1 /* $NetBSD: bench_cascade.c,v 1.5 2020/05/25 20:47:34 christos Exp $ */
2
3 /*
4 * Copyright 2007-2012 Niels Provos and Nick Mathewson
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 4. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 */
29
30 #include "event2/event-config.h"
31
32 #include <sys/types.h>
33 #include <sys/stat.h>
34 #ifdef EVENT__HAVE_SYS_TIME_H
35 #include <sys/time.h>
36 #endif
37 #ifdef _WIN32
38 #define WIN32_LEAN_AND_MEAN
39 #include <windows.h>
40 #else
41 #include <sys/socket.h>
42 #include <sys/resource.h>
43 #endif
44 #include <signal.h>
45 #include <fcntl.h>
46 #include <stdlib.h>
47 #include <stdio.h>
48 #include <string.h>
49 #ifdef EVENT__HAVE_UNISTD_H
50 #include <unistd.h>
51 #endif
52 #include <errno.h>
53 #include <getopt.h>
54 #include <event.h>
55 #include <evutil.h>
56
57 /*
58 * This benchmark tests how quickly we can propagate a write down a chain
59 * of socket pairs. We start by writing to the first socket pair and all
60 * events will fire subsequently until the last socket pair has been reached
61 * and the benchmark terminates.
62 */
63
64 static int fired;
65 static evutil_socket_t *pipes;
66 static struct event *events;
67
68 static void
read_cb(evutil_socket_t fd,short which,void * arg)69 read_cb(evutil_socket_t fd, short which, void *arg)
70 {
71 char ch;
72 evutil_socket_t sock = (evutil_socket_t)(ev_intptr_t)arg;
73
74 (void) recv(fd, &ch, sizeof(ch), 0);
75 if (sock >= 0) {
76 if (send(sock, "e", 1, 0) < 0)
77 perror("send");
78 }
79 fired++;
80 }
81
82 static struct timeval *
run_once(int num_pipes)83 run_once(int num_pipes)
84 {
85 int i;
86 evutil_socket_t *cp;
87 static struct timeval ts, te, tv_timeout;
88
89 events = (struct event *)calloc(num_pipes, sizeof(struct event));
90 pipes = (evutil_socket_t *)calloc(num_pipes * 2, sizeof(evutil_socket_t));
91
92 if (events == NULL || pipes == NULL) {
93 perror("malloc");
94 exit(1);
95 }
96
97 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
98 if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
99 perror("socketpair");
100 exit(1);
101 }
102 }
103
104 /* measurements includes event setup */
105 evutil_gettimeofday(&ts, NULL);
106
107 /* provide a default timeout for events */
108 evutil_timerclear(&tv_timeout);
109 tv_timeout.tv_sec = 60;
110
111 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
112 evutil_socket_t fd = i < num_pipes - 1 ? cp[3] : -1;
113 event_set(&events[i], cp[0], EV_READ, read_cb,
114 (void *)(ev_intptr_t)fd);
115 event_add(&events[i], &tv_timeout);
116 }
117
118 fired = 0;
119
120 /* kick everything off with a single write */
121 if (send(pipes[1], "e", 1, 0) < 0)
122 perror("send");
123
124 event_dispatch();
125
126 evutil_gettimeofday(&te, NULL);
127 evutil_timersub(&te, &ts, &te);
128
129 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
130 event_del(&events[i]);
131 evutil_closesocket(cp[0]);
132 evutil_closesocket(cp[1]);
133 }
134
135 free(pipes);
136 free(events);
137
138 return (&te);
139 }
140
141 int
main(int argc,char ** argv)142 main(int argc, char **argv)
143 {
144 #ifdef HAVE_SETRLIMIT
145 struct rlimit rl;
146 #endif
147 int i, c;
148 struct timeval *tv;
149
150 int num_pipes = 100;
151 #ifdef _WIN32
152 WSADATA WSAData;
153 WSAStartup(0x101, &WSAData);
154 #endif
155
156 while ((c = getopt(argc, argv, "n:")) != -1) {
157 switch (c) {
158 case 'n':
159 num_pipes = atoi(optarg);
160 break;
161 default:
162 fprintf(stderr, "Illegal argument \"%c\"\n", c);
163 exit(1);
164 }
165 }
166
167 #ifdef HAVE_SETRLIMIT
168 rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50;
169 if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
170 perror("setrlimit");
171 exit(1);
172 }
173 #endif
174
175 event_init();
176
177 for (i = 0; i < 25; i++) {
178 tv = run_once(num_pipes);
179 if (tv == NULL)
180 exit(1);
181 fprintf(stdout, "%ld\n",
182 tv->tv_sec * 1000000L + tv->tv_usec);
183 }
184
185 #ifdef _WIN32
186 WSACleanup();
187 #endif
188
189 exit(0);
190 }
191