image:images/LTTng2AddContextToEventsAction.png]]
1387 A new display will open for selecting one or more contexts to add. Select one or more contexts as described in chapter [[#Adding Contexts to Channels and Events of a Domain | Adding Contexts to Channels and Events of a Domain]]. Upon successful operation, the selected context will be added to the selected event.
1389 === Start Tracing ===
1391 To start tracing, select one or more sessions to start in the Control View and press the '''Start''' button. Alternatively, press the right mouse button on the session tree nodes. A context-sensitive menu will show. Then select the '''Start''' menu item.
1393 [[Image:images/LTTng2StartTracingAction.png]]
1395 Upon successful operation, the tracing session will be '''ACTIVE''' and the icon of the session will be updated.
1397 === Recording a Snapshot ===
1399 LTTng Tools version v2.3.0 introduces the possibility to create snapshot tracing sessions. After creating a snapshot session (see [[#Creating a Snapshot Tracing Session | Creating a Snapshot Tracing Session]]) and starting tracing (see [[#Start Tracing | Start Tracing]]) it possible to record snapshots. To record a snapshot select one or more sessions and press the '''Record Snapshot''' button. Alternatively, press the right mouse button on the session tree nodes. A context-sensitive menu will show. Then select the '''Recored Snapshot''' menu item.
1401 [[Image:images/LTTng2RecordSnapshotAction.png]]
1403 This action can be executed many times. It is possible to import the recorded snpshots to a tracing project. The trace session might be '''ACTIVE''' or '''INACTIVE''' for that. Refer to section [[#Importing Session Traces to a Tracing Project | Importing Session Traces to a Tracing Project]] on how to import a trace to a tracing project.
1405 === Stop Tracing ===
1407 To stop tracing, select one or more sessions to stop in the Control View and press the '''Stop''' button. Alternatively, click the right mouse button on the session tree node. A context-sensitive menu will show. Then select the '''Stop''' menu item.
1409 [[Image:images/LTTng2StopTracingAction.png]]
1411 Upon successful operation, the tracing session will be '''INACTIVE''' and the icon of the session will be updated.
1413 === Destroying a Tracing Session ===
1415 To destroy a tracing session, select one or more sessions to destroy in the Control View and press the '''Destroy''' button. Alternatively, click the right mouse button on the session tree node. A context-sensitive menu will show. Then select the '''Destroy...''' menu item. Note that the session has to be '''INACTIVE''' for this operation.
1417 [[Image:images/LTTng2DestroySessionAction.png]]
1419 A confirmation dialog box will open. Click on '''Ok''' to destroy the session otherwise click on '''Cancel'''.
1421 [[Image:images/LTTng2DestroyConfirmationDialog.png]]
1423 Upon successful operation, the tracing session will be destroyed and removed from the tree.
1425 === Refreshing the Node Information ===
1427 To refresh the remote host information, select any node in the tree of the Control View and press the '''Refresh''' button. Alternatively, click the right mouse button on any tree node. A context-sensitive menu will show. Then select the '''Refresh''' menu item.
1429 [[Image:images/LTTng2RefreshAction.png]]
1431 Upon successful operation, the tree in the Control View will be refreshed with the remote host configuration.
1433 === Quantifing LTTng overhead (Calibrate) ===
1435 The LTTng calibrate command can be used to find out the combined average overhead of the LTTng tracer and the instrumentation mechanisms used. For now, the only calibration implemented is that of the kernel function
1436 instrumentation (kretprobes). To run the calibrate command, select the a domain (e.g. '''Kernel'''), click the right mouse button on the domain tree node. A context-sensitive menu will show. Select the '''Calibrate''' menu item.
1438 [[Image:images/LTTng2CalibrateAction.png]]
1440 Upon successful operation, the calibrate command is executed and relevant information is stored in the trace. Note: that the trace has to be active so that to command as any effect.
1442 === Importing Session Traces to a Tracing Project ===
1444 To import traces from a tracing session, select the relevant session and click on the '''Import''' Button. Alternatively, click the right mouse button on the session tree node and select the menu item '''Import...''' from the context-sensitive menu.
1446 [[Image:images/LTTng2ImportAction.png]]
1448 A new display will open for selecting the traces to import.
1450 [[Image:images/LTTng2ImportDialog.png]]
1452 By default all traces are selected. A default project with the name '''Remote''' is selected which will be created if necessary. Update the list of traces to be imported, if necessary, by selecting and deselecting the relevant traces in the tree viewer. Use buttons '''Select All''' or '''Deselect All''' to select or deselect all traces. Also if needed, change the tracing project from the '''Available Projects''' combo box. Then press button '''Finish'''. Upon successful import operation the selected traces will be stored in the '''Traces''' directory of the specified tracing project. A directory with the connection name will be created under the '''Traces''' directory. Underneath that, the session directory structure as well as the trace names will be preserved in the destination tracing project. For '''Kernel''' traces the trace type '''Linux Kernel Trace''' and for '''UST''' traces the trace type '''LTTng UST Trace''' will be set. From the '''Project Explorer''' view, the trace can be analyzed further.
1454 '''Note''': If a trace already exists with the same name in the destination directory, the user can choose to rename the imported trace, overwrite the original trace or skip the trace. When rename is chosen, a number is appended to the trace name, for example kernel becomes kernel(2).
1456 [[Image:images/LTTng2ImportOverwriteConfirmationDialog.png]]
1458 If one selects '''Rename All''', '''Overwrite All''' or '''Skip All''' the choice will be applied for all traces with a name conflict.
1460 === Importing Network Traces to a Tracing Project ===
1462 Since LTTng Tools v2.1.0 it is possible to store traces over the network. To import network traces, execute the '''Import''' action as described in chapter [[#Importing Session Traces to a Tracing Project | Importing Session Traces to a Tracing Project]]. For network traces the '''Import Trace Wizard''' will be displayed. Follow the instructions in chapter [[#Importing | Importing]] to import the network traces of the current session.
1464 === Saving Tracing Sessions ===
1465 Since LTTng Tools v2.5.0 it is possible to save tracing sessions. The LTTng Tools command-line tool will save the sessions to XML files located by default in a subdirectory of the user's home directory. The Trace Compass '''Control''' view integration for this feature will also store this session profile file into the user's Trace Compass workspace. This will allow user's to re-use session profiles across remote nodes. To save one or more sessions, select the tree nodes of the relevant sessions and press the right mouse button. Then select the '''Save...''' entry of the context-sensitive menu.
1467 [[Image:images/LTTng2SaveAction.png]]
1469 A new display will open for saving the sessions.
1471 [[Image:images/LTTng2SaveDialog.png]]
1473 By default the '''force''' button is selected that will overwrite any conflicting session profile files on the remote node. Click on '''Ok''' to save the session(s) otherwise click on '''Cancel'''. Upon successful operation, the session profile files will be saved on the remote node and then will be downloaded to the user's Trace Compass workspace. In the case that a session XML file already exists in the workspace the user will be prompted to skip or overwrite the existing profile file.
1475 === Loading Tracing Sessions ===
1476 Since LTTng Tools v2.5.0 it is possible to load tracing sessions. The Trace Compass '''Control''' view integrations for this feature will allow to load session profiles that are located in the user's Trace Compass workspace, or alternatively, that are located on the remote node. In the first case the session profiles will be uploaded to the remote node before the load command is executed.
1478 To load one or more sessions, select the tree node '''Sessions''' and press the right mouse button. Then select the '''Load...''' entry of the context-sensitive menu.
1480 [[Image:images/LTTng2LoadAction.png]]
1482 A new display will open for loading session profiles.
1484 [[Image:images/LTTng2LoadDialog.png]]
1486 By default the '''Local''' button and '''force''' buttons are selected and session profile files of the user's workspace will be listed. Select one or more profiles, update the '''force''' button if needed and then click '''Ok'''. This will upload the session profile files to the remote node. If a session profile file already exist on the remote node, the user will be prompted to skip or overwrite the existing profile file. If skipped, the operation will be cancelled. If the '''force''' button is selected any existing session with a conflicting name will be destroyed and a new one will be created.
1488 Alternatively, one can select the '''Remote''' button to list all available session profile files on the remote node. To load one of the remote session profiles, select one or more profiles, update the '''force''' button if needed and then click '''Ok'''.
1490 [[Image:images/LTTng2LoadRemoteDialog.png]]
1492 Upon successful operation, the tracing sessions of the selected session profiles are created and added under the tree node '''Sessions''' the '''Control''' view.
