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 "debug.h"
  10 #include "../perf.h"
  11 #include "../util/util.h"
  12 #include <subcmd/parse-options.h>
  13 #include "../util/header.h"
  14 #include "../util/cloexec.h"
  15 #include "bench.h"
  16 #include "mem-memcpy-arch.h"
  17 #include "mem-memset-arch.h"
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <sys/time.h>
  23 #include <errno.h>
  24 #include <linux/time64.h>
  25
  26 #define K 1024
  27
  28 static const char       *size_str       = "1MB";
  29 static const char       *function_str   = "all";
  30 static int              nr_loops        = 1;
  31 static bool             use_cycles;
  32 static int              cycles_fd;
  33
  34 static const struct option options[] = {
  35         OPT_STRING('s', "size", &size_str, "1MB",
  36                     "Specify the size of the memory buffers. "
  37                     "Available units: B, KB, MB, GB and TB (case insensitive)"),
  38
  39         OPT_STRING('f', "function", &function_str, "all",
  40                     "Specify the function to run, \"all\" runs all available functions, \"help\" lists them"),
  41
  42         OPT_INTEGER('l', "nr_loops", &nr_loops,
  43                     "Specify the number of loops to run. (default: 1)"),
  44
  45         OPT_BOOLEAN('c', "cycles", &use_cycles,
  46                     "Use a cycles event instead of gettimeofday() to measure performance"),
  47
  48         OPT_END()
  49 };
  50
  51 typedef void *(*memcpy_t)(void *, const void *, size_t);
  52 typedef void *(*memset_t)(void *, int, size_t);
  53
  54 struct function {
  55         const char *name;
  56         const char *desc;
  57         union {
  58                 memcpy_t memcpy;
  59                 memset_t memset;
  60         } fn;
  61 };
  62
  63 static struct perf_event_attr cycle_attr = {
  64         .type           = PERF_TYPE_HARDWARE,
  65         .config         = PERF_COUNT_HW_CPU_CYCLES
  66 };
  67
  68 static int init_cycles(void)
  69 {
  70         cycles_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1, perf_event_open_cloexec_flag());
  71
  72         if (cycles_fd < 0 && errno == ENOSYS) {
  73                 pr_debug("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
  74                 return -1;
  75         }
  76
  77         return cycles_fd;
  78 }
  79
  80 static u64 get_cycles(void)
  81 {
  82         int ret;
  83         u64 clk;
  84
  85         ret = read(cycles_fd, &clk, sizeof(u64));
  86         BUG_ON(ret != sizeof(u64));
  87
  88         return clk;
  89 }
  90
  91 static double timeval2double(struct timeval *ts)
  92 {
  93         return (double)ts->tv_sec + (double)ts->tv_usec / (double)USEC_PER_SEC;
  94 }
  95
  96 #define print_bps(x) do {                                               \
  97                 if (x < K)                                              \
  98                         printf(" %14lf bytes/sec\n", x);                \
  99                 else if (x < K * K)                                     \
 100                         printf(" %14lfd KB/sec\n", x / K);              \
 101                 else if (x < K * K * K)                                 \
 102                         printf(" %14lf MB/sec\n", x / K / K);           \
 103                 else                                                    \
 104                         printf(" %14lf GB/sec\n", x / K / K / K);       \
 105         } while (0)
 106
 107 struct bench_mem_info {
 108         const struct function *functions;
 109         u64 (*do_cycles)(const struct function *r, size_t size);
 110         double (*do_gettimeofday)(const struct function *r, size_t size);
 111         const char *const *usage;
 112 };
 113
 114 static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t size, double size_total)
 115 {
 116         const struct function *r = &info->functions[r_idx];
 117         double result_bps = 0.0;
 118         u64 result_cycles = 0;
 119
 120         printf("# function '%s' (%s)\n", r->name, r->desc);
 121
 122         if (bench_format == BENCH_FORMAT_DEFAULT)
 123                 printf("# Copying %s bytes ...\n\n", size_str);
 124
 125         if (use_cycles) {
