1 // SPDX-License-Identifier: GPL-2.0
5 * Simple memcpy() and memset() benchmarks
7 * Written by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
12 #include "../util/util.h"
13 #include <subcmd/parse-options.h>
14 #include "../util/header.h"
15 #include "../util/cloexec.h"
16 #include "../util/string2.h"
18 #include "mem-memcpy-arch.h"
19 #include "mem-memset-arch.h"
26 #include <linux/time64.h>
30 static const char *size_str = "1MB";
31 static const char *function_str = "all";
32 static int nr_loops = 1;
33 static bool use_cycles;
36 static const struct option options[] = {
37 OPT_STRING('s', "size", &size_str, "1MB",
38 "Specify the size of the memory buffers. "
39 "Available units: B, KB, MB, GB and TB (case insensitive)"),
41 OPT_STRING('f', "function", &function_str, "all",
42 "Specify the function to run, \"all\" runs all available functions, \"help\" lists them"),
44 OPT_INTEGER('l', "nr_loops", &nr_loops,
45 "Specify the number of loops to run. (default: 1)"),
47 OPT_BOOLEAN('c', "cycles", &use_cycles,
48 "Use a cycles event instead of gettimeofday() to measure performance"),
53 typedef void *(*memcpy_t)(void *, const void *, size_t);
54 typedef void *(*memset_t)(void *, int, size_t);
65 static struct perf_event_attr cycle_attr = {
66 .type = PERF_TYPE_HARDWARE,
67 .config = PERF_COUNT_HW_CPU_CYCLES
70 static int init_cycles(void)
72 cycles_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1, perf_event_open_cloexec_flag());
74 if (cycles_fd < 0 && errno == ENOSYS) {
75 pr_debug("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
82 static u64 get_cycles(void)
87 ret = read(cycles_fd, &clk, sizeof(u64));
88 BUG_ON(ret != sizeof(u64));
93 static double timeval2double(struct timeval *ts)
95 return (double)ts->tv_sec + (double)ts->tv_usec / (double)USEC_PER_SEC;
98 #define print_bps(x) do { \
100 printf(" %14lf bytes/sec\n", x); \
101 else if (x < K * K) \
102 printf(" %14lfd KB/sec\n", x / K); \
103 else if (x < K * K * K) \
104 printf(" %14lf MB/sec\n", x / K / K); \
106 printf(" %14lf GB/sec\n", x / K / K / K); \
109 struct bench_mem_info {
110 const struct function *functions;
111 u64 (*do_cycles)(const struct function *r, size_t size, void *src, void *dst);
112 double (*do_gettimeofday)(const struct function *r, size_t size, void *src, void *dst);
113 const char *const *usage;
117 static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t size, double size_total)
119 const struct function *r = &info->functions[r_idx];
120 double result_bps = 0.0;
121 u64 result_cycles = 0;
122 void *src = NULL, *dst = zalloc(size);
124 printf("# function '%s' (%s)\n", r->name, r->desc);
127 goto out_alloc_failed;
129 if (info->alloc_src) {
132 goto out_alloc_failed;
135 if (bench_format == BENCH_FORMAT_DEFAULT)
136 printf("# Copying %s bytes ...\n\n", size_str);
139 result_cycles = info->do_cycles(r, size, src, dst);
141 result_bps = info->do_gettimeofday(r, size, src, dst);
144 switch (bench_format) {
145 case BENCH_FORMAT_DEFAULT:
147 printf(" %14lf cycles/byte\n", (double)result_cycles/size_total);
149 print_bps(result_bps);
153 case BENCH_FORMAT_SIMPLE:
155 printf("%lf\n", (double)result_cycles/size_total);
157 printf("%lf\n", result_bps);
171 printf("# Memory allocation failed - maybe size (%s) is too large?\n", size_str);
175 static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *info)
181 argc = parse_options(argc, argv, options, info->usage, 0);
186 fprintf(stderr, "Failed to open cycles counter\n");
191 size = (size_t)perf_atoll((char *)size_str);
192 size_total = (double)size * nr_loops;
194 if ((s64)size <= 0) {
195 fprintf(stderr, "Invalid size:%s\n", size_str);
199 if (!strncmp(function_str, "all", 3)) {
200 for (i = 0; info->functions[i].name; i++)
