tests/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 #include <stdio.h>
  26 #include <unistd.h>
  27
  28 #include <zebra.h>
  29
  30 #include "thread.h"
  31 #include "pqueue.h"
  32 #include "prng.h"
  33
  34 #define SCHEDULE_TIMERS 1000000
  35 #define REMOVE_TIMERS    500000
  36
  37 struct thread_master *master;
  38
  39 static int dummy_func(struct thread *thread)
  40 {
  41   return 0;
  42 }
  43
  44 int main(int argc, char **argv)
  45 {
  46   struct prng *prng;
  47   int i;
  48   struct thread **timers;
  49   struct timeval tv_start, tv_lap, tv_stop;
  50   unsigned long t_schedule, t_remove;
  51
  52   master = thread_master_create();
  53   prng = prng_new(0);
  54   timers = calloc(SCHEDULE_TIMERS, sizeof(*timers));
  55
  56   /* create thread structures so they won't be allocated during the
  57    * time measurement */
  58   for (i = 0; i < SCHEDULE_TIMERS; i++)
  59     timers[i] = thread_add_timer_msec(master, dummy_func, NULL, 0);
  60   for (i = 0; i < SCHEDULE_TIMERS; i++)
  61     thread_cancel(timers[i]);
  62
  63   quagga_gettime(QUAGGA_CLK_MONOTONIC, &tv_start);
  64
  65   for (i = 0; i < SCHEDULE_TIMERS; i++)
  66     {
  67       long interval_msec;
  68
  69       interval_msec = prng_rand(prng) % (100 * SCHEDULE_TIMERS);
  70       timers[i] = thread_add_timer_msec(master, dummy_func,
  71                                         NULL, interval_msec);
  72     }
  73
  74   quagga_gettime(QUAGGA_CLK_MONOTONIC, &tv_lap);
  75
  76   for (i = 0; i < REMOVE_TIMERS; i++)
  77     {
  78       int index;
  79
  80       index = prng_rand(prng) % SCHEDULE_TIMERS;
  81       if (timers[index])
  82         thread_cancel(timers[index]);
  83       timers[index] = NULL;
  84     }
  85
  86   quagga_gettime(QUAGGA_CLK_MONOTONIC, &tv_stop);
  87
  88   t_schedule = 1000 * (tv_lap.tv_sec - tv_start.tv_sec);
  89   t_schedule += (tv_lap.tv_usec - tv_start.tv_usec) / 1000;
  90
  91   t_remove = 1000 * (tv_stop.tv_sec - tv_lap.tv_sec);
  92   t_remove += (tv_stop.tv_usec - tv_lap.tv_usec) / 1000;
  93
  94   printf("Scheduling %d random timers took %ld.%03ld seconds.\n",
  95          SCHEDULE_TIMERS, t_schedule/1000, t_schedule%1000);
  96   printf("Removing %d random timers took %ld.%03ld seconds.\n",
  97          REMOVE_TIMERS, t_remove/1000, t_remove%1000);
  98   fflush(stdout);
  99
 100   free(timers);
 101   thread_master_free(master);
 102   prng_free(prng);
 103   return 0;
 104 }