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 along
  21  * with this program; see the file COPYING; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  23  */
  24
  25 #include <zebra.h>
  26
  27 #include <stdio.h>
  28 #include <unistd.h>
  29
  30 #include "thread.h"
  31 #include "prng.h"
  32
  33 #define SCHEDULE_TIMERS 1000000
  34 #define REMOVE_TIMERS    500000
  35
  36 struct thread_master *master;
  37
  38 static void dummy_func(struct thread *thread)
  39 {
  40 }
  41
  42 int main(int argc, char **argv)
  43 {
  44         struct prng *prng;
  45         int i;
  46         struct thread **timers;
  47         struct timeval tv_start, tv_lap, tv_stop;
  48         unsigned long t_schedule, t_remove;
  49
  50         master = thread_master_create(NULL);
  51         prng = prng_new(0);
  52         timers = calloc(SCHEDULE_TIMERS, sizeof(*timers));
  53
  54         /* create thread structures so they won't be allocated during the
  55          * time measurement */
  56         for (i = 0; i < SCHEDULE_TIMERS; i++) {
  57                 thread_add_timer_msec(master, dummy_func, NULL, 0, &timers[i]);
  58         }
  59         for (i = 0; i < SCHEDULE_TIMERS; i++)
  60                 thread_cancel(&timers[i]);
  61
  62         monotime(&tv_start);
  63
  64         for (i = 0; i < SCHEDULE_TIMERS; i++) {
  65                 long interval_msec;
  66
  67                 interval_msec = prng_rand(prng) % (100 * SCHEDULE_TIMERS);
  68                 thread_add_timer_msec(master, dummy_func, NULL, interval_msec,
  69                                       &timers[i]);
  70         }
  71
  72         monotime(&tv_lap);
  73
  74         for (i = 0; i < REMOVE_TIMERS; i++) {
  75                 int index;
  76
  77                 index = prng_rand(prng) % SCHEDULE_TIMERS;
  78                 thread_cancel(&timers[index]);
  79         }
  80
  81         monotime(&tv_stop);
  82
  83         t_schedule = 1000 * (tv_lap.tv_sec - tv_start.tv_sec);
  84         t_schedule += (tv_lap.tv_usec - tv_start.tv_usec) / 1000;
  85
  86         t_remove = 1000 * (tv_stop.tv_sec - tv_lap.tv_sec);
  87         t_remove += (tv_stop.tv_usec - tv_lap.tv_usec) / 1000;
  88
  89         printf("Scheduling %d random timers took %lu.%03lu seconds.\n",
  90                SCHEDULE_TIMERS, t_schedule / 1000, t_schedule % 1000);
  91         printf("Removing %d random timers took %lu.%03lu seconds.\n",
  92                REMOVE_TIMERS, t_remove / 1000, t_remove % 1000);
  93         fflush(stdout);
  94
  95         free(timers);
  96         thread_master_free(master);
  97         prng_free(prng);
  98         return 0;
  99 }