test/sysperf/memzero.c

   1 /*
   2  * memzero.c
   3  *
   4  * $DragonFly: src/test/sysperf/memzero.c,v 1.1 2004/04/29 16:14:53 dillon Exp $
   5  */
   6
   7 #include "blib.h"
   8
   9 int glob[16384];
  10
  11 void test_using(const char *ctl, char *buf, int bytes, void (*zerof)(void *d, size_t bytes));
  12
  13 extern void dozero1(void *d, size_t bytes);
  14 extern void dozero2(void *d, size_t bytes);
  15 extern void dozero3(void *d, size_t bytes);
  16 extern void dozero4(void *d, size_t bytes);
  17 extern void dozero5(void *d, size_t bytes);
  18 extern void dozero6(void *d, size_t bytes);
  19 extern void dozero7(void *d, size_t bytes);
  20 extern void fpcleanup(void);
  21
  22 int
  23 main(int ac, char **av)
  24 {
  25     int bytes;
  26     char *ptr;
  27     char *buf;
  28
  29     if (ac == 1) {
  30         fprintf(stderr, "%s bytes\n", av[0]);
  31         exit(1);
  32     }
  33
  34     bytes = strtol(av[1], &ptr, 0);
  35     switch(*ptr) {
  36     case 'k':
  37     case 'K':
  38         bytes *= 1024;
  39         break;
  40     case 'm':
  41     case 'M':
  42         bytes *= 1024 * 1024;
  43         break;
  44     case 'g':
  45     case 'G':
  46         bytes *= 1024 * 1024 * 1024;
  47         break;
  48     case 0:
  49         break;
  50     default:
  51         fprintf(stderr, "suffix '%s' not understood\n");
  52         exit(1);
  53     }
  54     if (bytes <= 0 && (bytes & 127)) {
  55         fprintf(stderr, "# of bytes must be a multiple of 128\n");
  56         exit(1);
  57     }
  58
  59     buf = mmap(NULL, bytes * 2, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANON, -1, 0);
  60     if (buf == MAP_FAILED) {
  61         perror("mmap/buffer");
  62         exit(1);
  63     }
  64     bzero(buf, bytes * 2);
  65
  66     test_using("bzero", buf, bytes, (void *)bzero);
  67     test_using("dozero1", buf, bytes, dozero1);
  68     test_using("dozero2", buf, bytes, dozero2);
  69     test_using("dozero3", buf, bytes, dozero3);
  70     test_using("dozero4", buf, bytes, dozero4);
  71     test_using("dozero5", buf, bytes, dozero5);
  72     test_using("dozero6", buf, bytes, dozero6);
  73     test_using("dozero7", buf, bytes, dozero7);
  74     return(0);
  75 }
  76
  77 void
  78 test_using(const char *ctl, char *buf, int bytes, void (*zerof)(void *d, size_t bytes))
  79 {
  80     int i;
  81     int loops;
  82     long long us;
  83
  84     start_timing();
  85     for (i = 0; (i & 31) || stop_timing(0, NULL) == 0; ++i) {
  86         zerof(buf, bytes);
  87     }
  88
  89     loops = i * 2;
  90     start_timing();
  91     for (i = loops - 1; i >= 0; --i) {
  92         zerof(buf, bytes);
  93     }
  94     fpcleanup();
  95     stop_timing(loops, ctl);
  96     us = get_timing();
  97     printf("%s %d %5.2f MBytes/sec\n", ctl, bytes,
  98         (double)loops * (double)bytes / (double)us);
  99 }