1 /*
2 * Copyright 2003 Niels Provos <[email protected]>
3 * All rights reserved.
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 <[email protected]>
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 #ifdef HAVE_CONFIG_H
37 #include "config.h"
38 #endif
39
40 #include <sys/types.h>
41 #include <sys/stat.h>
42 #include <sys/time.h>
43 #ifdef WIN32
44 #include <windows.h>
45 #else
46 #include <sys/socket.h>
47 #include <signal.h>
48 #include <sys/resource.h>
49 #endif
50 #include <fcntl.h>
51 #include <stdlib.h>
52 #include <stdio.h>
53 #include <string.h>
54 #include <unistd.h>
55 #include <errno.h>
56
57 #include <event.h>
58 #include <evutil.h>
59
60
61 static int count, writes, fired;
62 static int *pipes;
63 static int num_pipes, num_active, num_writes;
64 static struct event *events;
65
66 static void
read_cb(int fd,short which,void * arg)67 read_cb(int fd, short which, void *arg)
68 {
69 long idx = (long) arg, widx = idx + 1;
70 u_char ch;
71
72 count += read(fd, &ch, sizeof(ch));
73 if (writes) {
74 if (widx >= num_pipes)
75 widx -= num_pipes;
76 write(pipes[2 * widx + 1], "e", 1);
77 writes--;
78 fired++;
79 }
80 }
81
82 static struct timeval *
run_once(void)83 run_once(void)
84 {
85 int *cp, space;
86 long i;
87 static struct timeval ts, te;
88
89 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
90 event_del(&events[i]);
91 event_set(&events[i], cp[0], EV_READ | EV_PERSIST, read_cb, (void *) i);
92 event_add(&events[i], NULL);
93 }
94
95 event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
96
97 fired = 0;
98 space = num_pipes / num_active;
99 space = space * 2;
100 for (i = 0; i < num_active; i++, fired++)
101 write(pipes[i * space + 1], "e", 1);
102
103 count = 0;
104 writes = num_writes;
105 { int xcount = 0;
106 gettimeofday(&ts, NULL);
107 do {
108 event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
109 xcount++;
110 } while (count != fired);
111 gettimeofday(&te, NULL);
112
113 if (xcount != count) fprintf(stderr, "Xcount: %d, Rcount: %d\n", xcount, count);
114 }
115
116 evutil_timersub(&te, &ts, &te);
117
118 return (&te);
119 }
120
121 int
main(int argc,char ** argv)122 main (int argc, char **argv)
123 {
124 #ifndef WIN32
125 struct rlimit rl;
126 #endif
127 int i, c;
128 struct timeval *tv;
129 int *cp;
130
131 num_pipes = 100;
132 num_active = 1;
133 num_writes = num_pipes;
134 while ((c = getopt(argc, argv, "n:a:w:")) != -1) {
135 switch (c) {
136 case 'n':
137 num_pipes = atoi(optarg);
138 break;
139 case 'a':
140 num_active = atoi(optarg);
141 break;
142 case 'w':
143 num_writes = atoi(optarg);
144 break;
145 default:
146 fprintf(stderr, "Illegal argument \"%c\"\n", c);
147 exit(1);
148 }
149 }
150
151 #ifndef WIN32
152 rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50;
153 if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
154 perror("setrlimit");
155 exit(1);
156 }
157 #endif
158
159 events = calloc(num_pipes, sizeof(struct event));
160 pipes = calloc(num_pipes * 2, sizeof(int));
161 if (events == NULL || pipes == NULL) {
162 perror("malloc");
163 exit(1);
164 }
165
166 event_init();
167
168 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
169 #ifdef USE_PIPES
170 if (pipe(cp) == -1) {
171 #else
172 if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
173 #endif
174 perror("pipe");
175 exit(1);
176 }
177 }
178
179 for (i = 0; i < 25; i++) {
180 tv = run_once();
181 if (tv == NULL)
182 exit(1);
183 fprintf(stdout, "%ld\n",
184 tv->tv_sec * 1000000L + tv->tv_usec);
185 }
186
187 exit(0);
188 }
189