external/bsd/libevent/dist/test/bench.c

   1 /*      $NetBSD: bench.c,v 1.1.1.1 2013/04/11 16:43:32 christos Exp $   */
   2 /*
   3  * Copyright 2003-2007 Niels Provos <provos@citi.umich.edu>
   4  * Copyright 2007-2012 Niels Provos and Nick Mathewson
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 4. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  *
  29  * Mon 03/10/2003 - Modified by Davide Libenzi <davidel@xmailserver.org>
  30  *
  31  *     Added chain event propagation to improve the sensitivity of
  32  *     the measure respect to the event loop efficency.
  33  *
  34  *
  35  */
  36
  37 #include "event2/event-config.h"
  38 #include <sys/cdefs.h>
  39 __RCSID("$NetBSD: bench.c,v 1.1.1.1 2013/04/11 16:43:32 christos Exp $");
  40
  41 #include <sys/types.h>
  42 #include <sys/stat.h>
  43 #ifdef _EVENT_HAVE_SYS_TIME_H
  44 #include <sys/time.h>
  45 #endif
  46 #ifdef WIN32
  47 #define WIN32_LEAN_AND_MEAN
  48 #include <windows.h>
  49 #else
  50 #include <sys/socket.h>
  51 #include <signal.h>
  52 #include <sys/resource.h>
  53 #endif
  54 #include <fcntl.h>
  55 #include <stdlib.h>
  56 #include <stdio.h>
  57 #include <string.h>
  58 #ifdef _EVENT_HAVE_UNISTD_H
  59 #include <unistd.h>
  60 #endif
  61 #include <errno.h>
  62
  63 #include <event.h>
  64 #include <evutil.h>
  65
  66 static int count, writes, fired;
  67 static evutil_socket_t *pipes;
  68 static int num_pipes, num_active, num_writes;
  69 static struct event *events;
  70
  71
  72 static void
  73 read_cb(evutil_socket_t fd, short which, void *arg)
  74 {
  75         ev_intptr_t idx = (ev_intptr_t) arg, widx = idx + 1;
  76         u_char ch;
  77
  78         count += recv(fd, (char*)&ch, sizeof(ch), 0);
  79         if (writes) {
  80                 if (widx >= num_pipes)
  81                         widx -= num_pipes;
  82                 send(pipes[2 * widx + 1], "e", 1, 0);
  83                 writes--;
  84                 fired++;
  85         }
  86 }
  87
  88 static struct timeval *
  89 run_once(void)
  90 {
  91         evutil_socket_t *cp, space;
  92         long i;
  93         static struct timeval ts, te;
  94
  95         for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
  96                 if (event_initialized(&events[i]))
  97                         event_del(&events[i]);
  98                 event_set(&events[i], cp[0], EV_READ | EV_PERSIST, read_cb, (void *)(ev_intptr_t) i);
  99                 event_add(&events[i], NULL);
 100         }
 101
 102         event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
 103
 104         fired = 0;
 105         space = num_pipes / num_active;
 106         space = space * 2;
 107         for (i = 0; i < num_active; i++, fired++)
 108                 send(pipes[i * space + 1], "e", 1, 0);
 109
 110         count = 0;
 111         writes = num_writes;
 112         { int xcount = 0;
 113         evutil_gettimeofday(&ts, NULL);
 114         do {
 115                 event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
 116                 xcount++;
 117         } while (count != fired);
 118         evutil_gettimeofday(&te, NULL);
 119
 120         if (xcount != count) fprintf(stderr, "Xcount: %d, Rcount: %d\n", xcount, count);
 121         }
 122
 123         evutil_timersub(&te, &ts, &te);
 124
 125         return (&te);
 126 }
 127
 128 int
 129 main(int argc, char **argv)
 130 {
 131 #ifndef WIN32
 132         struct rlimit rl;
 133 #endif
 134         int i, c;
 135         struct timeval *tv;
 136         evutil_socket_t *cp;
 137
 138 #ifdef WIN32
 139         WSADATA WSAData;
 140         WSAStartup(0x101, &WSAData);
 141 #endif
 142         num_pipes = 100;
 143         num_active = 1;
 144         num_writes = num_pipes;
 145         while ((c = getopt(argc, argv, "n:a:w:")) != -1) {
 146                 switch (c) {
 147                 case 'n':
 148                         num_pipes = atoi(optarg);
 149                         break;
 150                 case 'a':
 151                         num_active = atoi(optarg);
 152                         break;
 153                 case 'w':
 154                         num_writes = atoi(optarg);
 155                         break;
 156                 default:
 157                         fprintf(stderr, "Illegal argument \"%c\"\n", c);
 158                         exit(1);
 159                 }
 160         }
 161
 162 #ifndef WIN32
 163         rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50;
 164         if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
 165                 perror("setrlimit");
 166                 exit(1);
 167         }
 168 #endif
 169
 170         events = calloc(num_pipes, sizeof(struct event));
 171         pipes = calloc(num_pipes * 2, sizeof(evutil_socket_t));
 172         if (events == NULL || pipes == NULL) {
 173                 perror("malloc");
 174                 exit(1);
 175         }
 176
 177         event_init();
 178
 179         for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
 180 #ifdef USE_PIPES
 181                 if (pipe(cp) == -1) {
 182 #else
 183                 if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
 184 #endif
 185                         perror("pipe");
 186                         exit(1);
 187                 }
 188         }
 189
 190         for (i = 0; i < 25; i++) {
 191                 tv = run_once();
 192                 if (tv == NULL)
 193                         exit(1);
 194                 fprintf(stdout, "%ld\n",
 195                         tv->tv_sec * 1000000L + tv->tv_usec);
 196         }
 197
 198         exit(0);
 199 }