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 63static int count, writes, fired; 64static int *pipes; 65static int num_pipes, num_active, num_writes; 66static struct event *events; 67 68 69static void 70read_cb(evutil_socket_t fd, short which, void *arg) 71{ 72 long idx = (long) 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 85static struct timeval * 86run_once(void) 87{ 88 int *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 *) 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 125int 126main(int argc, char **argv) 127{ 128#ifndef WIN32 129 struct rlimit rl; 130#endif 131 int i, c; 132 struct timeval *tv; 133 int *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(int)); 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} 197