1494 === Managing Tracing Session Profiles ===
1495 The '''LTTng Remote Profiles''' preference page is used to manage the list of LTTng session profiles that are stored in the user's Trace Compass workspace. To open the preference page, select the '''Manage...''' button of the '''Load Sessions''' dialog described in chapter [[#Loading Tracing Sessions |Loading Tracing Sessions]]. Alternatively, select '''Window -> Preferences''' from the top level menu and go to '''Tracing -> LTTng Remote Profiles'''.
1497 [[Image:images/LTTng2ManageSessionConfig.png]]
1499 The following actions can be performed from this dialog:
1503 Select one or more LTTng session profiles from the list and click the '''Delete''' button to remove the profile from the Trace Compass workspace. The user will be prompted to confirm the deletion.
1507 Click the '''Import...''' button and select a file from the opened file dialog to import a session profile file. If the file name conflicts with an existing profile file, the user will be prompted to skip or overwrite the existing profile file.
1510 Select one or more session profile files from the list, click the '''Export...''' button and enter or select a directory in the opened directory dialog to export the profile files. If the file name conflicts with an existing profile file in the destination directory, the user will be prompted to skip or overwrite the existing profile file.
1512 == Properties View ==
1514 The Control View provides property information of selected tree component. Depending on the selected tree component different properties are displayed in the property view. For example, when selecting the node level the property view will be filled as followed:
1516 [[Image:images/LTTng2PropertyView.png]]
1518 '''List of properties''':
1520 * '''Host''' Properties
1521 ** '''Connection Name''': The alias name to be displayed in the Control View.
1522 ** '''Host Name''': The IP address or DNS name of the remote system.
1523 ** '''State''': The state of the connection ('''CONNECTED''', '''CONNECTING''', '''DISCONNNECTING''' or '''DISCONNECTED''').
1524 * '''Kernel Provider''' Properties
1525 ** '''Provider Name''': The name of the provider.
1526 * '''UST Provider''' Properties
1527 ** '''Provider Name''': The name of the provider.
1528 ** '''Process ID''': The process ID of the provider.
1529 * '''Event''' Properties (Provider)
1530 ** '''Event Name''': The name of the event.
1531 ** '''Event Type''': The event type ('''TRACEPOINT''' only).
1532 ** '''Fields''': Shows a list of fields defined for the selected event. (UST only, since support for LTTng Tools v2.1.0)
1533 ** '''Log Level''': The log level of the event.
1534 * '''Session''' Properties
1535 ** '''Session Name''': The name of the Session.
1536 ** '''Session Path''': The path on the remote host where the traces will be stored. (Not shown for snapshot sessions).
1537 ** '''State''': The state of the session ('''ACTIVE''' or '''INACTIVE''')
1538 ** '''Snapshot ID''': The snapshot ID. (Only shown for snapshot sessions).
1539 ** '''Snapshot Name''': The name of the snapshot output configuration. (Only shown for snapshot sessions).
1540 ** '''Snapshot Path''': The path where the snapshot session is located. (Only shown for snapshot sessions).
1541 * '''Domain''' Properties
1542 ** '''Domain Name''': The name of the domain.
1543 ** '''Buffer Type''': The buffer type of the domain.
1544 * '''Channel''' Properties
1545 ** '''Channel Name''': The name of the channel.
1546 ** '''Number of Sub Buffers''': The number of sub-buffers of the channel.
1547 ** '''Output type''': The output type for the trace (e.g. ''splice()'' or ''mmap()'')
1548 ** '''Overwrite Mode''': The channel overwrite mode ('''true''' for overwrite mode, '''false''' for discard)
1549 ** '''Read Timer Interval''': The read timer interval.
1550 ** '''State''': The channel state ('''ENABLED''' or '''DISABLED''')
1551 ** '''Sub Buffer size''': The size of the sub-buffers of the channel (in bytes).
1552 ** '''Switch Timer Interval''': The switch timer interval.
1553 * '''Event''' Properties (Channel)
1554 ** '''Event Name''': The name of the event.
1555 ** '''Event Type''': The event type ('''TRACEPOINT''', '''SYSCALL''' or '''PROBE''').
1556 ** '''Log Level''': The log level of the event. (For LTTng Tools v2.4.0 or later, '''<=''' prior the log level name will indicate a range of log levels and '''==''' a single log level.)
1557 ** '''State''': The Event state ('''ENABLED''' or '''DISABLED''')
1558 ** '''Filter''': Shows '''with filter''' if a filter expression is configured else property '''Filter''' is omitted. (since support for LTTng Tools v2.1.0)
1560 == LTTng Tracer Control Preferences ==
1562 Several LTTng 2.0 tracer control preferences exists which can be configured. To configure these preferences, select '''Window -> Preferences''' from the top level menu. The preference display will open. Then select '''Tracing -> LTTng Tracer Control Preferences'''. This preferences page allows the user to specify the tracing group of the user and to specify the command execution timeout as well as it allows the user to configure the logging of LTTng 2.0 tracer control commands and results to a file.
1564 [[Image:images/LTTng2Preferences.png]]
1566 To change the tracing group of the user which will be specified on each command line, enter the new group name in the '''Tracing Group''' text field and click button '''OK'''. The default tracing group is '''tracing''' and can be restored by pressing the '''Restore Defaults''' button.
1568 [[Image:images/LTTng2PreferencesGroup.png]]
1570 To configure logging of trace control commands and the corresponding command result to a file, selected the button '''Logging'''. To append to an existing log file, select the '''Append''' button. Deselect the '''Append''' button to overwrite any existing log file. It's possible to specify a verbose level. There are 3 levels with inceasing verbosity from '''Level 1''' to '''Level 3'''. To change the verbosity level, select the relevant level or select '''None'''. If '''None''' is selected only commands and command results are logged. Then press on button '''OK'''. The log file will be stored in the users home directory with the name ''lttng_tracer_control.log''. The name and location cannot be changed. To reset to default preferences, click on the button '''Restore Defaults'''.
1572 [[Image:images/LTTng2PreferencesLogging.png]]
1574 To configure the LTTng command execution timeout, select '''Tracing -> Remote Connection Preferences''' and enter a timeout value into the text field '''Command Timeout (in seconds)'''. Then press on button '''OK'''. To reset to the default value of 15 seconds, click on the button '''Restore Defaults'''.
1576 [[Image:images/LTTng2PreferencesTimeout.png]]
1579 = LTTng Kernel Analysis =
1581 Historically, LTTng was developped to trace the Linux kernel and, over time, a number of kernel-oriented analysis views were developped and organized in a perspective.
1583 This section presents a description of the LTTng Kernel Perspective.
1585 == LTTng Kernel Perspective ==
1587 The '''LTTng Kernel''' perspective is built upon the [[#Tracing_Perspective | Tracing Perspective]], re-organizes them slightly and adds the following views:
1589 * [[#Control_Flow_View | Control Flow View]] - to visualize processes state transitions
1590 * [[#Resources_View | Resources View]] - to visualize system resources state transitions
1591 * [[#LTTng_Tracer_Control | LTTng Tracer Control]] - to configure LTTng tracing sessions remotely
1593 [[Image:images/LTTngKernelPerspective.png]]
1596 The perspective can be opened from the Eclipse Open Perspective dialog ('''Window > Open Perspective... > Other''').
1599 [[Image:images/OpenLTTngKernelPerspective.png]]
1601 == Control Flow View ==
1603 The '''''Control Flow''''' view is a LTTng-specific view that shows per-process events graphically. The Linux Kernel Analysis is executed the first time a LTTng Kernel is opened. After opening the trace, the element '''Control Flow''' is added under the '''Linux Kernel Analysis''' tree element in the Project Explorer. To open the view, double-click the '''Control Flow''' tree element.
1605 [[Image:images/Cfv_show_view.png]]
1607 Alternatively, select ''Control Flow'' under ''LTTng'' within the ''Show View'' window ('''Window''' -> '''Show View''' -> '''Other...'''):
1609 You should get something like this:
1611 [[Image:images/Cfv_global.png]]
1613 The view is divided into the following important sections: '''process tree and information''', '''control flow''' and the '''toolbar'''. The time axis is aligned with other views that support automatic time axis alignment (see [[#Automatic Time Axis Alignment | Automatic Time Axis Alignment]]).
1615 The following sections provide detailed information for each part of the Control Flow View.
1617 === Process tree and information ===
1619 Processes are organized as a tree within this view. This way, child and parent processes are easy to identify.
1621 [[Image:images/Cfv_process_tree.png]]
1623 The layout is based on the states computed from the trace events.
1625 A given process may be shown at different places within the tree since the nodes are '''unique (TID, birth time) couples'''. This means that if process B of parent A dies, you'll still see it in the tree. If process A forks process B again, it will be shown as a different node since it won't have the same birth time (and probably not the same TID). This has the advantage that the tree, once loaded, never changes: horizontal scrolling within the [[#Control flow|control flow]] remains possible.
