tools/perf/bench/mem-functions.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * mem-memcpy.c
   4  *
   5  * Simple memcpy() and memset() benchmarks
   6  *
   7  * Written by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
   8  */
   9
  10 #include "debug.h"
  11 #include "../perf.h"
  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"
  17 #include "bench.h"
  18 #include "mem-memcpy-arch.h"
  19 #include "mem-memset-arch.h"
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <sys/time.h>
  25 #include <errno.h>
  26 #include <linux/time64.h>
  27
  28 #define K 1024
  29
  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;
  34 static int              cycles_fd;
  35
  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)"),
  40
  41         OPT_STRING('f', "function", &function_str, "all",
  42                     "Specify the function to run, \"all\" runs all available functions, \"help\" lists them"),
  43
  44         OPT_INTEGER('l', "nr_loops", &nr_loops,
  45                     "Specify the number of loops to run. (default: 1)"),
  46
  47         OPT_BOOLEAN('c', "cycles", &use_cycles,
  48                     "Use a cycles event instead of gettimeofday() to measure performance"),
  49
  50         OPT_END()
  51 };
  52
  53 typedef void *(*memcpy_t)(void *, const void *, size_t);
  54 typedef void *(*memset_t)(void *, int, size_t);
  55
  56 struct function {
  57         const char *name;
  58         const char *desc;
  59         union {
  60                 memcpy_t memcpy;
  61                 memset_t memset;
  62         } fn;
  63 };
  64
  65 static struct perf_event_attr cycle_attr = {
  66         .type           = PERF_TYPE_HARDWARE,
  67         .config         = PERF_COUNT_HW_CPU_CYCLES
  68 };
  69
  70 static int init_cycles(void)
  71 {
  72         cycles_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1, perf_event_open_cloexec_flag());
  73
  74         if (cycles_fd < 0 && errno == ENOSYS) {
  75                 pr_debug("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
  76                 return -1;
  77         }
  78
  79         return cycles_fd;
  80 }
  81
  82 static u64 get_cycles(void)
  83 {
  84         int ret;
  85         u64 clk;
  86
  87         ret = read(cycles_fd, &clk, sizeof(u64));
  88         BUG_ON(ret != sizeof(u64));
  89
  90         return clk;
  91 }
  92
  93 static double timeval2double(struct timeval *ts)
  94 {
  95         return (double)ts->tv_sec + (double)ts->tv_usec / (double)USEC_PER_SEC;
  96 }
  97
  98 #define print_bps(x) do {                                               \
  99                 if (x < K)                                              \
 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);           \
 105                 else                                                    \
 106                         printf(" %14lf GB/sec\n", x / K / K / K);       \
 107         } while (0)
 108
 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;
 114         bool alloc_src;
 115 };
 116
 117 static void __bench_mem_function(struct bench_mem_info *info, int r_idx, size_t size, double size_total)
 118 {
 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);
 123
 124         printf("# function '%s' (%s)\n", r->name, r->desc);
 125
 126         if (dst == NULL)
 127                 goto out_alloc_failed;
 128
 129         if (info->alloc_src) {
 130                 src = zalloc(size);
 131                 if (src == NULL)
 132                         goto out_alloc_failed;
 133         }
 134
 135         if (bench_format == BENCH_FORMAT_DEFAULT)
 136                 printf("# Copying %s bytes ...\n\n", size_str);
 137
 138         if (use_cycles) {
 139                 result_cycles = info->do_cycles(r, size, src, dst);
 140         } else {
 141                 result_bps = info->do_gettimeofday(r, size, src, dst);
 142         }
 143
 144         switch (bench_format) {
 145         case BENCH_FORMAT_DEFAULT:
 146                 if (use_cycles) {
 147                         printf(" %14lf cycles/byte\n", (double)result_cycles/size_total);
 148                 } else {
 149                         print_bps(result_bps);
 150                 }
 151                 break;
 152
 153         case BENCH_FORMAT_SIMPLE:
 154                 if (use_cycles) {
 155                         printf("%lf\n", (double)result_cycles/size_total);
 156                 } else {
 157                         printf("%lf\n", result_bps);
 158                 }
 159                 break;
 160
 161         default:
 162                 BUG_ON(1);
 163                 break;
 164         }
 165
 166 out_free:
 167         free(src);
 168         free(dst);
 169         return;
 170 out_alloc_failed:
 171         printf("# Memory allocation failed - maybe size (%s) is too large?\n", size_str);
 172         goto out_free;
 173 }
 174
 175 static int bench_mem_common(int argc, const char **argv, struct bench_mem_info *info)
 176 {
 177         int i;
 178         size_t size;
 179         double size_total;
 180
 181         argc = parse_options(argc, argv, options, info->usage, 0);
 182
 183         if (use_cycles) {
 184                 i = init_cycles();
 185                 if (i < 0) {
 186                         fprintf(stderr, "Failed to open cycles counter\n");
 187                         return i;
 188                 }
 189         }
 190
 191         size = (size_t)perf_atoll((char *)size_str);
 192         size_total = (double)size * nr_loops;
 193
 194         if ((s64)size <= 0) {
 195                 fprintf(stderr, "Invalid size:%s\n", size_str);
 196                 return 1;
