tests/lib/test_timer_performance.c

   1 /*
   2  * Test program which measures the time it takes to schedule and
   3  * remove timers.
   4  *
   5  * Copyright (C) 2013 by Open Source Routing.
   6  * Copyright (C) 2013 by Internet Systems Consortium, Inc. ("ISC")
   7  *
   8  * This file is part of Quagga
   9  *
  10  * Quagga is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the
  12  * Free Software Foundation; either version 2, or (at your option) any
  13  * later version.
  14  *
  15  * Quagga is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with Quagga; see the file COPYING.  If not, write to the Free
  22  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  23  * 02111-1307, USA.
  24  */
  25
  26 #include <zebra.h>
  27
  28 #include <stdio.h>
  29 #include <unistd.h>
  30
  31 #include "thread.h"
  32 #include "pqueue.h"
  33 #include "prng.h"
  34
  35 #define SCHEDULE_TIMERS 1000000
  36 #define REMOVE_TIMERS    500000
  37
  38 struct thread_master *master;
  39
  40 static int dummy_func(struct thread *thread)
  41 {
  42   return 0;
  43 }
  44
  45 int main(int argc, char **argv)
  46 {
  47   struct prng *prng;
  48   int i;
  49   struct thread **timers;
  50   struct timeval tv_start, tv_lap, tv_stop;
  51   unsigned long t_schedule, t_remove;
  52
  53   master = thread_master_create();
  54   prng = prng_new(0);
  55   timers = calloc(SCHEDULE_TIMERS, sizeof(*timers));
  56
  57   /* create thread structures so they won't be allocated during the
  58    * time measurement */
  59   for (i = 0; i < SCHEDULE_TIMERS; i++) {
  60     timers[i] = NULL;
  61     thread_add_timer_msec(master, dummy_func, NULL, 0, &timers[i]);
  62   }
  63   for (i = 0; i < SCHEDULE_TIMERS; i++)
  64     thread_cancel(timers[i]);
  65
  66   monotime(&tv_start);
  67
  68   for (i = 0; i < SCHEDULE_TIMERS; i++)
  69     {
  70       long interval_msec;
  71
  72       interval_msec = prng_rand(prng) % (100 * SCHEDULE_TIMERS);
  73       timers[i] = NULL;
  74       thread_add_timer_msec(master, dummy_func, NULL, interval_msec,
  75                             &timers[i]);
  76     }
  77
  78   monotime(&tv_lap);
  79
  80   for (i = 0; i < REMOVE_TIMERS; i++)
  81     {
  82       int index;
  83
  84       index = prng_rand(prng) % SCHEDULE_TIMERS;
  85       if (timers[index])
  86         thread_cancel(timers[index]);
  87       timers[index] = NULL;
  88     }
  89
  90   monotime(&tv_stop);
  91
  92   t_schedule = 1000 * (tv_lap.tv_sec - tv_start.tv_sec);
  93   t_schedule += (tv_lap.tv_usec - tv_start.tv_usec) / 1000;
  94
  95   t_remove = 1000 * (tv_stop.tv_sec - tv_lap.tv_sec);
  96   t_remove += (tv_stop.tv_usec - tv_lap.tv_usec) / 1000;
  97
  98   printf("Scheduling %d random timers took %ld.%03ld seconds.\n",
  99          SCHEDULE_TIMERS, t_schedule/1000, t_schedule%1000);
 100   printf("Removing %d random timers took %ld.%03ld seconds.\n",
 101          REMOVE_TIMERS, t_remove/1000, t_remove%1000);
 102   fflush(stdout);
 103
 104   free(timers);
 105   thread_master_free(master);
 106   prng_free(prng);
 107   return 0;
 108 }