1627 The TID column shows the process node's '''thread ID''' and the PTID column shows its '''parent thread ID''' (nothing is shown if the process has no parent).
1629 === Control flow ===
1631 This part of the Control Flow View is probably the most interesting one. Using the mouse, you can navigate through the trace (go left, right) and zoom on a specific region to inspect its details.
1633 The colored bars you see represent '''states''' for the associated process node. When a process state changes in time, so does the color. For state '''SYSCALL''' the name of the system call is displayed in the state bar. States colors legend is available through a [[#Toolbar|toolbar button]]:
1635 [[Image:images/Cfv_legend.png]]
1637 This dark yellow is what you'll see most of the time since scheduling puts processes on hold while others run.
1639 The vertical blue line with T1 above it is the '''current selection indicator'''. When a time range is selected, the region between the begin and end time of the selection will be shaded and two lines with T1 and T2 above will be displayed. The time stamps corresponding to T1, T2 and their delta are shown in the status line when the mouse is hovering over the control flow.
1641 Arrows can be displayed that follow the execution of each CPU across processes. The arrows indicate when the scheduler switches from one process to another for a given CPU. The CPU being followed is indicated on the state tooltip. When the scheduler switches to and from the idle process, the arrow skips to the next process which executes on the CPU after the idle process. Note that an appropriate zoom level is required for all arrows to be displayed.
1643 The display of arrows is optional and can be toggled using the '''Hide Arrows''' toolbar button. It is also possible to follow a CPU's execution across state changes and the scheduler's process switching using the '''Follow CPU Forward/Backward''' toolbar buttons.
1645 ==== Using the mouse ====
1647 The states flow is usable with the mouse. The following actions are set:
1649 * '''left-click''': select a time or time range begin time
1650 * '''Shift-left-click''': select a time range end time
1651 * '''left-drag horizontally''': select a time range or change the time range begin or end time
1652 * '''middle-drag or Ctrl-left-drag horizontally''': pan left or right
1653 * '''right-drag horizontally''': [[#Zoom region|zoom region]]
1654 * '''click on a colored bar''': the associated process node is selected and the current time indicator is moved where the click happened
1655 * '''mouse wheel up/down''': scroll up or down
1656 * '''Ctrl-mouse wheel up/down''': zoom in or out horizontally
1657 * '''Shift-Ctrl-mouse wheel up/down''': zoom in or out vertically
1658 * '''drag the time ruler horizontally''': zoom in or out with fixed start time
1659 * '''double-click the time ruler''': reset zoom to full range
1661 When the current time indicator is changed (when clicking in the states flow), all the other views are '''synchronized'''. For example, the [[#LTTng Kernel Events Editor|Events Editor]] will show the event matching the current time indicator. The reverse behaviour is also implemented: selecting an event within the Events View will update the Control Flow View current time indicator.
1663 ==== Using the keyboard ====
1665 The states flow is usable with the keyboard. The following actions are set:
1666 *'''arrow-right key''': selects the next state for the selected process
1667 *'''arrow-left key''': selects the previous state for the selected process
1668 *'''Shift + arrow-right key''': updates the selection end time of the current selection range by selecting the next state of the current process
1669 *'''Shift + arrow-left key''': updates the selection end time of the current selection range by selecting the previous state of the current process
1670 *'''.''': selects the next active marker
1671 *''',''': selects the previous active marker
1672 *'''Shift + .''': updates the selection end time of the current selection range by selecting the next active marker boundary
1673 *'''Shift + ,''': updates the selection end time of the current selection range by selecting the previous active marker boundary
1674 *'''arrow-down''': selects the next process
1675 *'''arrow-up''': selects the previous process
1676 *'''Page Down''': selects the process down one page
1677 *'''Page Up''': selects the process up one page
1678 *'''Home''': selects the first process
1679 *'''End''': selects the last process
1680 *'''Enter''': toggles the expansion state of the current process in the tree
1681 *'''+''': Zoom-in horizontally
1682 *'''-''': Zoom-out horizontally
1683 *'''Ctrl + +''': Zoom-in vertically
1684 *'''Ctrl + -''': Zoom-out vertically
1685 *'''Ctrl + 0''': Reset the vertical zoom
1687 When the selection indicators are changed, all the other views are '''synchronized'''. For example, the [[#LTTng Kernel Events Editor|Events Editor]] will show the event matching the current time indicator. The reverse behaviour is also implemented: selecting an event within the Events View will update the Control Flow View current time indicator.
1689 ==== Incomplete regions ====
1691 You'll notice '''small dots''' over the colored bars at some places:
1693 [[Image:images/Cfv_small_dots.png]]
1695 Those dots mean the underlying region is '''incomplete''': there's not enough pixels to view all the events. In other words, you have to zoom in.
1697 When zooming in, small dots start to disappear:
1699 [[Image:images/Cfv_zoom.png]]
1701 When no dots are left, you are viewing '''all the events and states''' within that region.
1703 ==== Zoom region ====
1705 To zoom in on a specific region, '''right-click and drag''' in order to draw a time range:
1707 [[Image:images/Cfv_zoom_region.png]]
1709 The states flow horizontal space will only show the selected region.
1713 Hover the cursor over a colored bar and a '''tooltip''' will pop up:
1715 [[Image:images/Cfv_tooltip.png]]
1717 The tooltip indicates:
1720 * the pointed state name
1721 * the CPU (if applicable)
1722 * the system call name (if applicable)
1723 * the pointed state date and start/stop times
1724 * the pointed state duration (seconds)
1728 <!-- Keep in sync with ref:resource-view-toolbar -->
1730 The Control Flow View '''toolbar''', located at the top right of the view, has shortcut buttons to perform common actions:
1733 | [[Image:images/link.gif]]
1735 | Disable and enable the automatic time axis alignment of time-based views. Disabling the alignment in this view will disable this feature across all the views because it's a workspace preference.
1737 | [[Image:images/filter_items.gif]]
1739 | Opens the process filter dialog.
1741 | [[Image:images/show_legend.gif]]
1743 | Displays the states legend.
1745 | [[Image:images/home_nav.gif]]
1746 | Reset the Time Scale to Default
1747 | Resets the zoom window to the full range.
1749 | [[Image:images/prev_event.gif]]
1750 | Select Previous Event
1751 | Selects the previous state for the selected process. Pressing the '''Shift''' key at the same time will update the selection end time of the current selection range.
1753 | [[Image:images/next_event.gif]]
1755 | Selects the next state for the selected process. Pressing the '''Shift''' key at the same time will update the selection end time of the current selection range.
1757 | [[Image:images/add_bookmark.gif]]
1759 | Adds a bookmark at the current selection range. A bookmark is a user-defined interval marker. The '''Add Bookmark''' dialog is opened where the user can enter a description and choose the highlighting color and alpha (transparency) value. This button is replaced by the '''Remove Bookmark''' button if the current selection range corresponds to an existing bookmark. The bookmarks can also be managed in the '''Bookmark View'''.
1761 | [[Image:images/remove_bookmark.gif]]
1763 | Removes the bookmark at the current selection range. This button replaces the '''Add Bookmark''' when the current selection range corresponds to an existing bookmark.
1765 | [[Image:images/prev_bookmark.gif]]
1767 | Selects the previous active marker. Pressing the '''Shift''' key at the same time will update the selection end time of the current selection range.
1769 | [[Image:images/next_bookmark.gif]]
1771 | Selects the next active marker. Pressing the '''Shift''' key at the same time will update the selection end time of the current selection range. Clicking the button drop-down arrow will open a menu where marker categories can be made active or inactive for navigation. To toggle the display of a marker category, use the '''View Menu''' instead.
1773 | [[Image:images/prev_menu.gif]]
1774 | Select Previous Process
1775 | Selects the previous process.
1777 | [[Image:images/next_menu.gif]]
1778 | Select Next Process
1779 | Selects the next process.
1781 | [[Image:images/zoomin_nav.gif]]
1783 | Zooms in on the selection by 50%.
1785 | [[Image:images/zoomout_nav.gif]]
1787 | Zooms out on the selection by 50%.
1789 | [[Image:images/hide_arrows.gif]]
1791 | Toggles the display of arrows on or off.
1793 | [[Image:images/follow_arrow_bwd.gif]]
1794 | Follow CPU Backward
1795 | Selects the previous state following CPU execution across processes. Pressing the '''Shift''' key at the same time will update the selection end time of the current selection range.
1797 | [[Image:images/follow_arrow_fwd.gif]]
1798 | Follow CPU Forward
1799 | Selects the next state following CPU execution across processes. Pressing the '''Shift''' key at the same time will update the selection end time of the current selection range.
