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/header.h"
  14 #include "bench.h"
  15
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19 #include <sys/time.h>
  20 #include <errno.h>
  21
  22 #define K 1024
  23
  24 static const char       *length_str     = "1MB";
  25 static const char       *routine        = "default";
  26 static bool             use_clock       = false;
  27 static int              clock_fd;
  28
  29 static const struct option options[] = {
  30         OPT_STRING('l', "length", &length_str, "1MB",
  31                     "Specify length of memory to copy. "
  32                     "available unit: B, MB, GB (upper and lower)"),
  33         OPT_STRING('r', "routine", &routine, "default",
  34                     "Specify routine to copy"),
  35         OPT_BOOLEAN('c', "clock", &use_clock,
  36                     "Use CPU clock for measuring"),
  37         OPT_END()
  38 };
  39
  40 struct routine {
  41         const char *name;
  42         const char *desc;
  43         void * (*fn)(void *dst, const void *src, size_t len);
  44 };
  45
  46 struct routine routines[] = {
  47         { "default",
  48           "Default memcpy() provided by glibc",
  49           memcpy },
  50         { NULL,
  51           NULL,
  52           NULL   }
  53 };
  54
  55 static const char * const bench_mem_memcpy_usage[] = {
  56         "perf bench mem memcpy <options>",
  57         NULL
  58 };
  59
  60 static struct perf_event_attr clock_attr = {
  61         .type           = PERF_TYPE_HARDWARE,
  62         .config         = PERF_COUNT_HW_CPU_CYCLES
  63 };
  64
  65 static void init_clock(void)
  66 {
  67         clock_fd = sys_perf_event_open(&clock_attr, getpid(), -1, -1, 0);
  68
  69         if (clock_fd < 0 && errno == ENOSYS)
  70                 die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
  71         else
  72                 BUG_ON(clock_fd < 0);
  73 }
  74
  75 static u64 get_clock(void)
  76 {
  77         int ret;
  78         u64 clk;
  79
  80         ret = read(clock_fd, &clk, sizeof(u64));
  81         BUG_ON(ret != sizeof(u64));
  82
  83         return clk;
  84 }
  85
  86 static double timeval2double(struct timeval *ts)
  87 {
  88         return (double)ts->tv_sec +
  89                 (double)ts->tv_usec / (double)1000000;
  90 }
  91
  92 int bench_mem_memcpy(int argc, const char **argv,
  93                      const char *prefix __used)
  94 {
  95         int i;
  96         void *dst, *src;
  97         size_t length;
  98         double bps = 0.0;
  99         struct timeval tv_start, tv_end, tv_diff;
 100         u64 clock_start, clock_end, clock_diff;
 101
 102         clock_start = clock_end = clock_diff = 0ULL;
 103         argc = parse_options(argc, argv, options,
 104                              bench_mem_memcpy_usage, 0);
 105
 106         tv_diff.tv_sec = 0;
 107         tv_diff.tv_usec = 0;
 108         length = (size_t)perf_atoll((char *)length_str);
 109
 110         if ((s64)length <= 0) {
 111                 fprintf(stderr, "Invalid length:%s\n", length_str);
 112                 return 1;
 113         }
 114
 115         for (i = 0; routines[i].name; i++) {
 116                 if (!strcmp(routines[i].name, routine))
 117                         break;
 118         }
 119         if (!routines[i].name) {
 120                 printf("Unknown routine:%s\n", routine);
 121                 printf("Available routines...\n");
 122                 for (i = 0; routines[i].name; i++) {
 123                         printf("\t%s ... %s\n",
 124                                routines[i].name, routines[i].desc);
 125                 }
 126                 return 1;
 127         }
 128
 129         dst = zalloc(length);
 130         if (!dst)
 131                 die("memory allocation failed - maybe length is too large?\n");
 132
 133         src = zalloc(length);
 134         if (!src)
 135                 die("memory allocation failed - maybe length is too large?\n");
 136
 137         if (bench_format == BENCH_FORMAT_DEFAULT) {
 138                 printf("# Copying %s Bytes from %p to %p ...\n\n",
 139                        length_str, src, dst);
 140         }
 141
 142         if (use_clock) {
 143                 init_clock();
 144                 clock_start = get_clock();
 145         } else {
 146                 BUG_ON(gettimeofday(&tv_start, NULL));
 147         }
 148
 149         routines[i].fn(dst, src, length);
 150
 151         if (use_clock) {
 152                 clock_end = get_clock();
 153                 clock_diff = clock_end - clock_start;
 154         } else {
 155                 BUG_ON(gettimeofday(&tv_end, NULL));
 156                 timersub(&tv_end, &tv_start, &tv_diff);
 157                 bps = (double)((double)length / timeval2double(&tv_diff));
 158         }
 159
 160         switch (bench_format) {
 161         case BENCH_FORMAT_DEFAULT:
 162                 if (use_clock) {
 163                         printf(" %14lf Clock/Byte\n",
 164                                (double)clock_diff / (double)length);
 165                 } else {
 166                         if (bps < K)
 167                                 printf(" %14lf B/Sec\n", bps);
 168                         else if (bps < K * K)
 169                                 printf(" %14lfd KB/Sec\n", bps / 1024);
 170                         else if (bps < K * K * K)
 171                                 printf(" %14lf MB/Sec\n", bps / 1024 / 1024);
 172                         else {
 173                                 printf(" %14lf GB/Sec\n",
 174                                        bps / 1024 / 1024 / 1024);
 175                         }
 176                 }
 177                 break;
 178         case BENCH_FORMAT_SIMPLE:
 179                 if (use_clock) {
 180                         printf("%14lf\n",
 181                                (double)clock_diff / (double)length);
 182                 } else
 183                         printf("%lf\n", bps);
 184                 break;
 185         default:
 186                 /* reaching this means there's some disaster: */
 187                 die("unknown format: %d\n", bench_format);
 188                 break;
 189         }
 190
 191         return 0;
 192 }