2018-09-24 16:32:10 +00:00
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/*
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* Copyright 2003-2007 Niels Provos <provos@citi.umich.edu>
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* Copyright 2007-2012 Niels Provos and Nick Mathewson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*
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* Mon 03/10/2003 - Modified by Davide Libenzi <davidel@xmailserver.org>
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*
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* Added chain event propagation to improve the sensitivity of
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* the measure respect to the event loop efficency.
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*
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*
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*/
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#include "event2/event-config.h"
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2023-11-14 23:02:42 +00:00
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#include "../util-internal.h"
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2018-09-24 16:32:10 +00:00
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#include <sys/types.h>
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#include <sys/stat.h>
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#ifdef EVENT__HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#ifdef _WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#else
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#include <sys/socket.h>
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#include <signal.h>
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#include <sys/resource.h>
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#endif
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#ifdef EVENT__HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <errno.h>
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#ifdef _WIN32
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#include <getopt.h>
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#endif
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#include <event.h>
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#include <evutil.h>
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2023-11-14 23:02:42 +00:00
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static ev_ssize_t count, fired;
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static int writes, failures;
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2018-09-24 16:32:10 +00:00
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static evutil_socket_t *pipes;
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static int num_pipes, num_active, num_writes;
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static struct event *events;
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2023-11-14 23:02:42 +00:00
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static struct event_base *base;
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2018-09-24 16:32:10 +00:00
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static void
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read_cb(evutil_socket_t fd, short which, void *arg)
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{
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ev_intptr_t idx = (ev_intptr_t) arg, widx = idx + 1;
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unsigned char ch;
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ev_ssize_t n;
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n = recv(fd, (char*)&ch, sizeof(ch), 0);
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if (n >= 0)
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count += n;
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else
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failures++;
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if (writes) {
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if (widx >= num_pipes)
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widx -= num_pipes;
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n = send(pipes[2 * widx + 1], "e", 1, 0);
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if (n != 1)
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failures++;
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writes--;
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fired++;
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}
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}
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static struct timeval *
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run_once(void)
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{
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evutil_socket_t *cp, space;
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long i;
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static struct timeval ts, te;
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for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
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if (event_initialized(&events[i]))
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event_del(&events[i]);
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2023-11-14 23:02:42 +00:00
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event_assign(&events[i], base, cp[0], EV_READ | EV_PERSIST, read_cb, (void *)(ev_intptr_t) i);
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2018-09-24 16:32:10 +00:00
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event_add(&events[i], NULL);
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}
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2023-11-14 23:02:42 +00:00
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event_base_loop(base, EVLOOP_ONCE | EVLOOP_NONBLOCK);
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2018-09-24 16:32:10 +00:00
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fired = 0;
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space = num_pipes / num_active;
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space = space * 2;
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for (i = 0; i < num_active; i++, fired++)
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(void) send(pipes[i * space + 1], "e", 1, 0);
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count = 0;
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writes = num_writes;
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2023-11-14 23:02:42 +00:00
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{
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int xcount = 0;
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evutil_gettimeofday(&ts, NULL);
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do {
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event_base_loop(base, EVLOOP_ONCE | EVLOOP_NONBLOCK);
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xcount++;
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} while (count != fired);
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evutil_gettimeofday(&te, NULL);
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if (xcount != count)
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fprintf(stderr, "Xcount: %d, Rcount: " EV_SSIZE_FMT "\n",
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xcount, count);
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2018-09-24 16:32:10 +00:00
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}
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evutil_timersub(&te, &ts, &te);
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return (&te);
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}
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int
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main(int argc, char **argv)
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{
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2023-11-14 23:02:42 +00:00
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#ifdef EVENT__HAVE_SETRLIMIT
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2018-09-24 16:32:10 +00:00
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struct rlimit rl;
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#endif
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int i, c;
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struct timeval *tv;
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evutil_socket_t *cp;
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2023-11-14 23:02:42 +00:00
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const char **methods;
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const char *method = NULL;
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struct event_config *cfg = NULL;
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2018-09-24 16:32:10 +00:00
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#ifdef _WIN32
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WSADATA WSAData;
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WSAStartup(0x101, &WSAData);
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#endif
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num_pipes = 100;
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num_active = 1;
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num_writes = num_pipes;
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2023-11-14 23:02:42 +00:00
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while ((c = getopt(argc, argv, "n:a:w:m:l")) != -1) {
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2018-09-24 16:32:10 +00:00
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switch (c) {
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case 'n':
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num_pipes = atoi(optarg);
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break;
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case 'a':
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num_active = atoi(optarg);
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break;
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case 'w':
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num_writes = atoi(optarg);
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break;
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2023-11-14 23:02:42 +00:00
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case 'm':
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method = optarg;
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break;
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case 'l':
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methods = event_get_supported_methods();
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fprintf(stdout, "Using Libevent %s. Available methods are:\n",
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event_get_version());
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for (i = 0; methods[i] != NULL; ++i)
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printf(" %s\n", methods[i]);
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exit(0);
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2018-09-24 16:32:10 +00:00
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default:
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fprintf(stderr, "Illegal argument \"%c\"\n", c);
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exit(1);
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}
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}
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2023-11-14 23:02:42 +00:00
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#ifdef EVENT__HAVE_SETRLIMIT
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2018-09-24 16:32:10 +00:00
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rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50;
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if (setrlimit(RLIMIT_NOFILE, &rl) == -1) {
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perror("setrlimit");
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exit(1);
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}
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#endif
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events = calloc(num_pipes, sizeof(struct event));
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pipes = calloc(num_pipes * 2, sizeof(evutil_socket_t));
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if (events == NULL || pipes == NULL) {
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perror("malloc");
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exit(1);
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}
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2023-11-14 23:02:42 +00:00
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if (method != NULL) {
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cfg = event_config_new();
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methods = event_get_supported_methods();
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for (i = 0; methods[i] != NULL; ++i)
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if (strcmp(methods[i], method))
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event_config_avoid_method(cfg, methods[i]);
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base = event_base_new_with_config(cfg);
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event_config_free(cfg);
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} else
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base = event_base_new();
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2018-09-24 16:32:10 +00:00
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for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) {
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#ifdef USE_PIPES
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if (pipe(cp) == -1) {
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#else
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if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) {
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#endif
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perror("pipe");
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exit(1);
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}
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}
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for (i = 0; i < 25; i++) {
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tv = run_once();
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if (tv == NULL)
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exit(1);
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fprintf(stdout, "%ld\n",
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tv->tv_sec * 1000000L + tv->tv_usec);
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}
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exit(0);
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}
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