1807 | A marker highlights a time interval. A marker can be used for instance to indicate a time range where lost event occurred or to bookmark an interesting interval for future reference. Selecting a category name will toggle the visibility of markers of that category.
1811 == Resources View ==
1813 This view is specific to LTTng kernel traces. The Linux Kernel Analysis is executed the first time a LTTng Kernel is opened. After opening the trace, the element '''Resources''' is added under the '''Linux Kernel Analysis''' tree element of the Project Explorer. To open the view, double-click the '''Resources''' tree element.
1815 Alternatively, go in '''Window''' -> '''Show View''' -> '''Other...''' and select '''LTTng/Resources''' in the list.
1817 [[Image:images/Rv_example.png|Example of resources view with all trace points and syscalls enabled]]
1819 This view shows the state of system resources i.e. if changes occurred during the trace either on '''CPUs''', '''IRQs''' or '''soft IRQs''', it will appear in this view. The left side of the view present a list of resources that are affected by at least one event of the trace. The right side illustrate the state in which each resource is at some point in time. For state '''USERMODE''' it also prints the process name in the state bar. For state '''SYSCALL''' the name of the system call is
1820 displayed in the state region.
1822 Just like other views, according to which trace points and system calls are activated, the content of this view may change from one trace to another.
1824 The time axis is aligned with other views that support automatic time axis alignment (see [[#Automatic Time Axis Alignment | Automatic Time Axis Alignment]]).
1826 Each state are represented by one color so it is faster to say what is happening.
1828 [[Image:images/Rv_legend.png|Color for each state]]
1830 To go through the state of a resource, you first have to select the resource and the timestamp that interest you. For the latter, you can pick some time before the interesting part of the trace.
1832 [[Image:images/RV_infobox1.png|Shows the state of an IRQ]]
1834 Then, by selecting '''Next Event''', it will show the next state transition and the event that occurred at this time.
1836 [[Image:images/RV_infobox2.png|Shows the next state of the IRQ]]
1838 This view is also synchronized with the others : [[#Histogram_View | Histogram View]], [[#LTTng_Kernel_Events_Editor | Events Editor]], [[#Control_Flow_View | Control Flow View]], etc.
1842 See Control Flow View's '''[[#Using_the_mouse | Using the mouse]]''', '''[[#Using_the_keyboard | Using the keyboard]]''' and '''[[#Zoom_region | Zoom region]]'''.
1844 === Incomplete regions ===
1846 See Control Flow View's '''[[#Incomplete_regions | Incomplete regions]]'''.
1850 <!-- ref:resource-view-toolbar -->
1852 The Resources View '''toolbar''', located at the top right of the view, has shortcut buttons to perform common actions:
1855 | [[Image:images/link.gif]]
1857 | Disable and enable the automatic time axis alignment of time-based views. Disabling the alignment in this view will disable this feature across all the views because it's a workspace preference.
1859 | [[Image:images/filter_items.gif]]
1861 | Opens the process filter dialog.
1863 | [[Image:images/show_legend.gif]]
1865 | Displays the states legend.
1867 | [[Image:images/home_nav.gif]]
1868 | Reset the Time Scale to Default
1869 | Resets the zoom window to the full range.
1871 | [[Image:images/prev_event.gif]]
1872 | Select Previous Event
1873 | Selects the previous state for the selected resource. Pressing the '''Shift''' key at the same time will update the selection end time of the current selection range.
1875 | [[Image:images/next_event.gif]]
1877 | Selects the next state for the selected resource. Pressing the '''Shift''' key at the same time will update the selection end time of the current selection range.
1879 | [[Image:images/add_bookmark.gif]]
1881 | Adds a bookmark at the current selection range. A bookmark is a user-defined interval marker. The '''Add Bookmark''' dialog is opened where the user can enter a description and choose the highlighting color and alpha (transparency) value. This button is replaced by the '''Remove Bookmark''' button if the current selection range corresponds to an existing bookmark. The bookmarks can also be managed in the '''Bookmark View'''.
1883 | [[Image:images/remove_bookmark.gif]]
1885 | Removes the bookmark at the current selection range. This button replaces the '''Add Bookmark''' when the current selection range corresponds to an existing bookmark.
1887 | [[Image:images/prev_bookmark.gif]]
1889 | Selects the previous active marker. Pressing the '''Shift''' key at the same time will update the selection end time of the current selection range.
1891 | [[Image:images/next_bookmark.gif]]
1893 | Selects the next active marker. Pressing the '''Shift''' key at the same time will update the selection end time of the current selection range. Clicking the button drop-down arrow will open a menu where marker categories can be made active or inactive for navigation.
1895 | [[Image:images/prev_menu.gif]]
1896 | Select Previous Resource
1897 | Selects the previous resource
1899 | [[Image:images/next_menu.gif]]
1900 | Select Next Resource
1901 | Selects the next resource
1903 | [[Image:images/zoomin_nav.gif]]
1905 | Zooms in on the selection by 50%.
1907 | [[Image:images/zoomout_nav.gif]]
1909 | Zooms out on the selection by 50%.
1911 | [[Image:images/hide_arrows.gif]]
1913 | Toggles the display of arrows on or off.
1915 | [[Image:images/follow_arrow_bwd.gif]]
1916 | Follow CPU Backward
1917 | Selects the previous state following CPU execution across processes. Pressing the '''Shift''' key at the same time will update the selection end time of the current selection range.
1919 | [[Image:images/follow_arrow_fwd.gif]]
1920 | Follow CPU Forward
1921 | Selects the next state following CPU execution across processes. Pressing the '''Shift''' key at the same time will update the selection end time of the current selection range.
1929 | A marker highlights a time interval. A marker can be used for instance to indicate a time range where lost event occurred or to bookmark an interesting interval for future reference. Selecting a category name will toggle the visibility of markers of that category.
1933 == LTTng CPU Usage View ==
1935 The CPU Usage analysis and view is specific to LTTng Kernel traces. The CPU usage is derived from a kernel trace as long as the '''sched_switch''' event was enabled during the collection of the trace. This analysis is executed the first time that the CPU Usage view is opened after opening the trace. To open the view, double-click on the '''CPU Usage''' tree element under the '''Linux Kernel Analysis''' tree element of the Project Explorer.
1937 [[Image:images/LTTng_OpenCpuUsageView.png]]
1939 Now, the CPU Usage view will show:
1941 [[Image:images/LTTng_CpuUsageView.png]]
1943 The view is divided into the following important sections: '''Process Information''' and the '''CPU Usage Chart'''. The time axis is aligned with other views that support automatic time axis alignment (see [[#Automatic Time Axis Alignment | Automatic Time Axis Alignment]]).
1946 === Process Information ===
1947 The Process Information is displayed on the left side of the view and shows all threads that were executing on all available CPUs in the current time range. For each process, it shows in different columns the thread ID (TID), process name (Process), the average (%) execution time and the actual execution time (Time) during the current time range. It shows all threads that were executing on the CPUs in the current time range.
1950 === CPU Usage Chart ===
1952 The CPU Usage Chart on the right side of the view, plots the total time spent on all CPUs of all processes and the time of the selected process.
1955 ==== Using the mouse ====
1957 The CPU Usage chart is usable with the mouse. The following actions are set:
1959 * '''left-click''': select a time or time range begin time
1960 * '''left-drag horizontally''': select a time range or change the time range begin or end time
1961 * '''middle-drag''': pan left or right
1962 * '''right-drag horizontally''': zoom region
1963 * '''mouse wheel up/down''': zoom in or out
1968 Hover the cursor over a line of the chart and a tooltip will pop up with the following information:
1969 * '''time''': current time of mouse position
1970 * '''Total''': The total CPU usage
1975 The CPU Usage View '''toolbar''', located at the top right of the view, has shortcut buttons to perform common actions:
1978 | [[Image:images/link.gif]]
1980 | Disable and enable the automatic time axis alignment of time-based views. Disabling the alignment in the this view will disable this feature across all the views because it's a workspace preference
1984 [[Image:images/LTTng_CpuUsageViewToolTip.png]]
1986 == LTTng Kernel Events Editor ==
1988 The LTTng Kernel Events editor '''is''' the plain TMF [[#Events_Editor | Events Editor]], except that it provides its own specialized viewer to replace the standard one. In short, it has exactly the same behaviour but the layout is slightly different:
1990 * '''Timestamp''': the event timestamp
1991 * '''Channel''': the event channel (data collector)
1992 * '''CPU''': the CPU on which the event was taken
1993 * '''Event Type''': the event type (or kernel marker)
1994 * '''Contents''': the fields (or payload) of this event
1995 * '''TID''': The ID of the thread this event belongs to
1996 * '''Prio''': The priority of the thread this event belongs to
1998 [[Image:images/LTTng2EventsEditor.png]]
2000 = LTTng-UST Analyses =
2002 The Userspace traces are taken on an application level. With kernel traces, you know what events you will have as the domain is known and cloistered. Userspace traces can contain pretty much anything. Some analyses are offered if certain events are enabled.
