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/*
* Copyright 2007-2012 Niels Provos and Nick Mathewson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include "event2/event-config.h"
#include <sys/types.h>
#include <sys/stat.h>
#ifdef _EVENT_HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#else
#include <sys/socket.h>
#include <sys/resource.h>
#endif
#include <signal.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#ifdef _EVENT_HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#include <event.h>
#include <evutil.h>
/*
* This benchmark tests how quickly we can propagate a write down a chain
* of socket pairs. We start by writing to the first socket pair and all
* events will fire subsequently until the last socket pair has been reached
* and the benchmark terminates.
*/
static int fired;
static int *pipes;
static struct event *events;
static void
read_cb(evutil_socket_t fd, short which, void *arg)
{
char ch;
long idx = (long) arg;
recv(fd, &ch, sizeof(ch), 0);
if (idx >= 0) {
if (send(idx, "e", 1, 0) < 0)
perror("send");
}
fired++;
}
static struct timeval *
run_once(int num_pipes)
{
int *cp, i;
static struct timeval ts, te, tv_timeout;
events = calloc(num_pipes, sizeof(struct event));
pipes = calloc(num_pipes * 2, sizeof(int));
if (events == NULL || pipes == NULL) {
perror("malloc");
exit(1);
}
for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
perror("socketpair");
exit(1);
}
}
/* measurements includes event setup */
evutil_gettimeofday(&ts, NULL);
/* provide a default timeout for events */
evutil_timerclear(&tv_timeout);
tv_timeout.tv_sec = 60;
for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
long fd = i < num_pipes - 1 ? cp[3] : -1;
event_set(&events[i], cp[0], EV_READ, read_cb, (void *) fd);
event_add(&events[i], &tv_timeout);
}
fired = 0;
/* kick everything off with a single write */
if (send(pipes[1], "e", 1, 0) < 0)
perror("send");
event_dispatch();
evutil_gettimeofday(&te, NULL);
evutil_timersub(&te, &ts, &te);
for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
event_del(&events[i]);
close(cp[0]);
close(cp[1]);
}
free(pipes);
free(events);
return (&te);
}
int
main(int argc, char **argv)
{
#ifndef WIN32
struct rlimit rl;
#endif
int i, c;
struct timeval *tv;
int num_pipes = 100;
while ((c = getopt(argc, argv, "n:")) != -1) {
switch (c) {
case 'n':
num_pipes = atoi(optarg);
break;
default:
fprintf(stderr, "Illegal argument \"%c\"\n", c);
exit(1);
}
}
#ifndef WIN32
rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50;
if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
perror("setrlimit");
exit(1);
}
#endif
event_init();
for (i = 0; i < 25; i++) {
tv = run_once(num_pipes);
if (tv == NULL)
exit(1);
fprintf(stdout, "%ld\n",
tv->tv_sec * 1000000L + tv->tv_usec);
}
exit(0);
}
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