tools/perf/bench/mem-functions.c

   1 /*
   2  * mem-memcpy.c
   3  *
   4  * Simple memcpy() and memset() benchmarks
   5  *
   6  * Written by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
   7  */
   8
   9 #include "../perf.h"
  10 #include "../util/util.h"
  11 #include <subcmd/parse-options.h>
  12 #include "../util/header.h"
  13 #include "../util/cloexec.h"
  14 #include "bench.h"
  15 #include "mem-memcpy-arch.h"
  16 #include "mem-memset-arch.h"
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <sys/time.h>
  22 #include <errno.h>
  23
  24 #define K 1024
  25
  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;
  30 static int              cycles_fd;
  31
  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)"),
  36
  37         OPT_STRING('f', "function", &function_str, "all",
  38                     "Specify the function to run, \"all\" runs all available functions, \"help\" lists them"),
  39
  40         OPT_INTEGER('l', "nr_loops", &nr_loops,
  41                     "Specify the number of loops to run. (default: 1)"),
  42
  43         OPT_BOOLEAN('c', "cycles", &use_cycles,
  44                     "Use a cycles event instead of gettimeofday() to measure performance"),
  45
  46         OPT_END()
  47 };
  48
  49 typedef void *(*memcpy_t)(void *, const void *, size_t);
  50 typedef void *(*memset_t)(void *, int, size_t);
  51
  52 struct function {
  53         const char *name;
  54         const char *desc;
  55         union {
  56                 memcpy_t memcpy;
  57                 memset_t memset;
  58         } fn;
  59 };
  60
  61 static struct perf_event_attr cycle_attr = {
  62         .type           = PERF_TYPE_HARDWARE,
  63         .config         = PERF_COUNT_HW_CPU_CYCLES
  64 };
  65
  66 static void init_cycles(void)
  67 {
  68         cycles_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1, perf_event_open_cloexec_flag());
  69
  70         if (cycles_fd < 0 && errno == ENOSYS)
  71                 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
  72         else
  73                 BUG_ON(cycles_fd < 0);
  74 }
  75
  76 static u64 get_cycles(void)
  77 {
  78         int ret;
  79         u64 clk;
  80
  81         ret = read(cycles_fd, &clk, sizeof(u64));
  82         BUG_ON(ret != sizeof(u64));
  83
  84         return clk;
  85 }
  86
  87 static double timeval2double(struct timeval *ts)
  88 {
  89         return (double)ts->tv_sec + (double)ts->tv_usec / (double)1000000;
  90 }
  91
  92 #define print_bps(x) do {                                               \
  93                 if (x < K)                                              \
  94                         printf(" %14lf bytes/sec\n", x);                \
  95                 else if (x < K * K)                                     \
  96                         printf(" %14lfd KB/sec\n", x / K);              \
  97                 else if (x < K * K * K)                                 \
  98                         printf(" %14lf MB/sec\n", x / K / K);           \
  99                 else                                                    \
 100                         printf(" %14lf GB/sec\n", x / K / K / K);       \
 101         } while (0)
 102
 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;
 108 };
 109
 110 static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t size, double size_total)
 111 {
 112         const struct function *r = &info->functions[r_idx];
 113         double result_bps = 0.0;
 114         u64 result_cycles = 0;
 115
 116         printf("# function '%s' (%s)\n", r->name, r->desc);
 117
 118         if (bench_format == BENCH_FORMAT_DEFAULT)
 119                 printf("# Copying %s bytes ...\n\n", size_str);
 120
 121         if (use_cycles) {
 122                 result_cycles = info->do_cycles(r, size);
 123         } else {
 124                 result_bps = info->do_gettimeofday(r, size);
 125         }
 126
 127         switch (bench_format) {
 128         case BENCH_FORMAT_DEFAULT:
 129                 if (use_cycles) {
 130                         printf(" %14lf cycles/byte\n", (double)result_cycles/size_total);
 131                 } else {
 132                         print_bps(result_bps);
 133                 }
 134                 break;
 135
 136         case BENCH_FORMAT_SIMPLE:
 137                 if (use_cycles) {
 138                         printf("%lf\n", (double)result_cycles/size_total);
 139                 } else {
 140                         printf("%lf\n", result_bps);
 141                 }
 142                 break;
 143
 144         default:
 145                 BUG_ON(1);
 146                 break;
 147         }
 148 }
 149
 150 static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *info)
 151 {
 152         int i;
 153         size_t size;
 154         double size_total;
 155
 156         argc = parse_options(argc, argv, options, info->usage, 0);
 157
 158         if (use_cycles)
 159                 init_cycles();
 160
 161         size = (size_t)perf_atoll((char *)size_str);
 162         size_total = (double)size * nr_loops;
 163
 164         if ((s64)size <= 0) {
 165                 fprintf(stderr, "Invalid size:%s\n", size_str);
 166                 return 1;
 167         }
 168
 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);
 172                 return 0;
 173         }
 174
 175         for (i = 0; info->functions[i].name; i++) {
 176                 if (!strcmp(info->functions[i].name, function_str))
 177                         break;
 178         }
