bench_cascade.c (4694B)
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 #include <getopt.h> 39 #else /* _WIN32 */ 40 #include <sys/socket.h> 41 #include <sys/resource.h> 42 #endif 43 #include <signal.h> 44 #include <fcntl.h> 45 #include <stdlib.h> 46 #include <stdio.h> 47 #include <string.h> 48 #ifdef EVENT__HAVE_UNISTD_H 49 #include <unistd.h> 50 #endif 51 #include <errno.h> 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 62 static int fired; 63 static evutil_socket_t *pipes; 64 static struct event *events; 65 66 static void 67 read_cb(evutil_socket_t fd, short which, void *arg) 68 { 69 char ch; 70 evutil_socket_t sock = (evutil_socket_t)(ev_intptr_t)arg; 71 72 (void) recv(fd, &ch, sizeof(ch), 0); 73 if (sock >= 0) { 74 if (send(sock, "e", 1, 0) < 0) 75 perror("send"); 76 } 77 fired++; 78 } 79 80 static struct timeval * 81 run_once(int num_pipes) 82 { 83 int i; 84 evutil_socket_t *cp; 85 static struct timeval ts, te, tv_timeout; 86 87 events = (struct event *)calloc(num_pipes, sizeof(struct event)); 88 pipes = (evutil_socket_t *)calloc(num_pipes * 2, sizeof(evutil_socket_t)); 89 90 if (events == NULL || pipes == NULL) { 91 perror("malloc"); 92 exit(1); 93 } 94 95 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) { 96 if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) { 97 perror("socketpair"); 98 exit(1); 99 } 100 } 101 102 /* measurements includes event setup */ 103 evutil_gettimeofday(&ts, NULL); 104 105 /* provide a default timeout for events */ 106 evutil_timerclear(&tv_timeout); 107 tv_timeout.tv_sec = 60; 108 109 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) { 110 evutil_socket_t fd = i < num_pipes - 1 ? cp[3] : -1; 111 event_set(&events[i], cp[0], EV_READ, read_cb, 112 (void *)(ev_intptr_t)fd); 113 event_add(&events[i], &tv_timeout); 114 } 115 116 fired = 0; 117 118 /* kick everything off with a single write */ 119 if (send(pipes[1], "e", 1, 0) < 0) 120 perror("send"); 121 122 event_dispatch(); 123 124 evutil_gettimeofday(&te, NULL); 125 evutil_timersub(&te, &ts, &te); 126 127 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) { 128 event_del(&events[i]); 129 evutil_closesocket(cp[0]); 130 evutil_closesocket(cp[1]); 131 } 132 133 free(pipes); 134 free(events); 135 136 return (&te); 137 } 138 139 int 140 main(int argc, char **argv) 141 { 142 #ifdef EVENT__HAVE_SETRLIMIT 143 struct rlimit rl; 144 #endif 145 int i, c; 146 struct timeval *tv; 147 148 int num_pipes = 100; 149 #ifdef _WIN32 150 WSADATA WSAData; 151 WSAStartup(0x101, &WSAData); 152 #endif 153 154 while ((c = getopt(argc, argv, "n:")) != -1) { 155 switch (c) { 156 case 'n': 157 num_pipes = atoi(optarg); 158 break; 159 default: 160 fprintf(stderr, "Illegal argument \"%c\"\n", c); 161 exit(1); 162 } 163 } 164 165 #ifdef EVENT__HAVE_SETRLIMIT 166 rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50; 167 if (setrlimit(RLIMIT_NOFILE, &rl) == -1) { 168 perror("setrlimit"); 169 exit(1); 170 } 171 #endif 172 173 event_init(); 174 175 for (i = 0; i < 25; i++) { 176 tv = run_once(num_pipes); 177 if (tv == NULL) 178 exit(1); 179 fprintf(stdout, "%ld\n", 180 tv->tv_sec * 1000000L + tv->tv_usec); 181 } 182 183 #ifdef _WIN32 184 WSACleanup(); 185 #endif 186 187 exit(0); 188 }