third_party/libevent/test/bench.c

   1 /*
   2  * Copyright 2003 Niels Provos <provos@citi.umich.edu>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  *
  27  *
  28  * Mon 03/10/2003 - Modified by Davide Libenzi <davidel@xmailserver.org>
  29  *
  30  *     Added chain event propagation to improve the sensitivity of
  31  *     the measure respect to the event loop efficency.
  32  *
  33  *
  34  */
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include "config.h"
  38 #endif
  39
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42 #include <sys/time.h>
  43 #ifdef WIN32
  44 #include <windows.h>
  45 #else
  46 #include <sys/socket.h>
  47 #include <signal.h>
  48 #include <sys/resource.h>
  49 #endif
  50 #include <fcntl.h>
  51 #include <stdlib.h>
  52 #include <stdio.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55 #include <errno.h>
  56
  57 #include <event.h>
  58 #include <evutil.h>
  59
  60
  61 static int count, writes, fired;
  62 static int *pipes;
  63 static int num_pipes, num_active, num_writes;
  64 static struct event *events;
  65
  66 static void
  67 read_cb(int fd, short which, void *arg)
  68 {
  69         long idx = (long) arg, widx = idx + 1;
  70         u_char ch;
  71
  72         count += read(fd, &ch, sizeof(ch));
  73         if (writes) {
  74                 if (widx >= num_pipes)
  75                         widx -= num_pipes;
  76                 write(pipes[2 * widx + 1], "e", 1);
  77                 writes--;
  78                 fired++;
  79         }
  80 }
  81
  82 static struct timeval *
  83 run_once(void)
  84 {
  85         int *cp, space;
  86         long i;
  87         static struct timeval ts, te;
  88
  89         for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
  90                 event_del(&events[i]);
  91                 event_set(&events[i], cp[0], EV_READ | EV_PERSIST, read_cb, (void *) i);
  92                 event_add(&events[i], NULL);
  93         }
  94
  95         event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
  96
  97         fired = 0;
  98         space = num_pipes / num_active;
  99         space = space * 2;
 100         for (i = 0; i < num_active; i++, fired++)
 101                 write(pipes[i * space + 1], "e", 1);
 102
 103         count = 0;
 104         writes = num_writes;
 105         { int xcount = 0;
 106         gettimeofday(&ts, NULL);
 107         do {
 108                 event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
 109                 xcount++;
 110         } while (count != fired);
 111         gettimeofday(&te, NULL);
 112
 113         if (xcount != count) fprintf(stderr, "Xcount: %d, Rcount: %d\n", xcount, count);
 114         }
 115
 116         evutil_timersub(&te, &ts, &te);
 117
 118         return (&te);
 119 }
 120
 121 int
 122 main (int argc, char **argv)
 123 {
 124 #ifndef WIN32
 125         struct rlimit rl;
 126 #endif
 127         int i, c;
 128         struct timeval *tv;
 129         int *cp;
 130
 131         num_pipes = 100;
 132         num_active = 1;
 133         num_writes = num_pipes;
 134         while ((c = getopt(argc, argv, "n:a:w:")) != -1) {
 135                 switch (c) {
 136                 case 'n':
 137                         num_pipes = atoi(optarg);
 138                         break;
 139                 case 'a':
 140                         num_active = atoi(optarg);
 141                         break;
 142                 case 'w':
 143                         num_writes = atoi(optarg);
 144                         break;
 145                 default:
 146                         fprintf(stderr, "Illegal argument \"%c\"\n", c);
 147                         exit(1);
 148                 }
 149         }
 150
 151 #ifndef WIN32
 152         rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50;
 153         if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
 154                 perror("setrlimit");
 155                 exit(1);
 156         }
 157 #endif
 158
 159         events = calloc(num_pipes, sizeof(struct event));
 160         pipes = calloc(num_pipes * 2, sizeof(int));
 161         if (events == NULL || pipes == NULL) {
 162                 perror("malloc");
 163                 exit(1);
 164         }
 165
 166         event_init();
 167
 168         for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
 169 #ifdef USE_PIPES
 170                 if (pipe(cp) == -1) {
 171 #else
 172                 if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
 173 #endif
 174                         perror("pipe");
 175                         exit(1);
 176                 }
 177         }
 178
 179         for (i = 0; i < 25; i++) {
 180                 tv = run_once();
 181                 if (tv == NULL)
 182                         exit(1);
 183                 fprintf(stdout, "%ld\n",
 184                         tv->tv_sec * 1000000L + tv->tv_usec);
 185         }
 186
 187         exit(0);
 188 }