4 * Simple memcpy() and memset() benchmarks
10 #include "../util/util.h"
11 #include <subcmd/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 *size_str = "1MB";
27 static const char *function_str = "all";
28 static int nr_loops = 1;
29 static bool use_cycles;
32 static const struct option options[] = {
33 OPT_STRING('s', "size", &size_str, "1MB",
34 "Specify the size of the memory buffers. "
35 "Available units: B, KB, MB, GB and TB (case insensitive)"),
37 OPT_STRING('f', "function", &function_str, "all",
38 "Specify the function to run, \"all\" runs all available functions, \"help\" lists them"),
40 OPT_INTEGER('l', "nr_loops", &nr_loops,
41 "Specify the number of loops to run. (default: 1)"),
43 OPT_BOOLEAN('c', "cycles", &use_cycles,
44 "Use a cycles event instead of gettimeofday() to measure performance"),
49 typedef void *(*memcpy_t)(void *, const void *, size_t);
50 typedef void *(*memset_t)(void *, int, size_t);
61 static struct perf_event_attr cycle_attr = {
62 .type = PERF_TYPE_HARDWARE,
63 .config = PERF_COUNT_HW_CPU_CYCLES
66 static void init_cycles(void)
68 cycles_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1, perf_event_open_cloexec_flag());
70 if (cycles_fd < 0 && errno == ENOSYS)
71 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
73 BUG_ON(cycles_fd < 0);
76 static u64 get_cycles(void)
81 ret = read(cycles_fd, &clk, sizeof(u64));
82 BUG_ON(ret != sizeof(u64));
87 static double timeval2double(struct timeval *ts)
89 return (double)ts->tv_sec + (double)ts->tv_usec / (double)1000000;
92 #define print_bps(x) do { \
94 printf(" %14lf bytes/sec\n", x); \
96 printf(" %14lfd KB/sec\n", x / K); \
97 else if (x < K * K * K) \
98 printf(" %14lf MB/sec\n", x / K / K); \
100 printf(" %14lf GB/sec\n", x / K / K / K); \
103 struct bench_mem_info {
104 const struct function *functions;
105 u64 (*do_cycles)(const struct function *r, size_t size);
106 double (*do_gettimeofday)(const struct function *r, size_t size);
107 const char *const *usage;
110 static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t size, double size_total)
112 const struct function *r = &info->functions[r_idx];
113 double result_bps = 0.0;
114 u64 result_cycles = 0;
116 printf("# function '%s' (%s)\n", r->name, r->desc);
118 if (bench_format == BENCH_FORMAT_DEFAULT)
119 printf("# Copying %s bytes ...\n\n", size_str);
122 result_cycles = info->do_cycles(r, size);
124 result_bps = info->do_gettimeofday(r, size);
127 switch (bench_format) {
128 case BENCH_FORMAT_DEFAULT:
130 printf(" %14lf cycles/byte\n", (double)result_cycles/size_total);
132 print_bps(result_bps);
136 case BENCH_FORMAT_SIMPLE:
138 printf("%lf\n", (double)result_cycles/size_total);
140 printf("%lf\n", result_bps);
150 static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *info)
156 argc = parse_options(argc, argv, options, info->usage, 0);
161 size = (size_t)perf_atoll((char *)size_str);
162 size_total = (double)size * nr_loops;
164 if ((s64)size <= 0) {
165 fprintf(stderr, "Invalid size:%s\n", size_str);
169 if (!strncmp(function_str, "all", 3)) {
170 for (i = 0; info->functions[i].name; i++)
171 __bench_mem_function(info, i, size, size_total);
175 for (i = 0; info->functions[i].name; i++) {
176 if (!strcmp(info->functions[i].name, function_str))
179 if (!info->functions[i].name) {
180 if (strcmp(function_str, "help") && strcmp(function_str, "h"))
181 printf("Unknown function: %s\n", function_str);
182 printf("Available functions:\n");
183 for (i = 0; info->functions[i].name; i++) {
184 printf("\t%s ... %s\n",
185 info->functions[i].name, info->functions[i].desc);
190 __bench_mem_function(info, i, size, size_total);
195 static void memcpy_alloc_mem(void **dst, void **src, size_t size)
