Attachment 4782 Details for Bug 11588 – pi condvar patch impact on normal path testcase

pi condvar patch impact on normal path testcase

condvar_perf.c (text/x-csrc), 3.57 KB, created by Darren Hart on 2010-05-11 18:55:41 UTC

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Creator: Darren Hart

Created: 2010-05-11 18:55:41 UTC

Size: 3.57 KB

patch

obsolete

>/******************************************************************************
> *
> *   Copyright Â© International Business Machines  Corp., 2010
> *
> *   This program is free software;  you can redistribute it and/or modify
> *   it under the terms of the GNU General Public License as published by
> *   the Free Software Foundation; either version 2 of the License, or
> *   (at your option) any later version.
> *
> *   This program is distributed in the hope that it will be useful,
> *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
> *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
> *   the GNU General Public License for more details.
> *
> *   You should have received a copy of the GNU General Public License
> *   along with this program;  if not, write to the Free Software
> *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> *
> * NAME
> *      condvar_perf.c
> *
> * DESCRIPTION
> *      This test is designed to test the efficiency of the pthread_cond_wait
> *      and pthread_cond_signal code paths within glibc.
> *
> * AUTHOR
> *      Darren Hart <dvhltc@us.ibm.com>
> *
> * HISTORY
> *      2010-Feb-23: Initial version by Darren Hart <dvhltc@us.ibm.com>
> *
> *****************************************************************************/
>
>#include <time.h>
>#include <unistd.h>
>#include <stdlib.h>
>#include <sched.h>
>#include <stdio.h>
>#include <pthread.h>
>#include <getopt.h>
>
>#define USEC_PER_SEC 1000000
>#define NSEC_PER_USEC 1000
>#define DEFAULT_ITERS 1000000
>
>static int sched_fifo_prio = 0;
>static int iterations;
>static int synch = 0;
>
>static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
>static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
>
>void usage(char *prog)
>{
>	printf("Usage: %s\n", prog);
>	printf("  -f #  Run as SCHED_FIFO prio # (default SCHED_OTHER)\n");
>	printf("  -h	Display this help message\n");
>	printf("  -i #	Number of iterations (default %d)\n", DEFAULT_ITERS);
>	printf("  -s 	Synchronous signaling (lock mutex)\n");
>}
>
>void * waiter(void *arg)
>{
>	while (iterations) {
>		pthread_mutex_lock(&mutex);
>		pthread_cond_wait(&cond, &mutex);
>		iterations--;
>		pthread_mutex_unlock(&mutex);
>	}
>	return NULL;
>}
>
>int main(int argc, char *argv[])
>{
>	struct timespec start_ts, end_ts;
>	int conf_iters = DEFAULT_ITERS;
>	long long delta_us;
>	pthread_t child_id;
>	int ret = 0;
>	int c;
>
>	while ((c = getopt(argc, argv, "f:hi:s")) != -1) {
>		switch(c) {
>		case 'f':
>			sched_fifo_prio = atoi(optarg);
>			break;
>		case 'h':
>			usage(argv[0]);
>			exit(0);
>		case 'i':
>			conf_iters = atoi(optarg);
>			break;
>		case 's':
>			synch = 1;
>			break;
>		default:
>			usage(argv[0]);
>			exit(1);
>		}
>	}
>	iterations = conf_iters;
>
>	if (sched_fifo_prio) {
>		struct sched_param sp;
>		sp.sched_priority = sched_fifo_prio;
>		if ((ret = sched_setscheduler(0, SCHED_FIFO, &sp))) {
>			perror("sched_setscheduler");
>			goto out;
>		}
>	}
>
>	if ((ret = pthread_create(&child_id, NULL, waiter, NULL))) {
>		perror("pthread_create failed");
>		goto out;
>	}
>
>	clock_gettime(CLOCK_REALTIME, &start_ts);
>
>	while (iterations) {
>		if (synch) pthread_mutex_lock(&mutex);
>		pthread_cond_signal(&cond);
>		if (synch) pthread_mutex_unlock(&mutex);
>	}
>
>	clock_gettime(CLOCK_REALTIME, &end_ts);
>	delta_us = (end_ts.tv_sec - start_ts.tv_sec) * USEC_PER_SEC;
>	delta_us += (end_ts.tv_nsec - start_ts.tv_nsec) / NSEC_PER_USEC;
>
>	printf("Scheduling: %s %d\n", sched_fifo_prio ? "SCHED_FIFO" : "SCHED_OTHER",
>				      sched_fifo_prio);
>	printf("Iterations: %d us\n", conf_iters);
>	printf("Runtime: %lld us\n", delta_us);
>	printf("Cycles/Second: %f\n", (float)conf_iters/((float)delta_us/USEC_PER_SEC));
>
> out:
>	return ret;
>}

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Attachments on bug 11588: 4779 | 4780 | 4781 | 4782 | 4785 | 4786 | 4787 | 4788 | 4789 | 4821 | 7238 | 7239 | 7240 | 7282 | 7442 | 7684 | 7685 | 7686 | 7687 | 7688 | 7689