apps/testapp/misctests.cpp

   1 /*
   2 ** Copyright 2004, Travis Geiselbrecht. All rights reserved.
   3 ** Distributed under the terms of the NewOS License.
   4 */
   5 #include <string.h>
   6 #include <stdio.h>
   7 #include <unistd.h>
   8 #include <sys/syscalls.h>
   9
  10 int syscall_bench(int arg)
  11 {
  12         bigtime_t start_time = _kern_system_time();
  13         int i;
  14         const int count = 250000;
  15
  16         for(i=0; i < count; i++) {
  17                 _kern_null();
  18         }
  19
  20         start_time = _kern_system_time() - start_time;
  21
  22         printf("took %Ld usecs to call _kern_null() %d times (%Ld usecs/call)\n",
  23                 start_time, count, start_time/count);
  24         printf("%Ld cycles/syscall on 500 Mhz cpu\n", start_time * 500 / count);
  25
  26         return 0;
  27 }