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 #include "../util-internal.h"
38
39 #include <sys/types.h>
40 #include <sys/stat.h>
41 #ifdef EVENT__HAVE_SYS_TIME_H
42 #include <sys/time.h>
43 #endif
44 #ifdef _WIN32
45 #define WIN32_LEAN_AND_MEAN
46 #include <windows.h>
47 #else
48 #include <sys/socket.h>
49 #include <signal.h>
50 #include <sys/resource.h>
51 #endif
52 #include <fcntl.h>
53 #include <stdlib.h>
54 #include <stdio.h>
55 #include <string.h>
56 #ifdef EVENT__HAVE_UNISTD_H
57 #include <unistd.h>
58 #endif
59 #include <errno.h>
60
61 #ifdef _WIN32
62 #include <getopt.h>
63 #endif
64
65 #include <event.h>
66 #include <evutil.h>
67
68 static ev_ssize_t count, fired;
69 static int writes, failures;
70 static evutil_socket_t *pipes;
71 static int num_pipes, num_active, num_writes;
72 static struct event *events;
73
74
75 static void
read_cb(evutil_socket_t fd,short which,void * arg)76 read_cb(evutil_socket_t fd, short which, void *arg)
77 {
78 ev_intptr_t idx = (ev_intptr_t) arg, widx = idx + 1;
79 unsigned char ch;
80 ev_ssize_t n;
81
82 n = recv(fd, (char*)&ch, sizeof(ch), 0);
83 if (n >= 0)
84 count += n;
85 else
86 failures++;
87 if (writes) {
88 if (widx >= num_pipes)
89 widx -= num_pipes;
90 n = send(pipes[2 * widx + 1], "e", 1, 0);
91 if (n != 1)
92 failures++;
93 writes--;
94 fired++;
95 }
96 }
97
98 static struct timeval *
run_once(void)99 run_once(void)
100 {
101 evutil_socket_t *cp, space;
102 long i;
103 static struct timeval ts, te;
104
105 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
106 if (event_initialized(&events[i]))
107 event_del(&events[i]);
108 event_set(&events[i], cp[0], EV_READ | EV_PERSIST, read_cb, (void *)(ev_intptr_t) i);
109 event_add(&events[i], NULL);
110 }
111
112 event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
113
114 fired = 0;
115 space = num_pipes / num_active;
116 space = space * 2;
117 for (i = 0; i < num_active; i++, fired++)
118 (void) send(pipes[i * space + 1], "e", 1, 0);
119
120 count = 0;
121 writes = num_writes;
122 {
123 int xcount = 0;
124 evutil_gettimeofday(&ts, NULL);
125 do {
126 event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
127 xcount++;
128 } while (count != fired);
129 evutil_gettimeofday(&te, NULL);
130
131 if (xcount != count)
132 fprintf(stderr, "Xcount: %d, Rcount: " EV_SSIZE_FMT "\n",
133 xcount, count);
134 }
135
136 evutil_timersub(&te, &ts, &te);
137
138 return (&te);
139 }
140
141 int
main(int argc,char ** argv)142 main(int argc, char **argv)
143 {
144 #ifdef EVENT__HAVE_SETRLIMIT
145 struct rlimit rl;
146 #endif
147 int i, c;
148 struct timeval *tv;
149 evutil_socket_t *cp;
150
151 #ifdef _WIN32
152 WSADATA WSAData;
153 WSAStartup(0x101, &WSAData);
154 #endif
155 num_pipes = 100;
156 num_active = 1;
157 num_writes = num_pipes;
158 while ((c = getopt(argc, argv, "n:a:w:")) != -1) {
159 switch (c) {
160 case 'n':
161 num_pipes = atoi(optarg);
162 break;
163 case 'a':
164 num_active = atoi(optarg);
165 break;
166 case 'w':
167 num_writes = atoi(optarg);
168 break;
169 default:
170 fprintf(stderr, "Illegal argument \"%c\"\n", c);
171 exit(1);
172 }
173 }
174
175 #ifdef EVENT__HAVE_SETRLIMIT
176 rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50;
177 if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
178 perror("setrlimit");
179 exit(1);
180 }
181 #endif
182
183 events = calloc(num_pipes, sizeof(struct event));
184 pipes = calloc(num_pipes * 2, sizeof(evutil_socket_t));
185 if (events == NULL || pipes == NULL) {
186 perror("malloc");
187 exit(1);
188 }
189
190 event_init();
191
192 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
193 #ifdef USE_PIPES
194 if (pipe(cp) == -1) {
195 #else
196 if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
197 #endif
198 perror("pipe");
199 exit(1);
200 }
201 }
202
203 for (i = 0; i < 25; i++) {
204 tv = run_once();
205 if (tv == NULL)
206 exit(1);
207 fprintf(stdout, "%ld\n",
208 tv->tv_sec * 1000000L + tv->tv_usec);
209 }
210
211 exit(0);
212 }
213