2004 == Call Stack View ==
2006 The Call Stack view allows the user to visualize the call stack per thread over time, if the application and trace provide this information.
2008 To open this view go in '''Window''' -> '''Show View''' -> '''Other...''' and select '''Tracing/Call Stack''' in the list. The view shows the call stack information for the currently selected trace. Conversely, you can select a trace and expand it in the '''Project Explorer''' then expand '''LTTng-UST CallStack Analysis''' (the trace must be loaded) and open '''Call Stack'''.
2010 The table on the left-hand side of the view shows the threads and call stack. The function name, depth, entry and exit time and duration are shown for the call stack at the selected time.
2012 Double-clicking on a function entry in the table will zoom the time graph to the selected function's range of execution.
2014 The time graph on the right-hand side of the view shows the call stack state graphically over time. The function name is visible on each call stack event if size permits. The color of each call stack event is randomly assigned based on the function name, allowing for easy identification of repeated calls to the same function.
2016 Clicking on the time graph will set the current time and consequently update the table with the current call stack information.
2018 Shift-clicking on the time graph will select a time range. When the selection is a time range, the begin time is used to update the stack information.
2020 Double-clicking on a call stack event will zoom the time graph to the selected function's range of execution.
2022 Clicking the '''Select Next Event''' or '''Select Previous Event''' or using the left and right arrows will navigate to the next or previous call stack event, and select the function currently at the top of the call stack. Note that pressing the '''Shift''' key at the same time will update the selection end time of the current selection.
2024 Clicking the '''Import Mapping File''' ([[Image:images/import.gif]]) icon will open a file selection dialog, allowing you to import a text file containing mappings from function addresses to function names. If the callstack provider for the current trace type only provides function addresses, a mapping file will be required to get the function names in the view. See the following sections for an example with LTTng-UST traces.
2026 === Using the Callstack View with LTTng-UST traces ===
2028 There is support in the LTTng-UST integration plugin to display the callstack of applications traced with the ''liblttng-ust-cyg-profile.so'' library (see the ''liblttng-ust-cyg-profile'' man page for additional information). To do so, you need to:
2030 * Recompile your application with "''-g -finstrument-functions''".
2031 * Add the ''vtid'' and ''procname'' contexts to your trace session. See the [[#Adding Contexts to Channels and Events of a Domain]] section. Or if using the command-line:
2032 ** <pre>lttng add-context -u -t vtid -t procname</pre>
2033 * Preload the ''liblttng-ust-cyg-profile'' library when running your program:
2034 ** <pre>LD_PRELOAD=/usr/lib/liblttng-ust-cyg-profile.so ./myprogram</pre>
2036 Once you load the resulting trace, making sure it's set to the ''Common Trace Format - LTTng UST Trace'' type, the Callstack View should be populated with the relevant information. However, since GCC's cyg-profile instrumentation only provides function addresses, and not names, an additional step is required to get the function names showing in the view. The following section explains how to do so.
2038 === Importing a function name mapping file for LTTng-UST traces ===
2040 If you followed the steps in the previous section, you should have a Callstack View populated with function entries and exits. However, the view will display the function addresses instead of names in the intervals, which are not very useful by themselves. To get the actual function names, you need to:
2042 * Generate a mapping file from the binary, using:
2043 ** <pre>nm myprogram > mapping.txt</pre>
2044 * Click the '''Import Mapping File''' ([[Image:images/import.gif]]) button in the Callstack View, and select the ''mapping.txt'' file that was just created.
2046 (If you are dealing with C++ executables, you may want to use ''nm --demangle'' instead to get readable function names.)
2048 The view should now update to display the function names instead. Make sure the binary used for taking the trace is the one used for this step too (otherwise, there is a good chance of the addresses not being the same).
2052 The Memory Usage view allows the user to visualize the active memory usage per thread over time, if the application and trace provide this information.
2054 The view shows the memory consumption for the currently selected trace.
2056 The time chart plots heap memory usage graphically over time. There is one line per process, unassigned memory usage is mapped to "Other".
2058 In this implementation, the user needs to trace while hooking the ''liblttng-ust-libc-wrapper'' by running ''LD_PRELOAD=liblttng-ust-libc-wrapper.so'' '''<exename>'''. This will add tracepoints to memory allocation and freeing to the heap, NOT shared memory or stack usage. If the contexts '''vtid''' and '''procname''' are enabled, then the view will associate the heap usage to processes. As detailed earlier, to enable the contexts, see the [[#Adding Contexts to Channels and Events of a Domain]] section. Or if using the command-line:
2059 * <pre>lttng add-context -u -t vtid -t procname</pre>
2061 If thread information is available the view will look like this:
2063 [[Image:images/memoryUsage/memory-usage-multithread.png]]
2065 If thread information is not available it will look like this:
2067 [[Image:images/memoryUsage/memory-usage-no-thread-info.png]]
2069 The time axis is aligned with other views that support automatic time axis alignment (see [[#Automatic Time Axis Alignment | Automatic Time Axis Alignment]]).
2071 Please note this view will not show shared memory or stack memory usage.
2073 === Using the mouse ===
2075 The Memory Usage chart is usable with the mouse. The following actions are set:
2077 * '''left-click''': select a time or time range begin time
2078 * '''left-drag horizontally''': select a time range or change the time range begin or end time
2079 * '''middle-drag''': pan left or right
2080 * '''right-drag horizontally''': zoom region
2081 * '''mouse wheel up/down''': zoom in or out
2086 The Memory Usage View '''toolbar''', located at the top right of the view, has shortcut buttons to perform common actions:
2089 | [[Image:images/link.gif]]
2091 | Disable and enable the automatic time axis alignment of time-based views. Disabling the alignment in the this view will disable this feature across all the views because it's a workspace preference
2095 [[Image:images/LTTng_CpuUsageViewToolTip.png]]
2097 Please note this view will not show shared memory or stack memory usage.
2099 = Trace synchronization =
2101 It is possible to synchronize traces from different machines so that they have the same time reference. Events from the reference trace will have the same timestamps as usual, but the events from traces synchronized with the first one will have their timestamps transformed according to the formula obtained after synchronization.
2103 == Obtain synchronizable traces ==
2105 To synchronize traces from different machines, they need to exchange packets through the network and have events enabled such that the data can be matched from one trace to the other. For now, only TCP packets can be matched between two traces.
2107 LTTng traces that can be synchronized are obtained using one of two methods (both methods are compatible):
2109 === LTTng-module network tracepoint with complete data ===
2111 The tracepoints '''net_dev_queue''' and '''netif_receive_skb''' will be used for synchronization. Both tracepoints are available in lttng-modules since version 2.2, but they do not contain sufficient data to be used to synchronize traces.
2113 An experimental branch introduces this extra data: lttng-modules will need to be compiled by hand.
2115 Obtain the source code for the experimental lttng-modules
2117 # git clone git://git.dorsal.polymtl.ca/~gbastien/lttng-modules.git
2120 Checkout the ''net_data_experimental'' branch, compile and install lttng-modules as per the lttng-modules documentation
2122 # git checkout net_data_experimental
2124 # sudo make modules_install
2127 This experimental branch adds IP, IPv6 and TCP header data to the tracepoints. Packets received and sent with other protocols do not have this extra header data, but all packets are captured.
2129 === LTTng-modules addons kernel module with dynamic tracepoints ===
2131 This method adds dynamic instrumentation on TCP packets via extra kernel modules. Only TCP packets are captured.
2133 Obtain the source code, along with lttng-modules
2135 # git clone https://github.com/giraldeau/lttng-modules.git
2138 Checkout the addons branch, compile and install lttng-modules as per the lttng-modules documentation. The ''make'' command will fail at first with a message about the unset SYSMAP variable. Instructions on how to generate a System.map are mentioned in the error message.