 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);
 186                 }
 187                 return 1;
 188         }
 189
 190         __bench_mem_function(info, i, size, size_total);
 191
 192         return 0;
 193 }
 194
 195 static void memcpy_alloc_mem(void **dst, void **src, size_t size)
 196 {
 197         *dst = zalloc(size);
 198         if (!*dst)
 199                 die("memory allocation failed - maybe size is too large?\n");
 200
 201         *src = zalloc(size);
 202         if (!*src)
 203                 die("memory allocation failed - maybe size is too large?\n");
 204
 205         /* Make sure to always prefault zero pages even if MMAP_THRESH is crossed: */
 206         memset(*src, 0, size);
 207 }
 208
 209 static u64 do_memcpy_cycles(const struct function *r, size_t size)
 210 {
 211         u64 cycle_start = 0ULL, cycle_end = 0ULL;
 212         void *src = NULL, *dst = NULL;
 213         memcpy_t fn = r->fn.memcpy;
 214         int i;
 215
 216         memcpy_alloc_mem(&dst, &src, size);
 217
 218         /*
 219          * We prefault the freshly allocated memory range here,
 220          * to not measure page fault overhead:
 221          */
 222         fn(dst, src, size);
 223
 224         cycle_start = get_cycles();
 225         for (i = 0; i < nr_loops; ++i)
 226                 fn(dst, src, size);
 227         cycle_end = get_cycles();
 228
 229         free(src);
 230         free(dst);
 231         return cycle_end - cycle_start;
 232 }
 233
 234 static double do_memcpy_gettimeofday(const struct function *r, size_t size)
 235 {
 236         struct timeval tv_start, tv_end, tv_diff;
 237         memcpy_t fn = r->fn.memcpy;
 238         void *src = NULL, *dst = NULL;
 239         int i;
 240
 241         memcpy_alloc_mem(&dst, &src, size);
 242
 243         /*
 244          * We prefault the freshly allocated memory range here,
 245          * to not measure page fault overhead:
 246          */
 247         fn(dst, src, size);
 248
 249         BUG_ON(gettimeofday(&tv_start, NULL));
 250         for (i = 0; i < nr_loops; ++i)
 251                 fn(dst, src, size);
 252         BUG_ON(gettimeofday(&tv_end, NULL));
 253
 254         timersub(&tv_end, &tv_start, &tv_diff);
 255
 256         free(src);
 257         free(dst);
 258
 259         return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
 260 }
 261
 262 struct function memcpy_functions[] = {
 263         { .name         = "default",
 264           .desc         = "Default memcpy() provided by glibc",
 265           .fn.memcpy    = memcpy },
 266
 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"
 270 # undef MEMCPY_FN
 271 #endif
 272
 273         { .name = NULL, }
 274 };
 275
 276 static const char * const bench_mem_memcpy_usage[] = {
 277         "perf bench mem memcpy <options>",
 278         NULL
 279 };
 280
 281 int bench_mem_memcpy(int argc, const char **argv, const char *prefix __maybe_unused)
 282 {
 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,
 288         };
 289
 290         return bench_mem_common(argc, argv, &info);
 291 }
 292
 293 static void memset_alloc_mem(void **dst, size_t size)
 294 {
 295         *dst = zalloc(size);
 296         if (!*dst)
 297                 die("memory allocation failed - maybe size is too large?\n");
 298 }
 299
 300 static u64 do_memset_cycles(const struct function *r, size_t size)
 301 {
 302         u64 cycle_start = 0ULL, cycle_end = 0ULL;
 303         memset_t fn = r->fn.memset;
 304         void *dst = NULL;
 305         int i;
 306
 307         memset_alloc_mem(&dst, size);
 308
 309         /*
 310          * We prefault the freshly allocated memory range here,
 311          * to not measure page fault overhead:
 312          */
 313         fn(dst, -1, size);
 314
 315         cycle_start = get_cycles();
 316         for (i = 0; i < nr_loops; ++i)
 317                 fn(dst, i, size);
 318         cycle_end = get_cycles();
 319
 320         free(dst);
 321         return cycle_end - cycle_start;
 322 }
 323
 324 static double do_memset_gettimeofday(const struct function *r, size_t size)
 325 {
 326         struct timeval tv_start, tv_end, tv_diff;
 327         memset_t fn = r->fn.memset;
 328         void *dst = NULL;
 329         int i;
 330
 331         memset_alloc_mem(&dst, size);
 332
 333         /*
 334          * We prefault the freshly allocated memory range here,
 335          * to not measure page fault overhead:
 336          */
 337         fn(dst, -1, size);
 338
 339         BUG_ON(gettimeofday(&tv_start, NULL));
 340         for (i = 0; i < nr_loops; ++i)
 341                 fn(dst, i, size);
 342         BUG_ON(gettimeofday(&tv_end, NULL));
 343
 344         timersub(&tv_end, &tv_start, &tv_diff);
 345
 346         free(dst);
 347         return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
 348 }
 349
 350 static const char * const bench_mem_memset_usage[] = {
 351         "perf bench mem memset <options>",
 352         NULL
 353 };
 354
 355 static const struct function memset_functions[] = {
 356         { .name         = "default",
 357           .desc         = "Default memset() provided by glibc",
 358           .fn.memset    = memset },
 359
 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"
 363 # undef MEMSET_FN
 364 #endif
 365
 366         { .name = NULL, }
 367 };
 368
 369 int bench_mem_memset(int argc, const char **argv, const char *prefix __maybe_unused)
 370 {
 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,
 376         };
 377
 378         return bench_mem_common(argc, argv, &info);
 379 }