[urcu.git] / tests / benchmark / test_rwlock.c

/*
 * test_urcu.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.
 */

#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 <errno.h>

#include <urcu/arch.h>
#include <urcu/tls-compat.h>
#include "cpuset.h"
#include "thread-id.h"

/* hardcoded number of CPUs */
#define NR_CPUS 16384

#ifndef DYNAMIC_LINK_TEST
#define _LGPL_SOURCE
#endif
#include <urcu.h>

struct test_array {
	int a;
};

pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;

static volatile int test_go, test_stop;

static unsigned long wdelay;

static volatile struct test_array test_array = { 8 };

static unsigned long duration;

/* read-side C.S. duration, in loops */
static unsigned long rduration;

/* write-side C.S. duration, in loops */
static unsigned long wduration;

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

static int verbose_mode;

#define printf_verbose(fmt, args...)		\
	do {					\
		if (verbose_mode)		\
			printf(fmt, args);	\
	} while (0)

static unsigned int cpu_affinities[NR_CPUS];
static unsigned int next_aff = 0;
static int use_affinity = 0;

pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;

static void set_affinity(void)
{
#if HAVE_SCHED_SETAFFINITY
	cpu_set_t mask;
	int cpu, ret;
#endif /* HAVE_SCHED_SETAFFINITY */

	if (!use_affinity)
		return;

#if HAVE_SCHED_SETAFFINITY
	ret = pthread_mutex_lock(&affinity_mutex);
	if (ret) {
		perror("Error in pthread mutex lock");
		exit(-1);
	}
	cpu = cpu_affinities[next_aff++];
	ret = pthread_mutex_unlock(&affinity_mutex);
	if (ret) {
		perror("Error in pthread mutex unlock");
		exit(-1);
	}

	CPU_ZERO(&mask);
	CPU_SET(cpu, &mask);
#if SCHED_SETAFFINITY_ARGS == 2
	sched_setaffinity(0, &mask);
#else
	sched_setaffinity(0, sizeof(mask), &mask);
#endif
#endif /* HAVE_SCHED_SETAFFINITY */
}

/*
 * returns 0 if test should end.
 */
static int test_duration_write(void)
{
	return !test_stop;
}

static int test_duration_read(void)
{
	return !test_stop;
}

static DEFINE_URCU_TLS(unsigned long long, nr_writes);
static DEFINE_URCU_TLS(unsigned long long, nr_reads);

static unsigned int nr_readers;
static unsigned int nr_writers;

pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;

void rcu_copy_mutex_lock(void)
{
	int ret;
	ret = pthread_mutex_lock(&rcu_copy_mutex);
	if (ret) {
		perror("Error in pthread mutex lock");
		exit(-1);
	}
}

void rcu_copy_mutex_unlock(void)
{
	int ret;

	ret = pthread_mutex_unlock(&rcu_copy_mutex);
	if (ret) {
		perror("Error in pthread mutex unlock");
		exit(-1);
	}
}

void *thr_reader(void *_count)
{
	unsigned long long *count = _count;

	printf_verbose("thread_begin %s, tid %lu\n",
			"reader", urcu_get_thread_id());

	set_affinity();

	while (!test_go)
	{
	}

	for (;;) {
		int a;

		pthread_rwlock_rdlock(&lock);
		a = test_array.a;
		assert(a == 8);
		if (caa_unlikely(rduration))
			loop_sleep(rduration);
		pthread_rwlock_unlock(&lock);
		URCU_TLS(nr_reads)++;
		if (caa_unlikely(!test_duration_read()))
			break;
	}

	*count = URCU_TLS(nr_reads);
	printf_verbose("thread_end %s, tid %lu\n",
			"reader", urcu_get_thread_id());
	return ((void*)1);

}

void *thr_writer(void *_count)
{
	unsigned long long *count = _count;

	printf_verbose("thread_begin %s, tid %lu\n",
			"writer", urcu_get_thread_id());

	set_affinity();

	while (!test_go)
	{
	}
	cmm_smp_mb();

	for (;;) {
		pthread_rwlock_wrlock(&lock);
		test_array.a = 0;
		test_array.a = 8;
		if (caa_unlikely(wduration))
			loop_sleep(wduration);
		pthread_rwlock_unlock(&lock);
		URCU_TLS(nr_writes)++;
		if (caa_unlikely(!test_duration_write()))
			break;
		if (caa_unlikely(wdelay))
			loop_sleep(wdelay);
	}

	printf_verbose("thread_end %s, tid %lu\n",
			"writer", urcu_get_thread_id());
	*count = URCU_TLS(nr_writes);
	return ((void*)2);
}

void show_usage(int argc, char **argv)
{
	printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
		argv[0]);
	printf("OPTIONS:\n");
	printf("	[-d delay] (writer period (us))\n");
	printf("	[-c duration] (reader C.S. duration (in loops))\n");
	printf("	[-e duration] (writer C.S. duration (in loops))\n");
	printf("	[-v] (verbose output)\n");
	printf("	[-a cpu#] [-a cpu#]... (affinity)\n");
	printf("\n");
}

int main(int argc, char **argv)
{
	int err;
	pthread_t *tid_reader, *tid_writer;
	void *tret;
	unsigned long long *count_reader, *count_writer;
	unsigned long long tot_reads = 0, tot_writes = 0;
	int i, a;