201 __bench_mem_function(info, i, size, size_total);
205 for (i = 0; info->functions[i].name; i++) {
206 if (!strcmp(info->functions[i].name, function_str))
209 if (!info->functions[i].name) {
210 if (strcmp(function_str, "help") && strcmp(function_str, "h"))
211 printf("Unknown function: %s\n", function_str);
212 printf("Available functions:\n");
213 for (i = 0; info->functions[i].name; i++) {
214 printf("\t%s ... %s\n",
215 info->functions[i].name, info->functions[i].desc);
220 __bench_mem_function(info, i, size, size_total);
225 static void memcpy_prefault(memcpy_t fn, size_t size, void *src, void *dst)
227 /* Make sure to always prefault zero pages even if MMAP_THRESH is crossed: */
228 memset(src, 0, size);
231 * We prefault the freshly allocated memory range here,
232 * to not measure page fault overhead:
237 static u64 do_memcpy_cycles(const struct function *r, size_t size, void *src, void *dst)
239 u64 cycle_start = 0ULL, cycle_end = 0ULL;
240 memcpy_t fn = r->fn.memcpy;
243 memcpy_prefault(fn, size, src, dst);
245 cycle_start = get_cycles();
246 for (i = 0; i < nr_loops; ++i)
248 cycle_end = get_cycles();
250 return cycle_end - cycle_start;
253 static double do_memcpy_gettimeofday(const struct function *r, size_t size, void *src, void *dst)
255 struct timeval tv_start, tv_end, tv_diff;
256 memcpy_t fn = r->fn.memcpy;
259 memcpy_prefault(fn, size, src, dst);
261 BUG_ON(gettimeofday(&tv_start, NULL));
262 for (i = 0; i < nr_loops; ++i)
264 BUG_ON(gettimeofday(&tv_end, NULL));
266 timersub(&tv_end, &tv_start, &tv_diff);
268 return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
271 struct function memcpy_functions[] = {
273 .desc = "Default memcpy() provided by glibc",
274 .fn.memcpy = memcpy },
276 #ifdef HAVE_ARCH_X86_64_SUPPORT
277 # define MEMCPY_FN(_fn, _name, _desc) {.name = _name, .desc = _desc, .fn.memcpy = _fn},
278 # include "mem-memcpy-x86-64-asm-def.h"
285 static const char * const bench_mem_memcpy_usage[] = {
286 "perf bench mem memcpy <options>",
290 int bench_mem_memcpy(int argc, const char **argv)
292 struct bench_mem_info info = {
293 .functions = memcpy_functions,
294 .do_cycles = do_memcpy_cycles,
295 .do_gettimeofday = do_memcpy_gettimeofday,
296 .usage = bench_mem_memcpy_usage,
300 return bench_mem_common(argc, argv, &info);
303 static u64 do_memset_cycles(const struct function *r, size_t size, void *src __maybe_unused, void *dst)
305 u64 cycle_start = 0ULL, cycle_end = 0ULL;
306 memset_t fn = r->fn.memset;
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();
320 return cycle_end - cycle_start;
323 static double do_memset_gettimeofday(const struct function *r, size_t size, void *src __maybe_unused, void *dst)
325 struct timeval tv_start, tv_end, tv_diff;
326 memset_t fn = r->fn.memset;
330 * We prefault the freshly allocated memory range here,
331 * to not measure page fault overhead:
335 BUG_ON(gettimeofday(&tv_start, NULL));
336 for (i = 0; i < nr_loops; ++i)
338 BUG_ON(gettimeofday(&tv_end, NULL));
340 timersub(&tv_end, &tv_start, &tv_diff);
342 return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
345 static const char * const bench_mem_memset_usage[] = {
346 "perf bench mem memset <options>",
350 static const struct function memset_functions[] = {
352 .desc = "Default memset() provided by glibc",
353 .fn.memset = memset },
355 #ifdef HAVE_ARCH_X86_64_SUPPORT
356 # define MEMSET_FN(_fn, _name, _desc) { .name = _name, .desc = _desc, .fn.memset = _fn },
357 # include "mem-memset-x86-64-asm-def.h"
364 int bench_mem_memset(int argc, const char **argv)
366 struct bench_mem_info info = {
367 .functions = memset_functions,
368 .do_cycles = do_memset_cycles,
369 .do_gettimeofday = do_memset_gettimeofday,
370 .usage = bench_mem_memset_usage,
373 return bench_mem_common(argc, argv, &info);