src/tests/system/benchmarks/execbench.c

   1 /*
   2  * from ftp://ftp.netbsd.org/pub/NetBSD/misc/gmcgarry/bench/execbench.tar.gz
   3  */
   4 #define errx(x,y...) { fprintf(stderr, y); fprintf(stderr, "\n"); exit(x); }
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <sys/time.h>
   9 #include <unistd.h>
  10
  11 int
  12 main(int argc, char *argv[])
  13 {
  14         struct timeval before, after;
  15         unsigned long time, elapsed;
  16         char timestr[12], iterstr[12];
  17         char *timeptr, *countptr;
  18         int iter, count;
  19
  20         if (argc < 2)
  21                 errx(1, "Usage: %s iterations", argv[0]);
  22
  23         iter = atoi(argv[1]);
  24         if (iter > 0) {
  25                 gettimeofday(&before, NULL);
  26                 time = 1000000 * before.tv_sec + before.tv_usec;
  27                 sprintf(timestr,"%lu", time);
  28                 timeptr = timestr;
  29                 countptr = argv[1];
  30         } else {
  31                 iter = atoi(argv[2]);
  32                 timeptr = argv[3];
  33                 countptr = argv[4];
  34         }
  35
  36         if (iter != 0) {
  37                 iter--;
  38                 sprintf(iterstr, "%d", iter);
  39                 execl(argv[0], argv[0], "0", iterstr, timeptr, countptr, NULL);
  40                 errx(1, "execl failed");
  41         }
  42
  43         gettimeofday(&after, NULL);
  44         sscanf(argv[3],"%lu", &time);
  45         count = atoi(argv[4]);
  46         elapsed = 1000000 * after.tv_sec + after.tv_usec;
  47         elapsed -= time;
  48
  49         printf("time: %lu microseconds\n", elapsed / count);
  50
  51         return (1);
  52 }