1/* 2 * Copyright 2007-2012 Niels Provos and Nick Mathewson 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 4. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 */ 27 28#include "event2/event-config.h" 29 30#include <sys/types.h> 31#include <sys/stat.h> 32#ifdef _EVENT_HAVE_SYS_TIME_H 33#include <sys/time.h> 34#endif 35#ifdef WIN32 36#define WIN32_LEAN_AND_MEAN 37#include <windows.h> 38#else 39#include <sys/socket.h> 40#include <sys/resource.h> 41#endif 42#include <signal.h> 43#include <fcntl.h> 44#include <stdlib.h> 45#include <stdio.h> 46#include <string.h> 47#ifdef _EVENT_HAVE_UNISTD_H 48#include <unistd.h> 49#endif 50#include <errno.h> 51 52#include <event.h> 53#include <evutil.h> 54 55/* 56 * This benchmark tests how quickly we can propagate a write down a chain 57 * of socket pairs. We start by writing to the first socket pair and all 58 * events will fire subsequently until the last socket pair has been reached 59 * and the benchmark terminates. 60 */ 61 62static int fired; 63static int *pipes; 64static struct event *events; 65 66static void 67read_cb(evutil_socket_t fd, short which, void *arg) 68{ 69 char ch; 70 long idx = (long) arg; 71 72 recv(fd, &ch, sizeof(ch), 0); 73 if (idx >= 0) 74 send(idx, "e", 1, 0); 75 fired++; 76} 77 78static struct timeval * 79run_once(int num_pipes) 80{ 81 int *cp, i; 82 static struct timeval ts, te, tv_timeout; 83 84 events = calloc(num_pipes, sizeof(struct event)); 85 pipes = calloc(num_pipes * 2, sizeof(int)); 86 87 if (events == NULL || pipes == NULL) { 88 perror("malloc"); 89 exit(1); 90 } 91 92 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) { 93 if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) { 94 perror("socketpair"); 95 exit(1); 96 } 97 } 98 99 /* measurements includes event setup */ 100 evutil_gettimeofday(&ts, NULL); 101 102 /* provide a default timeout for events */ 103 evutil_timerclear(&tv_timeout); 104 tv_timeout.tv_sec = 60; 105 106 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) { 107 long fd = i < num_pipes - 1 ? cp[3] : -1; 108 event_set(&events[i], cp[0], EV_READ, read_cb, (void *) fd); 109 event_add(&events[i], &tv_timeout); 110 } 111 112 fired = 0; 113 114 /* kick everything off with a single write */ 115 send(pipes[1], "e", 1, 0); 116 117 event_dispatch(); 118 119 evutil_gettimeofday(&te, NULL); 120 evutil_timersub(&te, &ts, &te); 121 122 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) { 123 event_del(&events[i]); 124 close(cp[0]); 125 close(cp[1]); 126 } 127 128 free(pipes); 129 free(events); 130 131 return (&te); 132} 133 134int 135main(int argc, char **argv) 136{ 137#ifndef WIN32 138 struct rlimit rl; 139#endif 140 int i, c; 141 struct timeval *tv; 142 143 int num_pipes = 100; 144 while ((c = getopt(argc, argv, "n:")) != -1) { 145 switch (c) { 146 case 'n': 147 num_pipes = atoi(optarg); 148 break; 149 default: 150 fprintf(stderr, "Illegal argument \"%c\"\n", c); 151 exit(1); 152 } 153 } 154 155#ifndef WIN32 156 rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50; 157 if (setrlimit(RLIMIT_NOFILE, &rl) == -1) { 158 perror("setrlimit"); 159 exit(1); 160 } 161#endif 162 163 event_init(); 164 165 for (i = 0; i < 25; i++) { 166 tv = run_once(num_pipes); 167 if (tv == NULL) 168 exit(1); 169 fprintf(stdout, "%ld\n", 170 tv->tv_sec * 1000000L + tv->tv_usec); 171 } 172 173 exit(0); 174} 175