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 static long long last_us;
  18
  19 void
  20 start_timing(void)
  21 {
  22     gettimeofday(&tv1, NULL);
  23 }
  24
  25 int
  26 stop_timing(long long count, const char *ctl, ...)
  27 {
  28     long long us;
  29     va_list va;
  30
  31     gettimeofday(&tv2, NULL);
  32     us = (tv2.tv_usec - tv1.tv_usec) + (tv2.tv_sec - tv1.tv_sec) * 1000000LL;
  33     last_us = us;
  34     if (ctl == NULL)    /* dummy call to pre-cache */
  35         return(us > 1000000);
  36
  37     va_start(va, ctl);
  38     vfprintf(stderr, ctl, va);
  39     va_end(va);
  40
  41     fprintf(stderr, " %6.3fs %lld loops = %6.3fuS/loop\n",
  42         (double)us / 1000000.0,
  43         count,
  44         (double)us / (double)count
  45     );
  46
  47     tv1 = tv2;
  48
  49     return(0);
  50 }
  51
  52 int
  53 stop_timing2(long long count, long long us, const char *ctl, ...)
  54 {
  55     va_list va;
  56
  57     va_start(va, ctl);
  58     vfprintf(stderr, ctl, va);
  59     va_end(va);
  60
  61     fprintf(stderr, " %6.3fs %lld loops = %6.3fnS/loop\n",
  62         (double)us / 1000000.0,
  63         count,
  64         (double)us * 1000.0 / (double)count
  65     );
  66     return(0);
  67 }
  68
  69 long long
  70 get_timing(void)
  71 {
  72     return (last_us);
  73 }
  74
  75 void
  76 nop(void)
  77 {
  78 }