tests/benchmark/test_cycles_per_loop.c

   1 // SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   2 //
   3 // SPDX-License-Identifier: GPL-2.0-or-later
   4
   5 /*
   6  * Userspace RCU library - test cycles per loop
   7  */
   8
   9 #include <urcu/arch.h>
  10 #include <stdio.h>
  11
  12 #define NR_LOOPS 1000000UL
  13
  14 static inline void loop_sleep(unsigned long loops)
  15 {
  16         while (loops-- != 0)
  17                 caa_cpu_relax();
  18 }
  19
  20 int main()
  21 {
  22         caa_cycles_t time1, time2;
  23
  24         time1 = caa_get_cycles();
  25         loop_sleep(NR_LOOPS);
  26         time2 = caa_get_cycles();
  27         printf("CPU clock cycles per loop: %g\n", (time2 - time1) /
  28                                                   (double)NR_LOOPS);
  29         return 0;
  30 }