test/sysperf/blib.c

   1 /*
   2  * BLIB.C
   3  *
   4  * Simple benchmarking library
   5  *
   6  * $DragonFly: src/test/sysperf/blib.c,v 1.6 2007/08/21 19:23:46 corecode Exp $
   7  */
   8
   9 #include <sys/types.h>
  10 #include <sys/time.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <stdarg.h>
  14
  15 static struct timeval tv1;
  16 static struct timeval tv2;
  17
  18 void
  19 start_timing(void)
  20 {
  21     gettimeofday(&tv1, NULL);
  22 }
  23
  24 int
  25 stop_timing(long long count, const char *ctl, ...)
  26 {
  27     long long us;
  28     va_list va;
  29
  30     gettimeofday(&tv2, NULL);
  31     us = (tv2.tv_usec - tv1.tv_usec) + (tv2.tv_sec - tv1.tv_sec) * 1000000LL;
  32     if (ctl == NULL)    /* dummy call to pre-cache */
  33         return(us > 1000000);
  34
  35     va_start(va, ctl);
  36     vfprintf(stderr, ctl, va);
  37     va_end(va);
  38
  39     fprintf(stderr, " %6.3fs %lld loops = %6.3fuS/loop\n",
  40         (double)us / 1000000.0,
  41         count,
  42         (double)us / (double)count
  43     );
  44     return(0);
  45 }
  46
  47 int
  48 stop_timing2(long long count, long long us, const char *ctl, ...)
  49 {
  50     va_list va;
  51
  52     va_start(va, ctl);
  53     vfprintf(stderr, ctl, va);
  54     va_end(va);
  55
  56     fprintf(stderr, " %6.3fs %lld loops = %6.3fnS/loop\n",
  57         (double)us / 1000000.0,
  58         count,
  59         (double)us * 1000.0 / (double)count
  60     );
  61     return(0);
  62 }
  63
  64 long long
  65 get_timing(void)
  66 {
  67     long long us;
  68
  69     gettimeofday(&tv2, NULL);
  70     us = (tv2.tv_usec - tv1.tv_usec) + (tv2.tv_sec - tv1.tv_sec) * 1000000LL;
  71     return(us);
  72 }
  73
  74 void
  75 nop(void)
  76 {
  77 }