src/tests/system/benchmarks/memspeed.c

   1 /*
   2  * from ftp://ftp.netbsd.org/pub/NetBSD/misc/gmcgarry/bench/memspeed.c
   3  *
   4  *  Compilation:
   5  *
   6  *    gcc -O3 -fomit-frame-pointer memspeed.c -o memspeed
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <sys/times.h>
  13 #include <time.h>
  14 #include <sys/types.h>
  15
  16 #define KB              (1024)
  17 #define MB              (KB*KB)
  18
  19 #define TESTSIZE        (8*MB)
  20 #define LOOPSIZE        (256*MB)
  21
  22 int main(int argc, char *argv[])
  23 {
  24     u_long mb = TESTSIZE;
  25     u_long size, passes, d, i, j;
  26     volatile u_long *mem;
  27     struct tms tms;
  28     time_t start, stop;
  29
  30     switch (argc) {
  31         case 2:
  32             mb = atol(argv[1])*MB;
  33         case 1:
  34             break;
  35
  36         default:
  37             fprintf(stderr, "Usage: %s megabytes\n", argv[0]);
  38             exit(1);
  39             break;
  40     }
  41
  42     mem = malloc(mb);
  43
  44     fprintf(stderr, "*** MEMORY WRITE PERFORMANCE (%d MB LOOP) ***\n",
  45             LOOPSIZE/MB);
  46     for (size = 64; size <= mb; size <<= 1) {
  47         passes = LOOPSIZE/size;
  48         fprintf(stderr, "size = %9ld bytes: ", size);
  49         times(&tms);
  50         start = tms.tms_utime;
  51         for (i = 0; i < passes; i++)
  52             for (j = 0; j < size/sizeof(u_long); j += 16) {
  53                 mem[j] = 0; mem[j+1] = 0; mem[j+2] = 0; mem[j+3] = 0;
  54                 mem[j+4] = 0; mem[j+5] = 0; mem[j+6] = 0; mem[j+7] = 0;
  55                 mem[j+8] = 0; mem[j+9] = 0; mem[j+10] = 0; mem[j+11] = 0;
  56                 mem[j+12] = 0; mem[j+13] = 0; mem[j+14] = 0; mem[j+15] = 0;
  57             }
  58         times(&tms);
  59         stop = tms.tms_utime;
  60         fprintf(stderr, "%5.3f MB/s\n",
  61                 (double)(LOOPSIZE/MB)/(double)(stop-start)*(double)CLK_TCK);
  62     }
  63     fprintf(stderr, "*** MEMORY READ PERFORMANCE (%d MB LOOP) ***\n",
  64             LOOPSIZE/MB);
  65     for (size = 64; size <= mb; size <<= 1) {
  66         passes = LOOPSIZE/size;
  67         fprintf(stderr, "size = %9ld bytes: ", size);
  68         times(&tms);
  69         start = tms.tms_utime;
  70         for (i = 0; i < passes; i++)
  71             for (j = 0; j < size/sizeof(u_long); j += 16) {
  72                 d = mem[j]; d = mem[j+1]; d = mem[j+2]; d = mem[j+3];
  73                 d = mem[j+4]; d = mem[j+5]; d = mem[j+6]; d = mem[j+7];
  74                 d = mem[j+8]; d = mem[j+9]; d = mem[j+10]; d = mem[j+11];
  75                 d = mem[j+12]; d = mem[j+13]; d = mem[j+14]; d = mem[j+15];
  76             }
  77         times(&tms);
  78         stop = tms.tms_utime;
  79         fprintf(stderr, "%5.3f MB/s\n",
  80                 (double)(LOOPSIZE/MB)/(double)(stop-start)*(double)CLK_TCK);
  81     }
  82     exit(0);
  83 }