test/cpuperf/cputest.c

   1 /*
   2  * cputest.c
   3  *
   4  *      WARNING!  Always test on a 100% idle system.  Note that some tests
   5  *      may return 0 or negative results, due to pipeline effects.
   6  *
   7  * $DragonFly: src/test/cpuperf/cputest.c,v 1.1 2004/02/09 18:08:54 dillon Exp $
   8  */
   9
  10 #include "blib.h"
  11
  12 extern char test_str[];
  13
  14 int junk;
  15
  16 int
  17 main(int ac, char **av)
  18 {
  19     int i;
  20     int ttl;
  21     int us1;
  22     int us2;
  23
  24     printf("CPUTEST %s\n", test_str);
  25     start_timing();
  26     for (i = 0; ; ++i) {
  27         test_load(&junk);
  28         if ((i & 65535) == 0 && get_timing() > 1000000)
  29             break;
  30     }
  31     ttl = i * 4;
  32     start_timing();
  33     for (i = 0; i < ttl; ++i) {
  34         test_dummy(&junk);
  35     }
  36     us1 = get_timing();
  37     start_timing();
  38     for (i = 0; i < ttl; ++i) {
  39         test_load(&junk);
  40     }
  41     us2 = get_timing();
  42     stop_timing2(ttl, us2 - us1, "instruction overhead:");
  43     return(0);
  44 }
  45