tests/cpuwaster.c

   1 #include "../../lib/include/timelib.h"
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <string.h>
   5
   6 int syntax() {
   7         puts("prog seconds_of_cpu_time_to_burn");
   8         return 1;
   9 }
  10
  11 long parse_human_number(char* num) {
  12         long ret = 0;
  13         char buf[64];
  14         if(!num) return 0;
  15         size_t l = strlen(num);
  16
  17         if(l && l < sizeof(buf)) {
  18                 if(num[l -1] == 'G')
  19                         ret = 1024 * 1024 * 1024;
  20                 else if(num[l -1] == 'M')
  21                         ret = 1024 * 1024;
  22                 else if(num[l -1] == 'K')
  23                         ret = 1024;
  24                 if(ret) {
  25                         memcpy(buf, num, l);
  26                         buf[l] = 0;
  27                         return atol(buf) * ret;
  28                 }
  29                 return atol(num);
  30         }
  31         return ret;
  32 }
  33
  34 int main(int argc, char** argv) {
  35         void* buf;
  36         long waste_secs;
  37         struct timeval start;
  38         if (argc != 2) return syntax();
  39         waste_secs = parse_human_number(argv[1]);
  40         gettimestamp(&start);
  41
  42         while(mspassed(&start) < waste_secs * 1000) {}
  43
  44         printf("successfully wasted %ld seconds of your cpu time\n", waste_secs);
  45         return 0;
  46 }