/* * 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); }