 126                 result_cycles = info->do_cycles(r, size);
 127         } else {
 128                 result_bps = info->do_gettimeofday(r, size);
 129         }
 130
 131         switch (bench_format) {
 132         case BENCH_FORMAT_DEFAULT:
 133                 if (use_cycles) {
 134                         printf(" %14lf cycles/byte\n", (double)result_cycles/size_total);
 135                 } else {
 136                         print_bps(result_bps);
 137                 }
 138                 break;
 139
 140         case BENCH_FORMAT_SIMPLE:
 141                 if (use_cycles) {
 142                         printf("%lf\n", (double)result_cycles/size_total);
 143                 } else {
 144                         printf("%lf\n", result_bps);
 145                 }
 146                 break;
 147
 148         default:
 149                 BUG_ON(1);
 150                 break;
 151         }
 152 }
 153
 154 static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *info)
 155 {
 156         int i;
 157         size_t size;
 158         double size_total;
 159
 160         argc = parse_options(argc, argv, options, info->usage, 0);
 161
 162         if (use_cycles) {
 163                 i = init_cycles();
 164                 if (i < 0) {
 165                         fprintf(stderr, "Failed to open cycles counter\n");
 166                         return i;
 167                 }
 168         }
 169
 170         size = (size_t)perf_atoll((char *)size_str);
 171         size_total = (double)size * nr_loops;
 172
 173         if ((s64)size <= 0) {
 174                 fprintf(stderr, "Invalid size:%s\n", size_str);
 175                 return 1;
 176         }
 177
 178         if (!strncmp(function_str, "all", 3)) {
 179                 for (i = 0; info->functions[i].name; i++)
 180                         __bench_mem_function(info, i, size, size_total);
 181                 return 0;
 182         }
 183
 184         for (i = 0; info->functions[i].name; i++) {
 185                 if (!strcmp(info->functions[i].name, function_str))
 186                         break;
 187         }
 188         if (!info->functions[i].name) {
 189                 if (strcmp(function_str, "help") && strcmp(function_str, "h"))
 190                         printf("Unknown function: %s\n", function_str);
 191                 printf("Available functions:\n");
 192                 for (i = 0; info->functions[i].name; i++) {
 193                         printf("\t%s ... %s\n",
 194                                info->functions[i].name, info->functions[i].desc);
 195                 }
 196                 return 1;
 197         }
 198
 199         __bench_mem_function(info, i, size, size_total);
 200
 201         return 0;
 202 }
 203
 204 static void memcpy_alloc_mem(void **dst, void **src, size_t size)
 205 {
 206         *dst = zalloc(size);
 207         if (!*dst)
 208                 die("memory allocation failed - maybe size is too large?\n");
 209
 210         *src = zalloc(size);
 211         if (!*src)
 212                 die("memory allocation failed - maybe size is too large?\n");
 213
 214         /* Make sure to always prefault zero pages even if MMAP_THRESH is crossed: */
 215         memset(*src, 0, size);
 216 }
 217
 218 static u64 do_memcpy_cycles(const struct function *r, size_t size)
 219 {
 220         u64 cycle_start = 0ULL, cycle_end = 0ULL;
 221         void *src = NULL, *dst = NULL;
 222         memcpy_t fn = r->fn.memcpy;
 223         int i;
 224
 225         memcpy_alloc_mem(&dst, &src, size);
 226
 227         /*
 228          * We prefault the freshly allocated memory range here,
 229          * to not measure page fault overhead:
 230          */
 231         fn(dst, src, size);
 232
 233         cycle_start = get_cycles();
 234         for (i = 0; i < nr_loops; ++i)
 235                 fn(dst, src, size);
 236         cycle_end = get_cycles();
 237
 238         free(src);
 239         free(dst);
 240         return cycle_end - cycle_start;
 241 }
 242
 243 static double do_memcpy_gettimeofday(const struct function *r, size_t size)
 244 {
 245         struct timeval tv_start, tv_end, tv_diff;
 246         memcpy_t fn = r->fn.memcpy;
 247         void *src = NULL, *dst = NULL;
