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 #ifdef _WIN32 61 #include <getopt.h> 62 #endif 63 64 #include <event.h> 65 #include <evutil.h> 66 67 static int count, writes, fired, failures; 68 static evutil_socket_t *pipes; 69 static int num_pipes, num_active, num_writes; 70 static struct event *events; 71 72 73 static void 74 read_cb(evutil_socket_t fd, short which, void *arg) 75 { 76 ev_intptr_t idx = (ev_intptr_t) arg, widx = idx + 1; 77 unsigned char ch; 78 ev_ssize_t n; 79 80 n = recv(fd, (char*)&ch, sizeof(ch), 0); 81 if (n >= 0) 82 count += n; 83 else 84 failures++; 85 if (writes) { 86 if (widx >= num_pipes) 87 widx -= num_pipes; 88 n = send(pipes[2 * widx + 1], "e", 1, 0); 89 if (n != 1) 90 failures++; 91 writes--; 92 fired++; 93 } 94 } 95 96 static struct timeval * 97 run_once(void) 98 { 99 evutil_socket_t *cp, space; 100 long i; 101 static struct timeval ts, te; 102 103 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) { 104 if (event_initialized(&events[i])) 105 event_del(&events[i]); 106 event_set(&events[i], cp[0], EV_READ | EV_PERSIST, read_cb, (void *)(ev_intptr_t) i); 107 event_add(&events[i], NULL); 108 } 109 110 event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK); 111 112 fired = 0; 113 space = num_pipes / num_active; 114 space = space * 2; 115 for (i = 0; i < num_active; i++, fired++) 116 (void) send(pipes[i * space + 1], "e", 1, 0); 117 118 count = 0; 119 writes = num_writes; 120 { int xcount = 0; 121 evutil_gettimeofday(&ts, NULL); 122 do { 123 event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK); 124 xcount++; 125 } while (count != fired); 126 evutil_gettimeofday(&te, NULL); 127 128 if (xcount != count) fprintf(stderr, "Xcount: %d, Rcount: %d\n", xcount, count); 129 } 130 131 evutil_timersub(&te, &ts, &te); 132 133 return (&te); 134 } 135 136 int 137 main(int argc, char **argv) 138 { 139 #ifdef HAVE_SETRLIMIT 140 struct rlimit rl; 141 #endif 142 int i, c; 143 struct timeval *tv; 144 evutil_socket_t *cp; 145 146 #ifdef _WIN32 147 WSADATA WSAData; 148 WSAStartup(0x101, &WSAData); 149 #endif 150 num_pipes = 100; 151 num_active = 1; 152 num_writes = num_pipes; 153 while ((c = getopt(argc, argv, "n:a:w:")) != -1) { 154 switch (c) { 155 case 'n': 156 num_pipes = atoi(optarg); 157 break; 158 case 'a': 159 num_active = atoi(optarg); 160 break; 161 case 'w': 162 num_writes = atoi(optarg); 163 break; 164 default: 165 fprintf(stderr, "Illegal argument \"%c\"\n", c); 166 exit(1); 167 } 168 } 169 170 #ifdef HAVE_SETRLIMIT 171 rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50; 172 if (setrlimit(RLIMIT_NOFILE, &rl) == -1) { 173 perror("setrlimit"); 174 exit(1); 175 } 176 #endif 177 178 events = calloc(num_pipes, sizeof(struct event)); 179 pipes = calloc(num_pipes * 2, sizeof(evutil_socket_t)); 180 if (events == NULL || pipes == NULL) { 181 perror("malloc"); 182 exit(1); 183 } 184 185 event_init(); 186 187 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) { 188 #ifdef USE_PIPES 189 if (pipe(cp) == -1) { 190 #else 191 if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) { 192 #endif 193 perror("pipe"); 194 exit(1); 195 } 196 } 197 198 for (i = 0; i < 25; i++) { 199 tv = run_once(); 200 if (tv == NULL) 201 exit(1); 202 fprintf(stdout, "%ld\n", 203 tv->tv_sec * 1000000L + tv->tv_usec); 204 } 205 206 exit(0); 207 } 208