2140 # git checkout addons
2142 # (follow the instructions to obtain the System.map file and set the SYSMAP variable)
2144 # sudo make modules_install
2147 The lttng-addons modules must be inserted manually for the TCP tracepoints to be made available.
2149 # sudo modprobe lttng-addons
2150 # sudo modprobe lttng-probe-addons
2152 The following tracepoints will be available
2154 # sudo lttng list -k
2158 inet_sock_create (loglevel: TRACE_EMERG (0)) (type: tracepoint)
2159 inet_sock_delete (loglevel: TRACE_EMERG (0)) (type: tracepoint)
2160 inet_sock_clone (loglevel: TRACE_EMERG (0)) (type: tracepoint)
2161 inet_accept (loglevel: TRACE_EMERG (0)) (type: tracepoint)
2162 inet_connect (loglevel: TRACE_EMERG (0)) (type: tracepoint)
2163 inet_sock_local_in (loglevel: TRACE_EMERG (0)) (type: tracepoint)
2164 inet_sock_local_out (loglevel: TRACE_EMERG (0)) (type: tracepoint)
2167 The ones used for trace synchronization are '''inet_sock_local_in''' and '''inet_sock_local_out'''.
2169 == Synchronize traces in Trace Compass ==
2171 In order to synchronize traces, create a new experiment and select all traces that need to be synchronized. Right-click on the experiment and select '''Synchronize traces'''. For each trace whose time needs to be transformed, a new trace named as the original but followed by a '_' will be created with the transformed timestamps, and the original trace will be replaced in the experiment. The original trace can still be accessed under the '''Traces''' folder.
2173 [[Image:images/Sync_menu.png|Right-click synchronize traces to perform the trace synchronization]]
2175 When opening the experiment now, all the views will be synchronized. The following screenshot presents the differences in the filtered Control Flow View before and after the time synchronization.
2177 [[Image:images/Sync_cfv.png|Example of Control Flow View before and after trace synchronization]]
2179 Information on the quality of the synchronization, the timestamp transformation formula and some synchronization statistics can be visualized in the '''Synchronization''' view. To open the '''Synchronization''' view, use the Eclipse Show View dialog ('''Window''' -> '''Show View''' -> '''Other...'''). Then select '''Synchronization''' under '''Tracing'''.
2181 [[Image:images/Sync_view.png|Example of Synchronization view]]
2185 The time offsetting feature allows the user to apply a fixed offset to all event timestamps in a trace. It can be used, for example, to adjust the start time of a trace, or to manually align the timestamp of events from different traces.
2189 If the time offset to apply is known, it can be applied directly to the trace. In the '''Project Explorer''' view, select a trace, right-click and select '''Apply Time Offset...'''. It is also possible to select multiple traces, experiments or trace folders. All contained traces will be selected.
2191 [[Image:images/TimeOffsetApply.png|Apply Time Offset menu]]
2193 The dialog opens, in '''Basic''' mode.
2195 [[Image:images/TimeOffsetBasicDialog.png|Apply Time Offset dialog - Basic mode]]
2197 Enter a time offset to apply in the '''Offset in seconds''' column, with or without decimals. Then press the '''OK''' button.
2199 [[Image:images/TimeOffsetBasicDialogFilled.png|Apply Time Offset dialog - Basic mode - filled]]
2201 The time offset is applied to the trace and can be seen in the '''time offset''' property in the '''Properties''' view when the trace is selected.
2203 The applied time offset is added to any time offset or time transformation formula currently set for the trace, and the resulting offset replaces any previous setting.
2207 The time offset can also be computed using selected trace events or manually entered timestamps. After selecting one or more traces in the '''Project Explorer''' view, right-click and select '''Apply Time Offset...'''. In the opened dialog, select the '''Advanced''' button.
2209 [[Image:images/TimeOffsetAdvancedDialog.png|Apply Time Offset dialog - Advanced mode]]
2211 Double-clicking a trace name will open the trace in an editor. The '''Reference Time''' will be set to the trace start time. Selecting any event in the trace editor will set the '''Reference Time''' for that trace to the event's timestamp.
2213 Selecting an event or a time in any view or editor that supports time synchronization will set the '''Target Time''' for every trace in the dialog.
2215 Pressing the '''<<''' button will compute the time offset that should be applied in order to make the reference time align to the target time, provided that both fields are set.
2217 The '''Reference Time''', '''Target Time''' and '''Offset in seconds''' fields can also be edited and entered manually.
2219 To synchronize two events from different traces, first select an event in the trace to which the time offset should be applied, which will set its '''Reference Time''' field.
2221 [[Image:images/TimeOffsetAdvancedSetReference.png|Apply Time Offset dialog - Set Reference Time]]
2223 Then select a corresponding event in the second trace, which will set the '''Target Time''' field for the first trace.
2225 [[Image:images/TimeOffsetAdvancedSetTarget.png|Apply Time Offset dialog - Set Target Time]]
2227 Finally, press the '''<<''' button, which will automatically compute the time offset that should be applied in order to make the first event's timestamp align to the second event's timestamp.
2229 [[Image:images/TimeOffsetAdvancedComputeOffset.png|Apply Time Offset dialog - Compute Offset]]
2231 Then press the '''OK''' button. The time offset is applied to the trace and can be seen in the '''time offset''' property in the '''Properties''' view when the trace is selected.
2233 The applied time offset is added to any time offset or time transformation formula currently set for the trace, and the resulting offset replaces any previous setting.
2235 [[Image:images/TimeOffsetProperty.png|Time Offset - Properties view]]
2237 == Clearing time offset ==
2239 The time offset previously applied can be cleared to reset the trace to its original timestamps. In the '''Project Explorer''' view, select a trace, right-click and select '''Clear Time Offset'''. It is also possible to select multiple traces, experiments or trace folders. All contained traces will be affected.
2241 The time offset or any time transformation formula will be deleted.
2243 = Timestamp formatting =
2245 Most views that show timestamps are displayed in the same time format. The unified timestamp format can be changed in the Preferences page. To get to that page, click on '''Window''' -> '''Preferences''' -> '''Tracing''' -> '''Time Format'''. Then a window will show the time format preferences.
2247 [[Image:images/TmfTimestampFormatPage.png]]
2249 The preference page has several subsections:
2251 * '''Current Format''' a format string generated by the page
2252 * '''Sample Display''' an example of a timestamp formatted with the '''Current Format''' string.
2253 * '''Time Zone''' the time zone to use when displaying the time. The value '''Local time''' corresponds to the local, system-configured, time zone.
2254 * '''Data and Time format''' how to format the date (days/months/years) and the time (hours/minutes/seconds)
2255 * '''Sub-second format''' how much precision is shown for the sub-second units
2256 * '''Date delimiter''' the character used to delimit the date units such as months and years
2257 * '''Time delimiter''' the character to separate super-second time units such as seconds and minutes
2258 * '''Sub-Second Delimiter''' the character to separate the sub-second groups such as milliseconds and nanoseconds
2259 * '''Restore Defaults''' restores the system settings
2260 * '''Apply''' apply changes
2262 This will update all the displayed timestamps.
2264 = Data driven analysis =
2266 It is possible to define custom trace analyses and a way to view them in an XML format. These kind of analyses allow doing more with the trace data than what the default analyses shipped with TMF offer. It can be customized to a specific problem, and fine-tuned to show exactly what you're looking for.
2268 == Importing an XML file containing analysis ==
2270 If you already have an XML file defining state providers and/or views, you can import it in your TMF workspace by right-clicking on the ''Traces'' or ''Experiments'' folder and selecting ''Import XML Analysis''.
2272 [[Image:images/import_XML_analysis.png| Import XML analysis menu]]
2274 You will be prompted to select the file. It will be validated before importing it and if successful, the new analysis and views will be shown under the traces for which they apply. You will need to close any already opened traces and re-open them before the new analysis can be executed.
2276 Right now, there is no way to "unimport" analyses from within the application. A UI to manage the imported analyses is currently being worked on. In the meantime, you can navigate to your workspace directory, and delete the files in .metadata/.plugins/org.eclipse.tracecompass.tmf.analysis.xml.core/xml_files .
2278 == Defining XML components ==
2280 To define XML components, you need to create a new XML file and use the XSD that comes with the XML plugin.
2282 ''For now, the XSD is only available through the source code in org.eclipse.tracecompass.tmf.analysis.xml.core/src/org/eclipse/tracecompass/tmf/analysis/xml/core/module/xmlDefinition.xsd''.
2284 An empty file, with no content yet would look like this:
2287 <?xml version="1.0" encoding="UTF-8"?>
2288 <tmfxml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
2289 xsi:noNamespaceSchemaLocation="xmlDefinition.xsd">
2294 == Defining an XML state provider ==
2296 The state system is a component of TMF which can track the states of different elements of the system over the duration of a trace. To build this state system, events have to go chronologically through a state provider, which defines what changes are caused by the event to the system.
2298 The state system obtained by the state provider can then be used to populate data-driven views without having to re-read the trace, or to query specific timestamps in the trace without needing to access the trace file.
2300 === Definitions and example ===
2302 Before we start, we'll define a few terms used in the following sections. The interested reader should read the [https://wiki.eclipse.org/index.php/Trace_Compass#User_Guides Tmf Developer Guide] for more complete description of the state system and state providers.
2304 * The '''state system''' can be viewed as a model of the system, where the different elements (attributes) can be seen as a tree, and their evolution (states) is tracked through time.