 248         int i;
 249
 250         memcpy_alloc_mem(&dst, &src, size);
 251
 252         /*
 253          * We prefault the freshly allocated memory range here,
 254          * to not measure page fault overhead:
 255          */
 256         fn(dst, src, size);
 257
 258         BUG_ON(gettimeofday(&tv_start, NULL));
 259         for (i = 0; i < nr_loops; ++i)
 260                 fn(dst, src, size);
 261         BUG_ON(gettimeofday(&tv_end, NULL));
 262
 263         timersub(&tv_end, &tv_start, &tv_diff);
 264
 265         free(src);
 266         free(dst);
 267
 268         return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
 269 }
 270
 271 struct function memcpy_functions[] = {
 272         { .name         = "default",
 273           .desc         = "Default memcpy() provided by glibc",
 274           .fn.memcpy    = memcpy },
 275
 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"
 279 # undef MEMCPY_FN
 280 #endif
 281
 282         { .name = NULL, }
 283 };
 284
 285 static const char * const bench_mem_memcpy_usage[] = {
 286         "perf bench mem memcpy <options>",
 287         NULL
 288 };
 289
 290 int bench_mem_memcpy(int argc, const char **argv, const char *prefix __maybe_unused)
 291 {
 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,
 297         };
 298
 299         return bench_mem_common(argc, argv, &info);
 300 }
 301
 302 static void memset_alloc_mem(void **dst, size_t size)
 303 {
 304         *dst = zalloc(size);
 305         if (!*dst)
 306                 die("memory allocation failed - maybe size is too large?\n");
 307 }
 308
 309 static u64 do_memset_cycles(const struct function *r, size_t size)
 310 {
 311         u64 cycle_start = 0ULL, cycle_end = 0ULL;
 312         memset_t fn = r->fn.memset;
 313         void *dst = NULL;
 314         int i;
 315
 316         memset_alloc_mem(&dst, size);
 317
 318         /*
 319          * We prefault the freshly allocated memory range here,
 320          * to not measure page fault overhead:
 321          */
 322         fn(dst, -1, size);
 323
 324         cycle_start = get_cycles();
 325         for (i = 0; i < nr_loops; ++i)
 326                 fn(dst, i, size);
 327         cycle_end = get_cycles();
 328
 329         free(dst);
 330         return cycle_end - cycle_start;
 331 }
 332
 333 static double do_memset_gettimeofday(const struct function *r, size_t size)
 334 {
 335         struct timeval tv_start, tv_end, tv_diff;
 336         memset_t fn = r->fn.memset;
 337         void *dst = NULL;
 338         int i;
 339
 340         memset_alloc_mem(&dst, size);
 341
 342         /*
 343          * We prefault the freshly allocated memory range here,
 344          * to not measure page fault overhead:
 345          */
 346         fn(dst, -1, size);
 347
 348         BUG_ON(gettimeofday(&tv_start, NULL));
 349         for (i = 0; i < nr_loops; ++i)
 350                 fn(dst, i, size);
 351         BUG_ON(gettimeofday(&tv_end, NULL));
 352
 353         timersub(&tv_end, &tv_start, &tv_diff);
 354
 355         free(dst);
 356         return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
 357 }
 358
 359 static const char * const bench_mem_memset_usage[] = {
 360         "perf bench mem memset <options>",
 361         NULL
 362 };
 363
 364 static const struct function memset_functions[] = {
 365         { .name         = "default",
 366           .desc         = "Default memset() provided by glibc",
 367           .fn.memset    = memset },
 368
 369 #ifdef HAVE_ARCH_X86_64_SUPPORT
 370 # define MEMSET_FN(_fn, _name, _desc) { .name = _name, .desc = _desc, .fn.memset = _fn },
 371 # include "mem-memset-x86-64-asm-def.h"
 372 # undef MEMSET_FN
 373 #endif
 374
 375         { .name = NULL, }
 376 };
 377
 378 int bench_mem_memset(int argc, const char **argv, const char *prefix __maybe_unused)
 379 {
 380         struct bench_mem_info info = {
 381                 .functions              = memset_functions,
 382                 .do_cycles              = do_memset_cycles,
 383                 .do_gettimeofday        = do_memset_gettimeofday,
 384                 .usage                  = bench_mem_memset_usage,
 385         };
 386
 387         return bench_mem_common(argc, argv, &info);
 388 }