Messages in this thread | | | Date | Tue, 11 Mar 2003 10:15:10 -0800 (PST) | From | Davide Libenzi <> | Subject | Re: [patch, rfc] lt-epoll ( level triggered epoll ) ... |
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On Mon, 10 Mar 2003, Niels Provos wrote:
> On Mon, Mar 10, 2003 at 12:15:25PM -0800, Davide Libenzi wrote: > > The LT epoll is by all means the fastest poll available and can be used > > wherever poll can be used. To test it I also ported thttpd to LT > > epoll and, so far, it didn't puke on my face. Niels and Marius also wrote > > a nice event library : > [...] > > that uses LT epoll, as long as poll and select. The usage pattern of an LT > I compared the performance of LT epoll using libevent against other > event mechanisms: select, poll and kqueue. > > You can find the results at > > http://www.monkey.org/~provos/libevent/
Niels, can you publish inside the libevent web site the library that has epoll inside ( possibly with the changes I made to epoll_create() ) ? I'm including the test application, so other can repeat tests if they want.
- Davide
/* * Copyright 2003 Niels Provos <provos@citi.umich.edu> * All rights reserved. * * * 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. * * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Niels Provos. * 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. */
#ifdef HAVE_CONFIG_H #include "config.h" #endif
#include <sys/types.h> #include <sys/stat.h> #include <sys/time.h> #include <sys/socket.h> #include <sys/signal.h> #include <sys/resource.h> #include <fcntl.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <unistd.h> #include <errno.h>
#include <event.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; struct event *ev = &events[idx]; 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;
gettimeofday(&ts, NULL); do { event_loop(EVLOOP_ONCE | EVLOOP_NONBLOCK); } while (count != fired); gettimeofday(&te, NULL);
timersub(&te, &ts, &te);
return (&te); }
int main (int argc, char **argv) { struct rlimit rl; 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); } }
rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50; if (setrlimit(RLIMIT_NOFILE, &rl) == -1) { perror("setrlimit"); exit(1); }
events = calloc(num_pipes, sizeof(struct event)); pipes = calloc(num_pipes * 2, sizeof(int)); if (events == NULL || pipes == NULL) { perror("malloc"); exit(1); }
memset(events, 0, num_pipes * sizeof(struct event));
event_init();
for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) { if (pipe(cp) == -1) { 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); }
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