root/opal/mca/event/libevent2022/libevent/test/bench.c

DEFINITIONS

1. read_cb
2. run_once
3. main

   1 /*
   2  * Copyright 2003-2007 Niels Provos <provos@citi.umich.edu>
   3  * Copyright 2007-2012 Niels Provos and Nick Mathewson
   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 #include "event2/event-config.h"
  37 
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #ifdef _EVENT_HAVE_SYS_TIME_H
  41 #include <sys/time.h>
  42 #endif
  43 #ifdef WIN32
  44 #define WIN32_LEAN_AND_MEAN
  45 #include <windows.h>
  46 #else
  47 #include <sys/socket.h>
  48 #include <signal.h>
  49 #include <sys/resource.h>
  50 #endif
  51 #include <fcntl.h>
  52 #include <stdlib.h>
  53 #include <stdio.h>
  54 #include <string.h>
  55 #ifdef _EVENT_HAVE_UNISTD_H
  56 #include <unistd.h>
  57 #endif
  58 #include <errno.h>
  59 
  60 #include <event.h>
  61 #include <evutil.h>
  62 
  63 static int count, writes, fired;
  64 static evutil_socket_t *pipes;
  65 static int num_pipes, num_active, num_writes;
  66 static struct event *events;
  67 
  68 
  69 static void
  70 read_cb(evutil_socket_t fd, short which, void *arg)
  71 {
  72         ev_intptr_t idx = (ev_intptr_t) arg, widx = idx + 1;
  73         u_char ch;
  74 
  75         count += recv(fd, (char*)&ch, sizeof(ch), 0);
  76         if (writes) {
  77                 if (widx >= num_pipes)
  78                         widx -= num_pipes;
  79                 send(pipes[2 * widx + 1], "e", 1, 0);
  80                 writes--;
  81                 fired++;
  82         }
  83 }
  84 
  85 static struct timeval *
  86 run_once(void)
  87 {
  88         evutil_socket_t *cp, space;
  89         long i;
  90         static struct timeval ts, te;
  91 
  92         for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
  93                 if (event_initialized(&events[i]))
  94                         event_del(&events[i]);
  95                 event_set(&events[i], cp[0], EV_READ | EV_PERSIST, read_cb, (void *)(ev_intptr_t) i);
  96                 event_add(&events[i], NULL);
  97         }
  98 
  99         event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
 100 
 101         fired = 0;
 102         space = num_pipes / num_active;
 103         space = space * 2;
 104         for (i = 0; i < num_active; i++, fired++)
 105                 send(pipes[i * space + 1], "e", 1, 0);
 106 
 107         count = 0;
 108         writes = num_writes;
 109         { int xcount = 0;
 110         evutil_gettimeofday(&ts, NULL);
 111         do {
 112                 event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
 113                 xcount++;
 114         } while (count != fired);
 115         evutil_gettimeofday(&te, NULL);
 116 
 117         if (xcount != count) fprintf(stderr, "Xcount: %d, Rcount: %d\n", xcount, count);
 118         }
 119 
 120         evutil_timersub(&te, &ts, &te);
 121 
 122         return (&te);
 123 }
 124 
 125 int
 126 main(int argc, char **argv)
 127 {
 128 #ifndef WIN32
 129         struct rlimit rl;
 130 #endif
 131         int i, c;
 132         struct timeval *tv;
 133         evutil_socket_t *cp;
 134 
 135 #ifdef WIN32
 136         WSADATA WSAData;
 137         WSAStartup(0x101, &WSAData);
 138 #endif
 139         num_pipes = 100;
 140         num_active = 1;
 141         num_writes = num_pipes;
 142         while ((c = getopt(argc, argv, "n:a:w:")) != -1) {
 143                 switch (c) {
 144                 case 'n':
 145                         num_pipes = atoi(optarg);
 146                         break;
 147                 case 'a':
 148                         num_active = atoi(optarg);
 149                         break;
 150                 case 'w':
 151                         num_writes = atoi(optarg);
 152                         break;
 153                 default:
 154                         fprintf(stderr, "Illegal argument \"%c\"\n", c);
 155                         exit(1);
 156                 }
 157         }
 158 
 159 #ifndef WIN32
 160         rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50;
 161         if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
 162                 perror("setrlimit");
 163                 exit(1);
 164         }
 165 #endif
 166 
 167         events = calloc(num_pipes, sizeof(struct event));
 168         pipes = calloc(num_pipes * 2, sizeof(evutil_socket_t));
 169         if (events == NULL || pipes == NULL) {
 170                 perror("malloc");
 171                 exit(1);
 172         }
 173 
 174         event_init();
 175 
 176         for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
 177 #ifdef USE_PIPES
 178                 if (pipe(cp) == -1) {
 179 #else
 180                 if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
 181 #endif
 182                         perror("pipe");
 183                         exit(1);
 184                 }
 185         }
 186 
 187         for (i = 0; i < 25; i++) {
 188                 tv = run_once();
 189                 if (tv == NULL)
 190                         exit(1);
 191                 fprintf(stdout, "%ld\n",
 192                         tv->tv_sec * 1000000L + tv->tv_usec);
 193         }
 194 
 195         exit(0);
 196 }