[userspace-rcu.git] / tests / test_looplen.c

/*
 * test_looplen.c
 *
 * Userspace RCU library - test program
 *
 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#define _GNU_SOURCE
#include <stdio.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdio.h>
#include <assert.h>
#include <sched.h>
#include <errno.h>

#include <urcu/arch.h>

#ifndef DYNAMIC_LINK_TEST
#define _LGPL_SOURCE
#else
#define debug_yield_read()
#endif
#include <urcu.h>

static inline void loop_sleep(unsigned long loops)
{
	while (loops-- != 0)
		caa_cpu_relax();
}

#define LOOPS 1048576
#define TESTS 10

int main(int argc, char **argv)
{
	unsigned long i;
	cycles_t time1, time2;
	cycles_t time_tot = 0;
	double cpl;

	for (i = 0; i < TESTS; i++) {
		time1 = caa_get_cycles();
		loop_sleep(LOOPS);
		time2 = caa_get_cycles();
		time_tot += time2 - time1;
	}
	cpl = ((double)time_tot) / (double)TESTS / (double)LOOPS;

	printf("CALIBRATION : %g cycles per loop\n", cpl);
	printf("time_tot = %llu, LOOPS = %d, TESTS = %d\n",
	       time_tot, LOOPS, TESTS);

	return 0;
}
Commit	Line	Data
	1	/*
	2	* test_looplen.c
	3	*
	4	* Userspace RCU library - test program
	5	*
	6	* Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License along
	19	* with this program; if not, write to the Free Software Foundation, Inc.,
	20	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	21	*/
	22
	23	#define _GNU_SOURCE
	24	#include <stdio.h>
	25	#include <pthread.h>
	26	#include <stdlib.h>
	27	#include <string.h>
	28	#include <sys/types.h>
	29	#include <sys/wait.h>
	30	#include <unistd.h>
	31	#include <stdio.h>
	32	#include <assert.h>
	33	#include <sched.h>
	34	#include <errno.h>
	35
	36	#include <urcu/arch.h>
	37
	38	#ifndef DYNAMIC_LINK_TEST
	39	#define _LGPL_SOURCE
	40	#else
	41	#define debug_yield_read()
	42	#endif
	43	#include <urcu.h>
	44
	45	static inline void loop_sleep(unsigned long loops)
	46	{
	47	while (loops-- != 0)
	48	caa_cpu_relax();
	49	}
	50
	51	#define LOOPS 1048576
	52	#define TESTS 10
	53
	54	int main(int argc, char **argv)
	55	{
	56	unsigned long i;
	57	cycles_t time1, time2;
	58	cycles_t time_tot = 0;
	59	double cpl;
	60
	61	for (i = 0; i < TESTS; i++) {
	62	time1 = caa_get_cycles();
	63	loop_sleep(LOOPS);
	64	time2 = caa_get_cycles();
	65	time_tot += time2 - time1;
	66	}
	67	cpl = ((double)time_tot) / (double)TESTS / (double)LOOPS;
	68
	69	printf("CALIBRATION : %g cycles per loop\n", cpl);
	70	printf("time_tot = %llu, LOOPS = %d, TESTS = %d\n",
	71	time_tot, LOOPS, TESTS);
	72
	73	return 0;
	74	}