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 __thread struct timeval tv1;
  16 static __thread struct timeval tv2;
  17 static __thread 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, %8.0f loops/sec, %6.3fuS/loop\n",
  42         (double)us / 1000000.0,
  43         count,
  44         (double)count * 1e6 / (double)us,
  45         (double)us / (double)count
  46     );
  47
  48     tv1 = tv2;
  49
  50     return(0);
  51 }
  52
  53 int
  54 stop_timing2(long long count, long long us, const char *ctl, ...)
  55 {
  56     va_list va;
  57
  58     va_start(va, ctl);
  59     vfprintf(stderr, ctl, va);
  60     va_end(va);
  61
  62     fprintf(stderr, " %6.3fs %lld loops = %6.3fnS/loop\n",
  63         (double)us / 1000000.0,
  64         count,
  65         (double)us * 1000.0 / (double)count
  66     );
  67     return(0);
  68 }
  69
  70 long long
  71 get_timing(void)
  72 {
  73     return (last_us);
  74 }
  75
  76 void
  77 nop(void)
  78 {
  79 }