4 * Simple memcpy() and memset() benchmarks
6 * Written by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
10 #include "../util/util.h"
11 #include "../util/parse-options.h"
12 #include "../util/header.h"
13 #include "../util/cloexec.h"
15 #include "mem-memcpy-arch.h"
16 #include "mem-memset-arch.h"
26 static const char *length_str
= "1MB";
27 static const char *routine
= "all";
28 static int iterations
= 1;
29 static bool use_cycle
;
31 static bool only_prefault
;
32 static bool no_prefault
;
34 static const struct option options
[] = {
35 OPT_STRING('l', "length", &length_str
, "1MB",
36 "Specify length of memory to copy. "
37 "Available units: B, KB, MB, GB and TB (upper and lower)"),
38 OPT_STRING('r', "routine", &routine
, "all",
39 "Specify routine to copy, \"all\" runs all available routines"),
40 OPT_INTEGER('i', "iterations", &iterations
,
41 "repeat memcpy() invocation this number of times"),
42 OPT_BOOLEAN('c', "cycle", &use_cycle
,
43 "Use cycles event instead of gettimeofday() for measuring"),
44 OPT_BOOLEAN('o', "only-prefault", &only_prefault
,
45 "Show only the result with page faults before memcpy()"),
46 OPT_BOOLEAN('n', "no-prefault", &no_prefault
,
47 "Show only the result without page faults before memcpy()"),
51 typedef void *(*memcpy_t
)(void *, const void *, size_t);
52 typedef void *(*memset_t
)(void *, int, size_t);
63 struct routine memcpy_routines
[] = {
65 .desc
= "Default memcpy() provided by glibc",
66 .fn
.memcpy
= memcpy
},
68 #ifdef HAVE_ARCH_X86_64_SUPPORT
69 # define MEMCPY_FN(_fn, _name, _desc) {.name = _name, .desc = _desc, .fn.memcpy = _fn},
70 # include "mem-memcpy-x86-64-asm-def.h"
77 static const char * const bench_mem_memcpy_usage
[] = {
78 "perf bench mem memcpy <options>",
82 static struct perf_event_attr cycle_attr
= {
83 .type
= PERF_TYPE_HARDWARE
,
84 .config
= PERF_COUNT_HW_CPU_CYCLES
87 static void init_cycle(void)
89 cycle_fd
= sys_perf_event_open(&cycle_attr
, getpid(), -1, -1, perf_event_open_cloexec_flag());
91 if (cycle_fd
< 0 && errno
== ENOSYS
)
92 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
97 static u64
get_cycle(void)
102 ret
= read(cycle_fd
, &clk
, sizeof(u64
));
103 BUG_ON(ret
!= sizeof(u64
));
108 static double timeval2double(struct timeval
*ts
)
110 return (double)ts
->tv_sec
+ (double)ts
->tv_usec
/ (double)1000000;
113 #define print_bps(x) do { \
115 printf(" %14lf B/Sec", x); \
116 else if (x < K * K) \
117 printf(" %14lfd KB/Sec", x / K); \
118 else if (x < K * K * K) \
119 printf(" %14lf MB/Sec", x / K / K); \
121 printf(" %14lf GB/Sec", x / K / K / K); \
124 struct bench_mem_info
{
125 const struct routine
*routines
;
126 u64 (*do_cycle
)(const struct routine
*r
, size_t len
, bool prefault
);
127 double (*do_gettimeofday
)(const struct routine
*r
, size_t len
, bool prefault
);
128 const char *const *usage
;
131 static void __bench_mem_routine(struct bench_mem_info
*info
, int r_idx
, size_t len
, double totallen
)
133 const struct routine
*r
= &info
->routines
[r_idx
];
134 double result_bps
[2];
