2 * Copyright 2007-2012 Niels Provos and Nick Mathewson
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 4. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include "event2/event-config.h"
30 #include <sys/types.h>
32 #ifdef _EVENT_HAVE_SYS_TIME_H
36 #define WIN32_LEAN_AND_MEAN
39 #include <sys/socket.h>
40 #include <sys/resource.h>
47 #ifdef _EVENT_HAVE_UNISTD_H
56 * This benchmark tests how quickly we can propagate a write down a chain
57 * of socket pairs. We start by writing to the first socket pair and all
58 * events will fire subsequently until the last socket pair has been reached
59 * and the benchmark terminates.
64 static struct event
*events
;
67 read_cb(evutil_socket_t fd
, short which
, void *arg
)
70 long idx
= (long) arg
;
72 recv(fd
, &ch
, sizeof(ch
), 0);
78 static struct timeval
*
79 run_once(int num_pipes
)
82 static struct timeval ts
, te
, tv_timeout
;
84 events
= calloc(num_pipes
, sizeof(struct event
));
85 pipes
= calloc(num_pipes
* 2, sizeof(int));
87 if (events
== NULL
|| pipes
== NULL
) {
92 for (cp
= pipes
, i
= 0; i
< num_pipes
; i
++, cp
+= 2) {
93 if (evutil_socketpair(AF_UNIX
, SOCK_STREAM
, 0, cp
) == -1) {
99 /* measurements includes event setup */
100 evutil_gettimeofday(&ts
, NULL
);
102 /* provide a default timeout for events */
103 evutil_timerclear(&tv_timeout
);
104 tv_timeout
.tv_sec
= 60;
106 for (cp
= pipes
, i
= 0; i
< num_pipes
; i
++, cp
+= 2) {
107 long fd
= i
< num_pipes
- 1 ? cp
[3] : -1;
108 event_set(&events
[i
], cp
[0], EV_READ
, read_cb
, (void *) fd
);
109 event_add(&events
[i
], &tv_timeout
);
114 /* kick everything off with a single write */
115 send(pipes
[1], "e", 1, 0);
119 evutil_gettimeofday(&te
, NULL
);
120 evutil_timersub(&te
, &ts
, &te
);
122 for (cp
= pipes
, i
= 0; i
< num_pipes
; i
++, cp
+= 2) {
123 event_del(&events
[i
]);
135 main(int argc
, char **argv
)
144 while ((c
= getopt(argc
, argv
, "n:")) != -1) {
147 num_pipes
= atoi(optarg
);
150 fprintf(stderr
, "Illegal argument \"%c\"\n", c
);
156 rl
.rlim_cur
= rl
.rlim_max
= num_pipes
* 2 + 50;
157 if (setrlimit(RLIMIT_NOFILE
, &rl
) == -1) {
165 for (i
= 0; i
< 25; i
++) {
166 tv
= run_once(num_pipes
);
169 fprintf(stdout
, "%ld\n",
170 tv
->tv_sec
* 1000000L + tv
->tv_usec
);