199 die("memory allocation failed - maybe size is too large?\n");
203 die("memory allocation failed - maybe size is too large?\n");
205 /* Make sure to always prefault zero pages even if MMAP_THRESH is crossed: */
206 memset(*src, 0, size);
209 static u64 do_memcpy_cycles(const struct function *r, size_t size)
211 u64 cycle_start = 0ULL, cycle_end = 0ULL;
212 void *src = NULL, *dst = NULL;
213 memcpy_t fn = r->fn.memcpy;
216 memcpy_alloc_mem(&dst, &src, size);
219 * We prefault the freshly allocated memory range here,
220 * to not measure page fault overhead:
224 cycle_start = get_cycles();
225 for (i = 0; i < nr_loops; ++i)
227 cycle_end = get_cycles();
231 return cycle_end - cycle_start;
234 static double do_memcpy_gettimeofday(const struct function *r, size_t size)
236 struct timeval tv_start, tv_end, tv_diff;
237 memcpy_t fn = r->fn.memcpy;
238 void *src = NULL, *dst = NULL;
241 memcpy_alloc_mem(&dst, &src, size);
244 * We prefault the freshly allocated memory range here,
245 * to not measure page fault overhead:
249 BUG_ON(gettimeofday(&tv_start, NULL));
250 for (i = 0; i < nr_loops; ++i)
252 BUG_ON(gettimeofday(&tv_end, NULL));
254 timersub(&tv_end, &tv_start, &tv_diff);
259 return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
262 struct function memcpy_functions[] = {
264 .desc = "Default memcpy() provided by glibc",
265 .fn.memcpy = memcpy },
267 #ifdef HAVE_ARCH_X86_64_SUPPORT
268 # define MEMCPY_FN(_fn, _name, _desc) {.name = _name, .desc = _desc, .fn.memcpy = _fn},
269 # include "mem-memcpy-x86-64-asm-def.h"
276 static const char * const bench_mem_memcpy_usage[] = {
277 "perf bench mem memcpy <options>",
281 int bench_mem_memcpy(int argc, const char **argv, const char *prefix __maybe_unused)
283 struct bench_mem_info info = {
284 .functions = memcpy_functions,
285 .do_cycles = do_memcpy_cycles,
286 .do_gettimeofday = do_memcpy_gettimeofday,
287 .usage = bench_mem_memcpy_usage,
290 return bench_mem_common(argc, argv, &info);
293 static void memset_alloc_mem(void **dst, size_t size)
297 die("memory allocation failed - maybe size is too large?\n");
300 static u64 do_memset_cycles(const struct function *r, size_t size)
302 u64 cycle_start = 0ULL, cycle_end = 0ULL;
303 memset_t fn = r->fn.memset;
307 memset_alloc_mem(&dst, size);
310 * We prefault the freshly allocated memory range here,
311 * to not measure page fault overhead:
315 cycle_start = get_cycles();
316 for (i = 0; i < nr_loops; ++i)
318 cycle_end = get_cycles();
321 return cycle_end - cycle_start;
324 static double do_memset_gettimeofday(const struct function *r, size_t size)
326 struct timeval tv_start, tv_end, tv_diff;
327 memset_t fn = r->fn.memset;
331 memset_alloc_mem(&dst, size);
334 * We prefault the freshly allocated memory range here,
335 * to not measure page fault overhead:
339 BUG_ON(gettimeofday(&tv_start, NULL));
340 for (i = 0; i < nr_loops; ++i)
342 BUG_ON(gettimeofday(&tv_end, NULL));
344 timersub(&tv_end, &tv_start, &tv_diff);
347 return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
350 static const char * const bench_mem_memset_usage[] = {
351 "perf bench mem memset <options>",
355 static const struct function memset_functions[] = {
357 .desc = "Default memset() provided by glibc",
358 .fn.memset = memset },
360 #ifdef HAVE_ARCH_X86_64_SUPPORT
361 # define MEMSET_FN(_fn, _name, _desc) { .name = _name, .desc = _desc, .fn.memset = _fn },
362 # include "mem-memset-x86-64-asm-def.h"
369 int bench_mem_memset(int argc, const char **argv, const char *prefix __maybe_unused)
371 struct bench_mem_info info = {
372 .functions = memset_functions,
373 .do_cycles = do_memset_cycles,
374 .do_gettimeofday = do_memset_gettimeofday,
375 .usage = bench_mem_memset_usage,
378 return bench_mem_common(argc, argv, &info);