136 int prefault
= no_prefault
? 0 : 1;
138 result_cycle
[0] = result_cycle
[1] = 0ULL;
139 result_bps
[0] = result_bps
[1] = 0.0;
141 printf("Routine %s (%s)\n", r
->name
, r
->desc
);
143 if (bench_format
== BENCH_FORMAT_DEFAULT
)
144 printf("# Copying %s Bytes ...\n\n", length_str
);
146 if (!only_prefault
&& prefault
) {
147 /* Show both results: */
149 result_cycle
[0] = info
->do_cycle(r
, len
, false);
150 result_cycle
[1] = info
->do_cycle(r
, len
, true);
152 result_bps
[0] = info
->do_gettimeofday(r
, len
, false);
153 result_bps
[1] = info
->do_gettimeofday(r
, len
, true);
157 result_cycle
[prefault
] = info
->do_cycle(r
, len
, only_prefault
);
159 result_bps
[prefault
] = info
->do_gettimeofday(r
, len
, only_prefault
);
162 switch (bench_format
) {
163 case BENCH_FORMAT_DEFAULT
:
164 if (!only_prefault
&& prefault
) {
166 printf(" %14lf Cycle/Byte\n",
167 (double)result_cycle
[0]
169 printf(" %14lf Cycle/Byte (with prefault)\n",
170 (double)result_cycle
[1]
173 print_bps(result_bps
[0]);
175 print_bps(result_bps
[1]);
176 printf(" (with prefault)\n");
180 printf(" %14lf Cycle/Byte",
181 (double)result_cycle
[prefault
]
184 print_bps(result_bps
[prefault
]);
186 printf("%s\n", only_prefault
? " (with prefault)" : "");
189 case BENCH_FORMAT_SIMPLE
:
190 if (!only_prefault
&& prefault
) {
193 (double)result_cycle
[0] / totallen
,
194 (double)result_cycle
[1] / totallen
);
197 result_bps
[0], result_bps
[1]);
201 printf("%lf\n", (double)result_cycle
[prefault
]
204 printf("%lf\n", result_bps
[prefault
]);
208 /* Reaching this means there's some disaster: */
209 die("unknown format: %d\n", bench_format
);
214 static int bench_mem_common(int argc
, const char **argv
, struct bench_mem_info
*info
)
220 argc
= parse_options(argc
, argv
, options
, info
->usage
, 0);
222 if (no_prefault
&& only_prefault
) {
223 fprintf(stderr
, "Invalid options: -o and -n are mutually exclusive\n");
230 len
= (size_t)perf_atoll((char *)length_str
);
231 totallen
= (double)len
* iterations
;
234 fprintf(stderr
, "Invalid length:%s\n", length_str
);
238 /* Same as without specifying either of prefault and no-prefault: */
239 if (only_prefault
&& no_prefault
)
240 only_prefault
= no_prefault
= false;
242 if (!strncmp(routine
, "all", 3)) {
243 for (i
= 0; info
->routines
[i
].name
; i
++)
244 __bench_mem_routine(info
, i
, len
, totallen
);
248 for (i
= 0; info
->routines
[i
].name
; i
++) {
249 if (!strcmp(info
->routines
[i
].name
, routine
))
252 if (!info
->routines
[i
].name
) {
253 printf("Unknown routine:%s\n", routine
);
254 printf("Available routines...\n");
255 for (i
= 0; info
->routines
[i
].name
; i
++) {
256 printf("\t%s ... %s\n",
257 info
->routines
[i
].name
, info
->routines
[i
].desc
);
262 __bench_mem_routine(info
, i
, len
, totallen
);
267 static void memcpy_alloc_mem(void **dst
, void **src
, size_t length
)
269 *dst
= zalloc(length
);
271 die("memory allocation failed - maybe length is too large?\n");
273 *src
= zalloc(length
);
275 die("memory allocation failed - maybe length is too large?\n");