 197         }
 198
 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);
 202                 return 0;
 203         }
 204
 205         for (i = 0; info->functions[i].name; i++) {
 206                 if (!strcmp(info->functions[i].name, function_str))
 207                         break;
 208         }
 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);
 216                 }
 217                 return 1;
 218         }
 219
 220         __bench_mem_function(info, i, size, size_total);
 221
 222         return 0;
 223 }
 224
 225 static u64 do_memcpy_cycles(const struct function *r, size_t size, void *src, void *dst)
 226 {
 227         u64 cycle_start = 0ULL, cycle_end = 0ULL;
 228         memcpy_t fn = r->fn.memcpy;
 229         int i;
 230
 231         /* Make sure to always prefault zero pages even if MMAP_THRESH is crossed: */
 232         memset(src, 0, size);
 233
 234         /*
 235          * We prefault the freshly allocated memory range here,
 236          * to not measure page fault overhead:
 237          */
 238         fn(dst, src, size);
 239
 240         cycle_start = get_cycles();
 241         for (i = 0; i < nr_loops; ++i)
 242                 fn(dst, src, size);
 243         cycle_end = get_cycles();
 244
 245         return cycle_end - cycle_start;
 246 }
 247
 248 static double do_memcpy_gettimeofday(const struct function *r, size_t size, void *src, void *dst)
 249 {
 250         struct timeval tv_start, tv_end, tv_diff;
 251         memcpy_t fn = r->fn.memcpy;
 252         int i;
 253
 254         /*
 255          * We prefault the freshly allocated memory range here,
 256          * to not measure page fault overhead:
 257          */
 258         fn(dst, src, size);
 259
 260         BUG_ON(gettimeofday(&tv_start, NULL));
 261         for (i = 0; i < nr_loops; ++i)
 262                 fn(dst, src, size);
 263         BUG_ON(gettimeofday(&tv_end, NULL));
 264
 265         timersub(&tv_end, &tv_start, &tv_diff);
 266
 267         return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
 268 }
 269
 270 struct function memcpy_functions[] = {
 271         { .name         = "default",
 272           .desc         = "Default memcpy() provided by glibc",
 273           .fn.memcpy    = memcpy },
 274
 275 #ifdef HAVE_ARCH_X86_64_SUPPORT
 276 # define MEMCPY_FN(_fn, _name, _desc) {.name = _name, .desc = _desc, .fn.memcpy = _fn},
 277 # include "mem-memcpy-x86-64-asm-def.h"
 278 # undef MEMCPY_FN
 279 #endif
 280
 281         { .name = NULL, }
 282 };
 283
 284 static const char * const bench_mem_memcpy_usage[] = {
 285         "perf bench mem memcpy <options>",
 286         NULL
 287 };
 288
 289 int bench_mem_memcpy(int argc, const char **argv)
 290 {
 291         struct bench_mem_info info = {
 292                 .functions              = memcpy_functions,
 293                 .do_cycles              = do_memcpy_cycles,
 294                 .do_gettimeofday        = do_memcpy_gettimeofday,
 295                 .usage                  = bench_mem_memcpy_usage,
 296                 .alloc_src              = true,
 297         };
 298
 299         return bench_mem_common(argc, argv, &info);
 300 }
 301
 302 static u64 do_memset_cycles(const struct function *r, size_t size, void *src __maybe_unused, void *dst)
 303 {
 304         u64 cycle_start = 0ULL, cycle_end = 0ULL;
 305         memset_t fn = r->fn.memset;
 306         int i;
 307
 308         /*
 309          * We prefault the freshly allocated memory range here,
 310          * to not measure page fault overhead:
 311          */
 312         fn(dst, -1, size);
 313
 314         cycle_start = get_cycles();
 315         for (i = 0; i < nr_loops; ++i)
 316                 fn(dst, i, size);
 317         cycle_end = get_cycles();
 318
 319         return cycle_end - cycle_start;
 320 }
 321
 322 static double do_memset_gettimeofday(const struct function *r, size_t size, void *src __maybe_unused, void *dst)
 323 {
 324         struct timeval tv_start, tv_end, tv_diff;
 325         memset_t fn = r->fn.memset;
 326         int i;
 327
 328         /*
 329          * We prefault the freshly allocated memory range here,
 330          * to not measure page fault overhead:
 331          */
 332         fn(dst, -1, size);
 333
 334         BUG_ON(gettimeofday(&tv_start, NULL));
 335         for (i = 0; i < nr_loops; ++i)
 336                 fn(dst, i, size);
 337         BUG_ON(gettimeofday(&tv_end, NULL));
 338
 339         timersub(&tv_end, &tv_start, &tv_diff);
 340
 341         return (double)(((double)size * nr_loops) / timeval2double(&tv_diff));
 342 }
 343
 344 static const char * const bench_mem_memset_usage[] = {
 345         "perf bench mem memset <options>",
 346         NULL
 347 };
 348
 349 static const struct function memset_functions[] = {
 350         { .name         = "default",
 351           .desc         = "Default memset() provided by glibc",
 352           .fn.memset    = memset },
 353
 354 #ifdef HAVE_ARCH_X86_64_SUPPORT
 355 # define MEMSET_FN(_fn, _name, _desc) { .name = _name, .desc = _desc, .fn.memset = _fn },
 356 # include "mem-memset-x86-64-asm-def.h"
 357 # undef MEMSET_FN
 358 #endif
 359
 360         { .name = NULL, }
 361 };
 362
 363 int bench_mem_memset(int argc, const char **argv)
 364 {
 365         struct bench_mem_info info = {
 366                 .functions              = memset_functions,
 367                 .do_cycles              = do_memset_cycles,
 368                 .do_gettimeofday        = do_memset_gettimeofday,
 369                 .usage                  = bench_mem_memset_usage,
 370         };
 371
 372         return bench_mem_common(argc, argv, &info);
 373 }