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 static struct event_base *base;
74
75
76 static void
read_cb(evutil_socket_t fd,short which,void * arg)77 read_cb(evutil_socket_t fd, short which, void *arg)
78 {
79 ev_intptr_t idx = (ev_intptr_t) arg, widx = idx + 1;
80 unsigned char ch;
81 ev_ssize_t n;
82
83 n = recv(fd, (char*)&ch, sizeof(ch), 0);
84 if (n >= 0)
85 count += n;
86 else
87 failures++;
88 if (writes) {
89 if (widx >= num_pipes)
90 widx -= num_pipes;
91 n = send(pipes[2 * widx + 1], "e", 1, 0);
92 if (n != 1)
93 failures++;
94 writes--;
95 fired++;
96 }
97 }
98
99 static struct timeval *
run_once(void)100 run_once(void)
101 {
102 evutil_socket_t *cp, space;
103 long i;
104 static struct timeval ts, te;
105
106 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
107 if (event_initialized(&events[i]))
108 event_del(&events[i]);
109 event_assign(&events[i], base, cp[0], EV_READ | EV_PERSIST, read_cb, (void *)(ev_intptr_t) i);
110 event_add(&events[i], NULL);
111 }
112
113 event_base_loop(base, EVLOOP_ONCE | EVLOOP_NONBLOCK);
114
115 fired = 0;
116 space = num_pipes / num_active;
117 space = space * 2;
118 for (i = 0; i < num_active; i++, fired++)
119 (void) send(pipes[i * space + 1], "e", 1, 0);
120
121 count = 0;
122 writes = num_writes;
123 {
124 int xcount = 0;
125 evutil_gettimeofday(&ts, NULL);
126 do {
127 event_base_loop(base, EVLOOP_ONCE | EVLOOP_NONBLOCK);
128 xcount++;
129 } while (count != fired);
130 evutil_gettimeofday(&te, NULL);
131
132 if (xcount != count)
133 fprintf(stderr, "Xcount: %d, Rcount: " EV_SSIZE_FMT "\n",
134 xcount, count);
135 }
136
137 evutil_timersub(&te, &ts, &te);
138
139 return (&te);
140 }
141
142 int
main(int argc,char ** argv)143 main(int argc, char **argv)
144 {
145 #ifdef EVENT__HAVE_SETRLIMIT
146 struct rlimit rl;
147 #endif
148 int i, c;
149 struct timeval *tv;
150 evutil_socket_t *cp;
151 const char **methods;
152 const char *method = NULL;
153 struct event_config *cfg = NULL;
154
155 #ifdef _WIN32
156 WSADATA WSAData;
157 WSAStartup(0x101, &WSAData);
158 #endif
159 num_pipes = 100;
160 num_active = 1;
161 num_writes = num_pipes;
162 while ((c = getopt(argc, argv, "n:a:w:m:l")) != -1) {
163 switch (c) {
164 case 'n':
165 num_pipes = atoi(optarg);
166 break;
167 case 'a':
168 num_active = atoi(optarg);
169 break;
170 case 'w':
171 num_writes = atoi(optarg);
172 break;
173 case 'm':
174 method = optarg;
175 break;
176 case 'l':
177 methods = event_get_supported_methods();
178 fprintf(stdout, "Using Libevent %s. Available methods are:\n",
179 event_get_version());
180 for (i = 0; methods[i] != NULL; ++i)
181 printf(" %s\n", methods[i]);
182 exit(0);
183 default:
184 fprintf(stderr, "Illegal argument \"%c\"\n", c);
185 exit(1);
186 }
187 }
188
189 #ifdef EVENT__HAVE_SETRLIMIT
190 rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50;
191 if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
192 perror("setrlimit");
193 exit(1);
194 }
195 #endif
196
197 events = calloc(num_pipes, sizeof(struct event));
198 pipes = calloc(num_pipes * 2, sizeof(evutil_socket_t));
199 if (events == NULL || pipes == NULL) {
200 perror("malloc");
201 exit(1);
202 }
203
204 if (method != NULL) {
205 cfg = event_config_new();
206 methods = event_get_supported_methods();
207 for (i = 0; methods[i] != NULL; ++i)
208 if (strcmp(methods[i], method))
209 event_config_avoid_method(cfg, methods[i]);
210 base = event_base_new_with_config(cfg);
211 event_config_free(cfg);
212 } else
213 base = event_base_new();
214
215 for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
216 #ifdef USE_PIPES
217 if (pipe(cp) == -1) {
218 #else
219 if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
220 #endif
221 perror("pipe");
222 exit(1);
223 }
224 }
225
226 for (i = 0; i < 25; i++) {
227 tv = run_once();
228 if (tv == NULL)
229 exit(1);
230 fprintf(stdout, "%ld\n",
231 tv->tv_sec * 1000000L + tv->tv_usec);
232 }
233
234 exit(0);
235 }
236