bench.c

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Author : Nick Mathewson
Date : 2007-11-07 06:01:57
Hash : f74e7258
Message : r16501@catbus: nickm | 2007-11-07 01:00:31 -0500 This is one of those patches which will either make matters far simpler after the bugs shake out, or will get reverted pretty quick once we realize that it is a stupid idea. We now post-process the config.h file into a new event-config.h file, whose macros are prefixed with _EVENT_ and which is thus safe for headers to include. Using this, we can define replacement timeval manipulation functions in evutil.h, and use them uniformly through our code. We can also detect which headers are needful in event.h, and include them as required. This is also the perfect time to remove the long-deprecated acconfig.h file, so that autoheader no longer warns. Should resolve the following issues: [ 1826530 ] Header files should have access to autoconf output. [ 1826545 ] acconfig.h is deprecated. [ 1826564 ] On some platforms, event.h can't be included alone. svn:r492

test/bench.c

/*
 * Copyright 2003 Niels Provos <provos@citi.umich.edu>
 * All rights reserved.
 *
 * 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.
 *
 *
 * Mon 03/10/2003 - Modified by Davide Libenzi <davidel@xmailserver.org>
 *
 *     Added chain event propagation to improve the sensitivity of
 *     the measure respect to the event loop efficency.
 *
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#ifdef WIN32
#include <windows.h>
#else
#include <sys/socket.h>
#include <sys/signal.h>
#include <sys/resource.h>
#endif
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include <event.h>
#include <evutil.h>


static int count, writes, fired;
static int *pipes;
static int num_pipes, num_active, num_writes;
static struct event *events;



void
read_cb(int fd, short which, void *arg)
{
	int idx = (int) arg, widx = idx + 1;
	u_char ch;

	count += read(fd, &ch, sizeof(ch));
	if (writes) {
		if (widx >= num_pipes)
			widx -= num_pipes;
		write(pipes[2 * widx + 1], "e", 1);
		writes--;
		fired++;
	}
}

struct timeval *
run_once(void)
{
	int *cp, i, space;
	static struct timeval ts, te;

	for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
		event_del(&events[i]);
		event_set(&events[i], cp[0], EV_READ | EV_PERSIST, read_cb, (void *) i);
		event_add(&events[i], NULL);
	}

	event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);

	fired = 0;
	space = num_pipes / num_active;
	space = space * 2;
	for (i = 0; i < num_active; i++, fired++)
		write(pipes[i * space + 1], "e", 1);

	count = 0;
	writes = num_writes;
	{ int xcount = 0;
	gettimeofday(&ts, NULL);
	do {
		event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK);
		xcount++;
	} while (count != fired);
	gettimeofday(&te, NULL);

	if (xcount != count) fprintf(stderr, "Xcount: %d, Rcount: %d\n", xcount, count);
	}

	evutil_timersub(&te, &ts, &te);

	return (&te);
}

int
main (int argc, char **argv)
{
#ifndef WIN32
	struct rlimit rl;
#endif
	int i, c;
	struct timeval *tv;
	int *cp;
	extern char *optarg;

	num_pipes = 100;
	num_active = 1;
	num_writes = num_pipes;
	while ((c = getopt(argc, argv, "n:a:w:")) != -1) {
		switch (c) {
		case 'n':
			num_pipes = atoi(optarg);
			break;
		case 'a':
			num_active = atoi(optarg);
			break;
		case 'w':
			num_writes = 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

	events = calloc(num_pipes, sizeof(struct event));
	pipes = calloc(num_pipes * 2, sizeof(int));
	if (events == NULL || pipes == NULL) {
		perror("malloc");
		exit(1);
	}

	event_init();

	for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
#ifdef USE_PIPES
		if (pipe(cp) == -1) {
#else
		if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
#endif
			perror("pipe");
			exit(1);
		}
	}

	for (i = 0; i < 25; i++) {
		tv = run_once();
		if (tv == NULL)
			exit(1);
		fprintf(stdout, "%ld\n",
			tv->tv_sec * 1000000L + tv->tv_usec);
	}

	exit(0);
}

kc3-lang/libevent/test/bench.c

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kc3-lang/libevent /test/bench.c