test/sysperf/memzero.c

   1 /*
   2  * memzero.c
   3  */
   4
   5 #include "blib.h"
   6
   7 int glob[16384];
   8
   9 void test_using(const char *ctl, char *buf, int bytes, void (*zerof)(void *d, size_t bytes));
  10
  11 extern void dozero1(void *d, size_t bytes);
  12 extern void dozero2(void *d, size_t bytes);
  13 extern void dozero3(void *d, size_t bytes);
  14 extern void dozero4(void *d, size_t bytes);
  15 extern void dozero5(void *d, size_t bytes);
  16 extern void dozero6(void *d, size_t bytes);
  17 extern void dozero7(void *d, size_t bytes);
  18 extern void fpcleanup(void);
  19
  20 int
  21 main(int ac, char **av)
  22 {
  23     int bytes;
  24     char *ptr;
  25     char *buf;
  26
  27     if (ac == 1) {
  28         fprintf(stderr, "%s bytes\n", av[0]);
  29         exit(1);
  30     }
  31
  32     bytes = strtol(av[1], &ptr, 0);
  33     switch(*ptr) {
  34     case 'k':
  35     case 'K':
  36         bytes *= 1024;
  37         break;
  38     case 'm':
  39     case 'M':
  40         bytes *= 1024 * 1024;
  41         break;
  42     case 'g':
  43     case 'G':
  44         bytes *= 1024 * 1024 * 1024;
  45         break;
  46     case 0:
  47         break;
  48     default:
  49         fprintf(stderr, "suffix '%s' not understood\n", ptr);
  50         exit(1);
  51     }
  52     if (bytes <= 0 && (bytes & 127)) {
  53         fprintf(stderr, "# of bytes must be a multiple of 128\n");
  54         exit(1);
  55     }
  56
  57     buf = mmap(NULL, bytes * 2, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANON, -1, 0);
  58     if (buf == MAP_FAILED) {
  59         perror("mmap/buffer");
  60         exit(1);
  61     }
  62     bzero(buf, bytes * 2);
  63
  64     test_using("bzero", buf, bytes, (void *)bzero);
  65 #if 0
  66     test_using("dozero1", buf, bytes, dozero1);
  67     test_using("dozero2", buf, bytes, dozero2);
  68     test_using("dozero3", buf, bytes, dozero3);
  69     test_using("dozero4", buf, bytes, dozero4);
  70     test_using("dozero5", buf, bytes, dozero5);
  71     test_using("dozero6", buf, bytes, dozero6);
  72     test_using("dozero7", buf, bytes, dozero7);
  73 #endif
  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 #if 0
  95     fpcleanup();
  96 #endif
  97     stop_timing(loops, ctl);
  98     us = get_timing();
  99     printf("%s %d %5.2f MBytes/sec\n", ctl, bytes,
 100         (double)loops * (double)bytes / (double)us);
 101 }