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
read_cb(evutil_socket_t fd,short which,void * arg)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 *
run_once(void)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
main(int argc,char ** argv)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