tools/perf/bench/mem-memcpy.c

   1 /*
   2  * mem-memcpy.c
   3  *
   4  * memcpy: Simple memory copy in various ways
   5  *
   6  * Written by Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
   7  */
   8 #include <ctype.h>
   9
  10 #include "../perf.h"
  11 #include "../util/util.h"
  12 #include "../util/parse-options.h"
  13 #include "../util/string.h"
  14 #include "../util/header.h"
  15 #include "bench.h"
  16
  17 #include <stdio.h>
  18 #include <stdlib.h>
  19 #include <string.h>
  20 #include <sys/time.h>
  21 #include <errno.h>
  22
  23 #define K 1024
  24
  25 static const char       *length_str     = "1MB";
  26 static const char       *routine        = "default";
  27 static int              use_clock       = 0;
  28 static int              clock_fd;
  29
  30 static const struct option options[] = {
  31         OPT_STRING('l', "length", &length_str, "1MB",
  32                     "Specify length of memory to copy. "
  33                     "available unit: B, MB, GB (upper and lower)"),
  34         OPT_STRING('r', "routine", &routine, "default",
  35                     "Specify routine to copy"),
  36         OPT_BOOLEAN('c', "clock", &use_clock,
  37                     "Use CPU clock for measuring"),
  38         OPT_END()
  39 };
  40
  41 struct routine {
  42         const char *name;
  43         const char *desc;
  44         void * (*fn)(void *dst, const void *src, size_t len);
  45 };
  46
  47 struct routine routines[] = {
  48         { "default",
  49           "Default memcpy() provided by glibc",
  50           memcpy },
  51         { NULL,
  52           NULL,
  53           NULL   }
  54 };
  55
  56 static const char * const bench_mem_memcpy_usage[] = {
  57         "perf bench mem memcpy <options>",
  58         NULL
  59 };
  60
  61 static struct perf_event_attr clock_attr = {
  62         .type           = PERF_TYPE_HARDWARE,
  63         .config         = PERF_COUNT_HW_CPU_CYCLES
  64 };
  65
  66 static void init_clock(void)
  67 {
  68         clock_fd = sys_perf_event_open(&clock_attr, getpid(), -1, -1, 0);
  69
  70         if (clock_fd < 0 && errno == ENOSYS)
  71                 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
  72         else
  73                 BUG_ON(clock_fd < 0);
  74 }
  75
  76 static u64 get_clock(void)
  77 {
  78         int ret;
  79         u64 clk;
  80
  81         ret = read(clock_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 +
  90                 (double)ts->tv_usec / (double)1000000;
  91 }
  92
  93 int bench_mem_memcpy(int argc, const char **argv,
  94                      const char *prefix __used)
  95 {
  96         int i;
  97         void *dst, *src;
  98         size_t length;
  99         double bps = 0.0;
 100         struct timeval tv_start, tv_end, tv_diff;
 101         u64 clock_start, clock_end, clock_diff;
 102
 103         clock_start = clock_end = clock_diff = 0ULL;
 104         argc = parse_options(argc, argv, options,
 105                              bench_mem_memcpy_usage, 0);
 106
 107         tv_diff.tv_sec = 0;
 108         tv_diff.tv_usec = 0;
 109         length = (size_t)perf_atoll((char *)length_str);
 110
 111         if ((s64)length <= 0) {
 112                 fprintf(stderr, "Invalid length:%s\n", length_str);
 113                 return 1;
 114         }
 115
 116         for (i = 0; routines[i].name; i++) {
 117                 if (!strcmp(routines[i].name, routine))
 118                         break;
 119         }
 120         if (!routines[i].name) {
 121                 printf("Unknown routine:%s\n", routine);
 122                 printf("Available routines...\n");
 123                 for (i = 0; routines[i].name; i++) {
 124                         printf("\t%s ... %s\n",
 125                                routines[i].name, routines[i].desc);
 126                 }
 127                 return 1;
 128         }
 129
 130         dst = zalloc(length);
 131         if (!dst)
 132                 die("memory allocation failed - maybe length is too large?\n");
 133
 134         src = zalloc(length);
 135         if (!src)
 136                 die("memory allocation failed - maybe length is too large?\n");
 137
 138         if (bench_format == BENCH_FORMAT_DEFAULT) {
 139                 printf("# Copying %s Bytes from %p to %p ...\n\n",
 140                        length_str, src, dst);
 141         }
 142
 143         if (use_clock) {
 144                 init_clock();
 145                 clock_start = get_clock();
 146         } else {
 147                 BUG_ON(gettimeofday(&tv_start, NULL));
 148         }
 149
 150         routines[i].fn(dst, src, length);
 151
 152         if (use_clock) {
 153                 clock_end = get_clock();
 154                 clock_diff = clock_end - clock_start;
 155         } else {
 156                 BUG_ON(gettimeofday(&tv_end, NULL));
 157                 timersub(&tv_end, &tv_start, &tv_diff);
 158                 bps = (double)((double)length / timeval2double(&tv_diff));
 159         }
 160
 161         switch (bench_format) {
 162         case BENCH_FORMAT_DEFAULT:
 163                 if (use_clock) {
 164                         printf(" %14lf Clock/Byte\n",
 165                                (double)clock_diff / (double)length);
 166                 } else {
 167                         if (bps < K)
 168                                 printf(" %14lf B/Sec\n", bps);
 169                         else if (bps < K * K)
 170                                 printf(" %14lfd KB/Sec\n", bps / 1024);
 171                         else if (bps < K * K * K)
 172                                 printf(" %14lf MB/Sec\n", bps / 1024 / 1024);
 173                         else {
 174                                 printf(" %14lf GB/Sec\n",
 175                                        bps / 1024 / 1024 / 1024);
 176                         }
 177                 }
 178                 break;
 179         case BENCH_FORMAT_SIMPLE:
 180                 if (use_clock) {
 181                         printf("%14lf\n",
 182                                (double)clock_diff / (double)length);
 183                 } else
 184                         printf("%lf\n", bps);
 185                 break;
 186         default:
 187                 /* reaching this means there's some disaster: */
 188                 die("unknown format: %d\n", bench_format);
 189                 break;
 190         }
 191
 192         return 0;
 193 }