2306 * '''Attribute''': An attribute is the smallest element of the model that can be in any particular state. Since many attributes may have the same name, each attribute is represented by its full path in the attribute tree.
2308 * '''State''': A state is a value assigned to an attribute at a given time. Each model has its own state values.
2310 * '''Attribute tree''': Elements in the model can be placed in a tree-like structure, for logical grouping. Each element in the tree can have both children and a state. Also, the tree is just a logical structure, all elements may be top-level elements.
2312 * '''State history''': Whereas the attribute tree may be seen as the first dimension of the state system, the state history is the second dimension, over time. It tracks the intervals at which an attribute was in a given state.
2314 In the following sections, we'll use an example trace with the following events:
2316 * start(number): A new task with ID 'number' just started.
2317 * execute(number, fct_name): The task with ID 'number' is executing a critical section named 'fct_name'.
2318 * wait(number): The task with ID 'number' cannot execute a critical section and needs to wait for it.
2319 * exec_end(fct_name): A task finished executing the critical section named 'fct_name'.
2320 * stop(number): The task with ID 'number' has just finished.
2322 === Determining the state system structure ===
2324 The first thing to do is to determine the attribute tree we'll use to represent the model of the system. The attribute tree is like a file system with directories and files, where files are logically gathered in the same parent directory. There is no one good way to build a tree, the logic will depend on the situation and on the person defining it.
2326 The generated state system may be used later on to populate views, so attributes of the tree could be grouped in such a way as to make it easy to reach them with a simple path. The view will then be more simple.
2328 In our example case, we'll want to track the status of each task and, for each critical section, which task is running them.
2341 Then we determine how each event will affect the state of the attributes. But first, let's ask ourselves what values should each state take.
2343 Let's see with the tree:
2347 | |- 1 -> Each task can be in one of
2348 | |- 2 RUNNING, CRITICAL, WAITING
2350 |- Critical section -> Empty
2351 |- Crit_sect1 -> Each critical section will hold the currently running task number
2356 Then we determine how each event will affect the state of the attributes. In the attribute paths below, elements in {} are values coming from the trace event, while strings are constants. For the sake of simplicity, we'll say "update attribute", but if an attribute does not exist, it will be created.
2358 * start(number): Update state value of attribute "Tasks/{number}" to "RUNNING".
2359 * execute(number, fct_name): Update state value of attribute "Tasks/{number}" to "CRITICAL" and Update attribute "Critical section/{fct_name}" to "{number}".
2360 * wait(number): Update state value of attribute "Tasks/{number}" to "WAITING".
2361 * exec_end(fct_name): Update state value of attribute "Tasks/{valueOf Critical section/{fct_name}}" to RUNNING and update "Critical section/{fct_name}" to null.
2362 * stop(number): Update state value of attribute "Tasks/{number}" to null.
2364 === Writing the XML state provider ===
2366 Once the model is done at a high level, it is time to translate it to an XML data-driven analysis. For details on how to use each XML element, refer to the documentation available in the XSD files. Some elements will be commented on below.
2368 First define the state provider element.
2370 The "version" attribute indicates which version of the state system is defined here. Once a state provider has been defined for a trace type, it will typically be used by a team of people and it may be modified over time. This version number should be bumped each time a new version of the state provider is published. This will force a rebuild of any existing state histories (if applicable) whose version number is different from the current one.
2372 The "id" attribute uniquely identifies this state provider, and the analysis that will contain it.
2375 <stateProvider version="0" id="my.test.state.provider">
2378 Optional header information can be added to the state provider. A "traceType" should be defined to tell TMF which trace type this analysis will apply to. If no tracetype is specified, the analysis will appear under every trace. A "label" can optionally be added to have a more user-friendly name for the analysis.
2382 <traceType id="my.trace.id" />
2383 <label value="My test analysis" />
2387 If pre-defined values will be used in the state provider, they must be defined before the state providers. They can then be referred to in the state changes by name, preceded by the '$' sign. It is not necessary to use pre-defined values, the state change can use values like (100, 101, 102) directly.
2390 <definedValue name="RUNNING" value="100" />
2391 <definedValue name="CRITICAL" value="101" />
2392 <definedValue name="WAITING" value="102" />
2395 The following event handler shows what to do with the event named ''start''. It causes one state change. The sequence of '''stateAttribute''' elements represents the path to the attribute in the attribute tree, each element being one level of the tree. The '''stateValue''' indicates which value to assign to the attribute at the given path. The "$RUNNING" value means it will use the predefined value named RUNNING above.
2397 Suppose the actual event is ''start(3)''. The result of this state change is that at the time of the event, the state system attribute "Tasks/3" will have value 100.
2400 <eventHandler eventName="start">
2402 <stateAttribute type="constant" value="Tasks" />
2403 <stateAttribute type="eventField" value="number" />
2404 <stateValue type="int" value="$RUNNING" />
2409 The full XML file for the example above would look like this:
2412 <?xml version="1.0" encoding="UTF-8"?>
2413 <tmfxml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../org.eclipse.tracecompass.tmf.analysis.xml.core/src/org/eclipse/tracecompass/tmf/analysis/xml/core/module/xmlDefinition.xsd">
2414 <stateProvider version="0" id="my.test.state.provider">
2416 <traceType id="my.trace.id" />
2417 <label value="My test analysis" />
2420 <definedValue name="RUNNING" value="100" />
2421 <definedValue name="CRITICAL" value="101" />
2422 <definedValue name="WAITING" value="102" />
2424 <eventHandler eventName="start">
2426 <stateAttribute type="constant" value="Tasks" />
2427 <stateAttribute type="eventField" value="number" />
2428 <stateValue type="int" value="$RUNNING" />
2431 <eventHandler eventName="execute">
2433 <stateAttribute type="constant" value="Tasks" />
2434 <stateAttribute type="eventField" value="number" />
2435 <stateValue type="int" value="$CRITICAL" />
2438 <stateAttribute type="constant" value="Critical section" />
2439 <stateAttribute type="eventField" value="fct_name" />
2440 <stateValue type="eventField" value="number" />
2443 <eventHandler eventName="wait">
2445 <stateAttribute type="constant" value="Tasks" />
2446 <stateAttribute type="eventField" value="number" />
2447 <stateValue type="int" value="$WAITING" />
2450 <eventHandler eventName="exec_end">
2452 <stateAttribute type="constant" value="Tasks" />
2453 <stateAttribute type="query">
2454 <stateAttribute type="constant" value="Critical section" />
2455 <stateAttribute type="eventField" value="fct_name" />
2457 <stateValue type="int" value="$RUNNING" />
2460 <stateAttribute type="constant" value="Critical section" />
2461 <stateAttribute type="eventField" value="fct_name" />
2462 <stateValue type="null" />
2465 <eventHandler eventName="stop">
2467 <stateAttribute type="constant" value="Tasks" />
2468 <stateAttribute type="eventField" value="number" />
2469 <stateValue type="null" />
2476 === Debugging the XML state provider ===
2478 To debug the state system that was generated by the XML state provider, one could use the [[#State System Explorer View | State System Explorer View]], along with the events editor. By selecting an event, you can see what changes this event caused and the states of other attributes at the time.
2480 If there are corrections to make, you may modify the XML state provider file, and re-import it. To re-run the analysis, you must first delete the supplementary files by right-clicking on your trace, and selecting ''Delete supplementary files...''. Check you analysis's .ht file, so that the analysis will be run again when the trace is reopened. The supplementary file deletion will have closed the trace, so it needs to be opened again to use the newly imported analysis file.
2482 If modifications are made to the XML state provider after it has been "published", the '''version''' attribute of the '''xmlStateProvider''' element should be updated. This avoids having to delete each trace's supplementary file manually. If the saved state system used a previous version, it will automatically be rebuilt from the XML file.
2484 == Defining an XML time graph view ==
2486 A time graph view is a view divided in two, with a tree viewer on the left showing information on the different entries to display and a Gantt-like viewer on the right, showing the state of the entries over time. The [[#Control_Flow_View | Control Flow View]] is an example of a time graph view.
2488 Such views can be defined in XML using the data in the state system. The state system itself could have been built by an XML-defined state provider or by any pre-defined Java analysis. It only requires knowing the structure of the state system, which can be explored using the [[#State System Explorer View | State System Explorer View]] (or programmatically using the methods in ''ITmfStateSystem'').
2490 In the example above, suppose we want to display the status for each task. In the state system, it means the path of the entries to display is "Tasks/*". The attribute whose value should be shown in the Gantt chart is the entry attribute itself. So the XML to display these entries would be as such:
2493 <entry path="Tasks/*">
2494 <display type="self" />
2498 But first, the view has to be declared. It has an ID, to uniquely identify this view among all the available XML files.