277 /* Make sure to always prefault zero pages even if MMAP_THRESH is crossed: */
278 memset(*src
, 0, length
);
281 static u64
do_memcpy_cycle(const struct routine
*r
, size_t len
, bool prefault
)
283 u64 cycle_start
= 0ULL, cycle_end
= 0ULL;
284 void *src
= NULL
, *dst
= NULL
;
285 memcpy_t fn
= r
->fn
.memcpy
;
288 memcpy_alloc_mem(&dst
, &src
, len
);
293 cycle_start
= get_cycle();
294 for (i
= 0; i
< iterations
; ++i
)
296 cycle_end
= get_cycle();
300 return cycle_end
- cycle_start
;
303 static double do_memcpy_gettimeofday(const struct routine
*r
, size_t len
, bool prefault
)
305 struct timeval tv_start
, tv_end
, tv_diff
;
306 memcpy_t fn
= r
->fn
.memcpy
;
307 void *src
= NULL
, *dst
= NULL
;
310 memcpy_alloc_mem(&dst
, &src
, len
);
315 BUG_ON(gettimeofday(&tv_start
, NULL
));
316 for (i
= 0; i
< iterations
; ++i
)
318 BUG_ON(gettimeofday(&tv_end
, NULL
));
320 timersub(&tv_end
, &tv_start
, &tv_diff
);
324 return (double)(((double)len
* iterations
) / timeval2double(&tv_diff
));
327 int bench_mem_memcpy(int argc
, const char **argv
, const char *prefix __maybe_unused
)
329 struct bench_mem_info info
= {
330 .routines
= memcpy_routines
,
331 .do_cycle
= do_memcpy_cycle
,
332 .do_gettimeofday
= do_memcpy_gettimeofday
,
333 .usage
= bench_mem_memcpy_usage
,
336 return bench_mem_common(argc
, argv
, &info
);
339 static void memset_alloc_mem(void **dst
, size_t length
)
341 *dst
= zalloc(length
);
343 die("memory allocation failed - maybe length is too large?\n");
346 static u64
do_memset_cycle(const struct routine
*r
, size_t len
, bool prefault
)
348 u64 cycle_start
= 0ULL, cycle_end
= 0ULL;
349 memset_t fn
= r
->fn
.memset
;
353 memset_alloc_mem(&dst
, len
);
358 cycle_start
= get_cycle();
359 for (i
= 0; i
< iterations
; ++i
)
361 cycle_end
= get_cycle();
364 return cycle_end
- cycle_start
;
367 static double do_memset_gettimeofday(const struct routine
*r
, size_t len
,
370 struct timeval tv_start
, tv_end
, tv_diff
;
371 memset_t fn
= r
->fn
.memset
;
375 memset_alloc_mem(&dst
, len
);
380 BUG_ON(gettimeofday(&tv_start
, NULL
));
381 for (i
= 0; i
< iterations
; ++i
)
383 BUG_ON(gettimeofday(&tv_end
, NULL
));
385 timersub(&tv_end
, &tv_start
, &tv_diff
);
388 return (double)(((double)len
* iterations
) / timeval2double(&tv_diff
));
391 static const char * const bench_mem_memset_usage
[] = {
392 "perf bench mem memset <options>",
396 static const struct routine memset_routines
[] = {
398 .desc
= "Default memset() provided by glibc",
399 .fn
.memset
= memset
},
401 #ifdef HAVE_ARCH_X86_64_SUPPORT
402 # define MEMSET_FN(_fn, _name, _desc) { .name = _name, .desc = _desc, .fn.memset = _fn },
403 # include "mem-memset-x86-64-asm-def.h"
410 int bench_mem_memset(int argc
, const char **argv
, const char *prefix __maybe_unused
)
412 struct bench_mem_info info
= {
413 .routines
= memset_routines
,
414 .do_cycle
= do_memset_cycle
,
415 .do_gettimeofday
= do_memset_gettimeofday
,
416 .usage
= bench_mem_memset_usage
,
419 return bench_mem_common(argc
, argv
, &info
);