org.eclipse.linuxtools.lttng.headless/src/LttngTraceTest.java

   1 /*******************************************************************************
   2  * Copyright (c) 2009 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   William Bourque (wbourque@gmail.com) - Initial API and implementation
  11  *******************************************************************************/
  12
  13 import org.eclipse.linuxtools.lttng.event.LttngEvent;
  14 import org.eclipse.linuxtools.lttng.event.LttngLocation;
  15 import org.eclipse.linuxtools.lttng.event.LttngTimestamp;
  16 import org.eclipse.linuxtools.lttng.trace.LTTngTextTrace;
  17 import org.eclipse.linuxtools.lttng.trace.LTTngTrace;
  18 import org.eclipse.linuxtools.tmf.trace.TmfContext;
  19 import org.eclipse.linuxtools.tmf.trace.TmfTrace;
  20
  21
  22 public class LttngTraceTest {
  23
  24         /**
  25          * @param args
  26          */
  27         public static void main(String[] args) {
  28
  29                 // Path of the trace
  30         final String TRACE_PATH = "/home/francois/Desktop/Workspaces/LTTngTraces/trace_2GB";
  31
  32         // *** Change to true to use the "fake" LttngTextTrace instead of LTTngTrace
  33         // To use this, you need a ".txt" trace.
  34         // You can get it using LTTv with the command "lttv -m textDump -t /tmp/sometrace > mytrace.txt"
  35         final boolean USE_TEXT_TRACE = false;
  36
  37         // *** Change this to run several time over the same trace
  38         final int NB_OF_PASS = 1;
  39
  40         // *** Change this to true to parse all the events in the trace
  41         //      Otherwise, events are just read
  42         final boolean PARSE_EVENTS = true;
  43
  44
  45         // Work variables
  46         TmfTrace<LttngEvent> tmptrace = null;
  47         LttngEvent tmpevent = null;
  48         TmfContext tmpContext = null;
  49         Long nbEvent = 0L;
  50
  51                 try {
  52                         // ** Use TextTrace (slow!) if it was asked
  53                         if ( USE_TEXT_TRACE ) {
  54                                 tmptrace = new LTTngTextTrace(TRACE_PATH, true);
  55                         } else {
  56                                 tmptrace = new LTTngTrace(TRACE_PATH, true, true);
  57                         }
  58
  59                         LttngTimestamp tmpTime = new LttngTimestamp(0L);
  60             tmpContext = new TmfContext(new LttngLocation(0L), 0);
  61
  62
  63             long startTime = System.nanoTime();
  64             System.out.println("Start: " + startTime);
  65             for ( int nb=0; nb<NB_OF_PASS; nb++) {
  66
  67                                 // Seek to the beginning of the trace
  68                             tmpContext = tmptrace.seekEvent( tmpTime  );
  69                                 tmpevent = (LttngEvent)tmptrace.getNextEvent(tmpContext);
  70
  71                                 while ( tmpevent != null ) {
  72                                         tmpevent = (LttngEvent)tmptrace.getNextEvent(tmpContext);
  73
  74                                         // Parse the events if it was asked
  75                                         if ( (tmpevent != null) && (PARSE_EVENTS) ) {
  76                                                 tmpevent.getContent().getFields();
  77
  78                                                 // *** Uncomment the following to print the parsed content
  79                             // Warning : this is VERY intensive
  80                                                 //
  81 //                                              System.out.println(tmpevent.toString());
  82                                                 //System.out.println(testEvent.getContent().toString());
  83                                         }
  84
  85                                         nbEvent++;
  86                                 }
  87                         }
  88
  89                         System.out.println("NB events : " + nbEvent);
  90
  91             long endTime = System.nanoTime();
  92             long elapsed = endTime - startTime;
  93                         System.out.println("End: " + endTime);
  94                         System.out.println("Elapsed: " + elapsed + ", Average: " + (elapsed/nbEvent) + "ns/evt");
  95
  96                 }
  97                 catch (Exception e) {
  98                         e.printStackTrace();
  99                 }
 100
 101         }
 102
 103 }