2501 <timeGraphView id="my.test.time.graph.view">
2504 Optional header information can be added to the view. '''analysis''' elements will associate the view only to the analysis identified by the "id" attribute. It can be either the ID of the state provider, like in this case, or the analysis ID of any analysis defined in Java. If no analysis is specified, the view will appear under every analysis with a state system. The '''label''' element allows to give a more user-friendly name to the view. The label does not have to be unique. As long as the ID is unique, views for different analyses can use the same name.
2508 <analysis id="my.test.state.provider" />
2509 <label value="My Sample XML View" />
2513 Also, if the values of the attributes to display are known, they can be defined, along with a text to explain them and a color to draw them with. Note that the values are the same as defined in the state provider, but the name does not have to be the same. While in the state provider, a simple constant string makes sense to use in state changes. But in the view, the name will appear in the legend, so a user-friendly text is more appropriate.
2516 <definedValue name="The process is running" value="100" color="#118811" />
2517 <definedValue name="Critical section" value="101" color="#881111" />
2518 <definedValue name="Waiting for critical section" value="102" color="#AEB522" />
2521 Here is the full XML for the time graph view:
2524 <tmfxml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../org.eclipse.tracecompass.tmf.analysis.xml.core/src/org/eclipse/tracecompass/tmf/analysis/xml/core/module/xmlDefinition.xsd">
2525 <timeGraphView id="my.test.time.graph.view">
2527 <analysis id="my.test.state.provider" />
2528 <label value="My Sample XML View" />
2531 <definedValue name="The process is running" value="100" color="#118811" />
2532 <definedValue name="Critical section" value="101" color="#881111" />
2533 <definedValue name="Waiting for critical section" value="102" color="#AEB522" />
2535 <entry path="Tasks/*">
2536 <display type="self" />
2542 The following screenshot shows the result of the preceding example on a test trace. The trace used, as well as the XML file are available [http://secretaire.dorsal.polymtl.ca/~gbastien/Xml4Traces/XML_documentation_example.tar.gz here].
2544 [[Image:images/Xml_analysis_screenshot.png| XML analysis with view]]
2546 == Defining an XML XY chart ==
2548 An XY chart displays series as a set of numerical values over time. The X-axis represents the time and is synchronized with the trace's current time range. The Y-axis can be any numerical value.
2550 Such views can be defined in XML using the data in the state system. The state system itself could have been built by an XML-defined state provider or by any pre-defined Java analysis. It only requires knowing the structure of the state system, which can be explored using the [[#State System Explorer View | State System Explorer View]] (or programmatically using the methods in ''ITmfStateSystem'').
2552 We will use the Linux Kernel Analysis on LTTng kernel traces to show an example XY chart. In this state system, the status of each CPU is a numerical value. We will display this value as the Y axis of the series. There will be one series per CPU. The XML to display these entries would be as such:
2555 <entry path="CPUs/*">
2556 <display type="constant" value="Status" />
2557 <name type="self" />
2561 But first, the view has to be declared. It has an ID, to uniquely identify this view among all the available XML files.
2564 <xyView id="my.test.xy.chart.view">
2567 Like for the time graph views, optional header information can be added to the view. '''analysis''' elements will associate the view only to the analysis identified by the "id" attribute. It can be either the ID of the state provider, like in this case, or the analysis ID of any analysis defined in Java. If no analysis is specified, the view will appear under every analysis with a state system. The '''label''' element allows to give a more user-friendly name to the view. The label does not have to be unique. As long as the ID is unique, views for different analyses can use the same name.
2571 <analysis id="org.eclipse.tracecompass.lttng2.kernel.analysis" />
2572 <label value="CPU status XY view" />
2576 Here is the full XML for the XY Chart that displays the CPU status over time of an LTTng Kernel Trace:
2579 <tmfxml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../org.eclipse.tracecompass.tmf.analysis.xml.core/src/org/eclipse/tracecompass/tmf/analysis/xml/core/module/xmlDefinition.xsd">
2580 <xyView id="my.test.xy.chart.view">
2582 <analysis id="org.eclipse.tracecompass.lttng2.kernel.analysis" />
2583 <label value="CPU status XY view" />
2586 <entry path="CPUs/*">
2587 <display type="constant" value="Status" />
2588 <name type="self" />
2594 The following screenshot shows the result of the preceding example on a LTTng Kernel Trace.
2596 [[Image:images/XML_xy_chart.png| XML XY chart]]
2600 * When parsing text traces, the timestamps are assumed to be in the local time zone. This means that when combining it to CTF binary traces, there could be offsets by a few hours depending on where the traces were taken and where they were read.
2601 * LTTng Tools v2.1.0 introduced the command line options ''--no-consumer'' and ''--disable-consumer'' for session creation as well as the commands ''enable-consumer'' and ''disable-consumer''. The LTTng Tracer Control in Eclipse doesn't support these options and commands because they will obsolete in LTTng Tools v2.2.0 and because the procedure for session creation offers already all relevant advanced parameters.
2603 = How to use LTTng to diagnose problems =
2605 LTTng is a tracer, it will give an enormous amount of information about the system it is running on. This means it can solve many types of problems.
2607 The following are examples of problems that can be solved with a tracer.
2609 == Random stutters ==
2611 Bob is running a computer program and it stutters periodically every 2 minutes. The CPU load is relatively low and Bob isn't running low on RAM.
2613 He decides to trace his complete system for 10 minutes. He opens the LTTng view in eclipse. From the control, he creates a session and enables all kernel tracepoints.
2615 He now has a 10 GB trace file. He imports the trace to his viewer and loads it up.
2617 A cursory look at the histogram bar on the bottom show relatively even event distribution, there are no interesting spikes, so he will have to dig deeper to find the issue. If he had seen a spike every 2 minutes, there would be strong chances this would be the first thing to investigate as it would imply a lot of kernel activity at the same period as his glitch, this would have been a path to investigate.
2619 As Bob suspects that he may be having some hardware raising IRQs or some other hardware based issue and adding delays. He looks at the ressource view and doesn't see anything abnormal.
2621 Bob did note an exact second one glitch occurred: 11:58:03. He zooms into the time range or 11:58:02-11:58:04 using the histogram. He is happy to see the time is human readable local wall clock time and no longer in "nanseconds since the last reboot". <br>In the resource view, once again, he sees many soft irqs being raised at the same time, around the time his GUI would freeze. He changes views and looks at the control flow view at that time and sees a process spending a lot of time in the kernel: FooMonitor- his temperature monitoring software.
2623 At this point he closes FooMonitor and notices the bug disappeared. He could call it a day but he wants to see what was causing the system to freeze. He cannot justify closing a piece of software without understanding the issue. It may be a conflict that HIS software is causing after all.
2625 The system freezes around the time this program is running. He clicks on the process in the control flow view and looks at the corresponding events in the detailed events view. He sees: open - read - close repeated hundreds of times on the same file. The file being read was /dev/HWmonitor. He sends a report to the FooMonitor team and warns his team that FooMonitor was glitching their performance.
2627 The FooMonitor team finds that they were calling a system bus call that would halt a CPU while reading the temperature so that the core would not induce an 0.1 degree error in the reading, by disabling this feature, they improve their software and stop the glitches from occurring on their custommer's machine. They also optimize their code to open the file read and clone it once.
2629 By using system wide kernel tracing, even without deep kernel knowledge Bob was able to isolate a bug in a rogue piece of software in his system.
2633 Alice is running her server. She noticed that one of her nodes was slowing down, and wasn't sure why, upon reading the trace she noticed that her time between a block request and complete was around 10ms.
2635 This is abnormal, normally her server handles IOs in under 100us, since they are quite local.
2637 She walks up to the server and hears the hard drive thrashing, This prompts her to look up in the events view the sectors being read in the block complete requests. There are her requests interleaved with other ones at the opposite side of the hard drive.
2639 She sees the tracer writing but there is another process that is writing to the server disk non stop. She looks in the control flow view and sees that there's a program from another fellow engineer, "Wally" that is writing in his home in a loop "All work and no play makes Jack a dull boy.".
2641 Alice kills the program, and immediately the server speeds up. She then goes to discuss this with Wally and implements strict hard disk quotas on the server.
2645 * [http://www.eclipse.org/tracecompass Trace Compass project]
2646 * [https://wiki.eclipse.org/index.php/Trace_Compass#User_Guides Trace Compass User Guides]
2647 * [http://www.lttng.org/ LTTng project]
2648 * [http://lttng.org/files/doc/man-pages/man1/lttng.1.html LTTng Tracer Control Command Line Tool User Manual]
2649 * [http://lttng.org/files/doc/man-pages/man8/lttng-relayd.8.html LTTng relayd User Manual]