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 #include <event.h>
61 #include <evutil.h>
62
63 static int count, writes, fired;
64 static int *pipes;
65 static int num_pipes, num_active, num_writes;
66 static struct event *events;
67
68
69 static void
read_cb(evutil_socket_t fd,short which,void * arg)70 read_cb(evutil_socket_t fd, short which, void *arg)
71 {
72 long idx = (long) arg, widx = idx + 1;
73 u_char ch;
74
75 count += recv(fd, (char*)&ch, sizeof(ch), 0);
76 if (writes) {
77 if (widx >= num_pipes)
78 widx -= num_pipes;
79 send(pipes[2 * widx + 1], "e", 1, 0);
80 writes--;
81 fired++;
82 }
83 }
84
85 static struct timeval *
run_once(void)86 run_once(void)
87 {
88 int *cp, space;
89 long i;
90 static struct timeval ts, te;
91
92 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
93 if (event_initialized(&events[i]))
94 event_del(&events[i]);
95 event_set(&events[i], cp[0], EV_READ | EV_PERSIST, read_cb, (void *) i);
96 event_add(&events[i], NULL);
97 }
98
99 event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
100
101 fired = 0;
102 space = num_pipes / num_active;
103 space = space * 2;
104 for (i = 0; i < num_active; i++, fired++)
105 send(pipes[i * space + 1], "e", 1, 0);
106
107 count = 0;
108 writes = num_writes;
109 { int xcount = 0;
110 evutil_gettimeofday(&ts, NULL);
111 do {
112 event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
113 xcount++;
114 } while (count != fired);
115 evutil_gettimeofday(&te, NULL);
116
117 if (xcount != count) fprintf(stderr, "Xcount: %d, Rcount: %d\n", xcount, count);
118 }
119
120 evutil_timersub(&te, &ts, &te);
121
122 return (&te);
123 }
124
125 int
main(int argc,char ** argv)126 main(int argc, char **argv)
127 {
128 #ifndef WIN32
129 struct rlimit rl;
130 #endif
131 int i, c;
132 struct timeval *tv;
133 int *cp;
134
135 #ifdef WIN32
136 WSADATA WSAData;
137 WSAStartup(0x101, &WSAData);
138 #endif
139 num_pipes = 100;
140 num_active = 1;
141 num_writes = num_pipes;
142 while ((c = getopt(argc, argv, "n:a:w:")) != -1) {
143 switch (c) {
144 case 'n':
145 num_pipes = atoi(optarg);
146 break;
147 case 'a':
148 num_active = atoi(optarg);
149 break;
150 case 'w':
151 num_writes = atoi(optarg);
152 break;
153 default:
154 fprintf(stderr, "Illegal argument \"%c\"\n", c);
155 exit(1);
156 }
157 }
158
159 #ifndef WIN32
160 rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50;
161 if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
162 perror("setrlimit");
163 exit(1);
164 }
165 #endif
166
167 events = calloc(num_pipes, sizeof(struct event));
168 pipes = calloc(num_pipes * 2, sizeof(int));
169 if (events == NULL || pipes == NULL) {
170 perror("malloc");
171 exit(1);
172 }
173
174 event_init();
175
176 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
177 #ifdef USE_PIPES
178 if (pipe(cp) == -1) {
179 #else
180 if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
181 #endif
182 perror("pipe");
183 exit(1);
184 }
185 }
186
187 for (i = 0; i < 25; i++) {
188 tv = run_once();
189 if (tv == NULL)
190 exit(1);
191 fprintf(stdout, "%ld\n",
192 tv->tv_sec * 1000000L + tv->tv_usec);
193 }
194
195 exit(0);
196 }
197