From f7e93f9d431f16909d899b9fe972774af8ed352b Mon Sep 17 00:00:00 2001 From: Joachim Nilsson Date: Thu, 25 Jul 2013 14:06:11 +0200 Subject: [PATCH] Import Niels Provos bench.c, this version from http://libev.schmorp.de/bench.c Signed-off-by: Joachim Nilsson --- bench.c | 271 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 271 insertions(+) create mode 100644 bench.c diff --git a/bench.c b/bench.c new file mode 100644 index 0000000..d228795 --- /dev/null +++ b/bench.c @@ -0,0 +1,271 @@ +/* + * Copyright 2003 Niels Provos + * 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 + * + * Added chain event propagation to improve the sensitivity of + * the measure respect to the event loop efficency. + * + * + */ + +#define timersub(tvp, uvp, vvp) \ + do { \ + (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \ + (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \ + if ((vvp)->tv_usec < 0) { \ + (vvp)->tv_sec--; \ + (vvp)->tv_usec += 1000000; \ + } \ + } while (0) +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#if NATIVE +# include "ev.h" +#endif +#include + + +static int count, writes, fired; +static int *pipes; +static int num_pipes, num_active, num_writes; +static struct event *events; +static int timers, native; +static struct ev_io *evio; +static struct ev_timer *evto; + + + +void +read_cb(int fd, short which, void *arg) +{ + int idx = (int) arg, widx = idx + 1; + u_char ch; + + if (timers) + { + if (native) + { +#if NATIVE + evto [idx].repeat = 10. + drand48 (); + ev_timer_again (&evto [idx]); +#else + abort (); +#endif + } + else + { + struct timeval tv; + event_del (&events [idx]); + tv.tv_sec = 10; + tv.tv_usec = drand48() * 1e6; + event_add(&events[idx], &tv); + } + } + + count += read(fd, &ch, sizeof(ch)); + if (writes) { + if (widx >= num_pipes) + widx -= num_pipes; + write(pipes[2 * widx + 1], "e", 1); + writes--; + fired++; + } +} + +#if NATIVE +void +read_thunk(struct ev_io *w, int revents) +{ + read_cb (w->fd, revents, w->data); +} + +void +timer_cb (struct ev_timer *w, int revents) +{ + /* nop */ +} +#endif + +struct timeval * +run_once(void) +{ + int *cp, i, space; + static struct timeval ta, ts, te, tv; + + gettimeofday(&ta, NULL); + for (cp = pipes, i = 0; i < num_pipes; i++, cp += 2) { + if (native) + { +#if NATIVE + if (ev_is_active (&evio [i])) + ev_io_stop (&evio [i]); + + ev_io_set (&evio [i], cp [0], EV_READ); + ev_io_start (&evio [i]); + + evto [i].repeat = 10. + drand48 (); + ev_timer_again (&evto [i]); +#else + abort (); +#endif + } + else + { + event_del(&events[i]); + event_set(&events[i], cp[0], EV_READ | EV_PERSIST, read_cb, (void *) i); + tv.tv_sec = 10.; + tv.tv_usec = drand48() * 1e6; + event_add(&events[i], timers ? &tv : 0); + } + } + + 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); + } + + timersub(&te, &ta, &ta); + timersub(&te, &ts, &ts); + fprintf(stdout, "%8ld %8ld\n", + ta.tv_sec * 1000000L + ta.tv_usec, + ts.tv_sec * 1000000L + ts.tv_usec + ); + + 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:te")) != -1) { + switch (c) { + case 'n': + num_pipes = atoi(optarg); + break; + case 'a': + num_active = atoi(optarg); + break; + case 'w': + num_writes = atoi(optarg); + break; + case 'e': + native = 1; + break; + case 't': + timers = 1; + break; + default: + fprintf(stderr, "Illegal argument \"%c\"\n", c); + exit(1); + } + } + +#if 1 + rl.rlim_cur = rl.rlim_max = num_pipes * 2 + 50; + if (setrlimit(RLIMIT_NOFILE, &rl) == -1) { + perror("setrlimit"); + } +#endif + +#if NATIVE + evio = calloc(num_pipes, sizeof(struct ev_io)); + evto = calloc(num_pipes, sizeof(struct ev_timer)); +#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) { +#if NATIVE + if (native) { + ev_init (&evto [i], timer_cb); + ev_init (&evio [i], read_thunk); + evio [i].data = (void *)i; + } +#endif +#ifdef USE_PIPES + if (pipe(cp) == -1) { +#else + if (socketpair(AF_UNIX, SOCK_STREAM, 0, cp) == -1) { +#endif + perror("pipe"); + exit(1); + } + } + + for (i = 0; i < 2; i++) { + tv = run_once(); + } + + exit(0); +}