1 /* 2 * Copyright 2003 Niels Provos <provos (at) 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 (at) 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 } 189