	if (argc < 4) {
		show_usage(argc, argv);
		return -1;
	}
	cmm_smp_mb();

	err = sscanf(argv[1], "%u", &nr_readers);
	if (err != 1) {
		show_usage(argc, argv);
		return -1;
	}

	err = sscanf(argv[2], "%u", &nr_writers);
	if (err != 1) {
		show_usage(argc, argv);
		return -1;
	}
	
	err = sscanf(argv[3], "%lu", &duration);
	if (err != 1) {
		show_usage(argc, argv);
		return -1;
	}

	for (i = 4; i < argc; i++) {
		if (argv[i][0] != '-')
			continue;
		switch (argv[i][1]) {
		case 'a':
			if (argc < i + 2) {
				show_usage(argc, argv);
				return -1;
			}
			a = atoi(argv[++i]);
			cpu_affinities[next_aff++] = a;
			use_affinity = 1;
			printf_verbose("Adding CPU %d affinity\n", a);
			break;
		case 'c':
			if (argc < i + 2) {
				show_usage(argc, argv);
				return -1;
			}
			rduration = atol(argv[++i]);
			break;
		case 'd':
			if (argc < i + 2) {
				show_usage(argc, argv);
				return -1;
			}
			wdelay = atol(argv[++i]);
			break;
		case 'e':
			if (argc < i + 2) {
				show_usage(argc, argv);
				return -1;
			}
			wduration = atol(argv[++i]);
			break;
		case 'v':
			verbose_mode = 1;
			break;
		}
	}

	printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
		duration, nr_readers, nr_writers);
	printf_verbose("Writer delay : %lu loops.\n", wdelay);
	printf_verbose("Reader duration : %lu loops.\n", rduration);
	printf_verbose("thread %-6s, tid %lu\n",
			"main", urcu_get_thread_id());

	tid_reader = calloc(nr_readers, sizeof(*tid_reader));
	tid_writer = calloc(nr_writers, sizeof(*tid_writer));
	count_reader = calloc(nr_readers, sizeof(*count_reader));
	count_writer = calloc(nr_writers, sizeof(*count_writer));

	next_aff = 0;

	for (i = 0; i < nr_readers; i++) {
		err = pthread_create(&tid_reader[i], NULL, thr_reader,
				     &count_reader[i]);
		if (err != 0)
			exit(1);
	}
	for (i = 0; i < nr_writers; i++) {
		err = pthread_create(&tid_writer[i], NULL, thr_writer,
				     &count_writer[i]);
		if (err != 0)
			exit(1);
	}

	cmm_smp_mb();

	test_go = 1;

	sleep(duration);

	test_stop = 1;

	for (i = 0; i < nr_readers; i++) {
		err = pthread_join(tid_reader[i], &tret);
		if (err != 0)
			exit(1);
		tot_reads += count_reader[i];
	}
	for (i = 0; i < nr_writers; i++) {
		err = pthread_join(tid_writer[i], &tret);
		if (err != 0)
			exit(1);
		tot_writes += count_writer[i];
	}

	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
	       tot_writes);
	printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
		"nr_writers %3u "
		"wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
		argv[0], duration, nr_readers, rduration, wduration,
		nr_writers, wdelay, tot_reads, tot_writes,
		tot_reads + tot_writes);

	free(tid_reader);
	free(tid_writer);
	free(count_reader);
	free(count_writer);
	return 0;
}
Commit	Line	Data
10c48e14 MD	1	/*
	2	* test_urcu.c
	3	*
	4	* Userspace RCU library - test program
	5	*
6982d6d7	6	* Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10c48e14 MD	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	#include <stdio.h>
	24	#include <pthread.h>
	25	#include <stdlib.h>
	26	#include <string.h>
	27	#include <sys/types.h>
	28	#include <sys/wait.h>
	29	#include <unistd.h>
	30	#include <stdio.h>
	31	#include <assert.h>
94b343fd	32	#include <errno.h>
10c48e14	33
ec4e58a3	34	#include <urcu/arch.h>
bd252a04	35	#include <urcu/tls-compat.h>
2953b501	36	#include "cpuset.h"
94df6318	37	#include "thread-id.h"
65fcc7e9	38
2a7ac59d MD	39	/* hardcoded number of CPUs */
	40	#define NR_CPUS 16384
	41
10c48e14 MD	42	#ifndef DYNAMIC_LINK_TEST
10c48e14 MD	43	#define _LGPL_SOURCE
10c48e14	44	#endif
ec4e58a3	45	#include <urcu.h>
10c48e14 MD	46
	47	struct test_array {
	48	int a;
	49	};
	50
	51	pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
	52
78efb485	53	static volatile int test_go, test_stop;
10c48e14	54
9e31d0f0	55	static unsigned long wdelay;
10c48e14	56
2b4e4125	57	static volatile struct test_array test_array = { 8 };
10c48e14 MD	58
10c48e14 MD	59	static unsigned long duration;
10c48e14	60
daddf5b0	61	/* read-side C.S. duration, in loops */
8b632bab MD	62	static unsigned long rduration;
8b632bab MD	63
31b598e0 MD	64	/* write-side C.S. duration, in loops */
	65	static unsigned long wduration;
	66
ab0aacbe	67	static inline void loop_sleep(unsigned long loops)
daddf5b0	68	{
ab0aacbe	69	while (loops-- != 0)
06f22bdb	70	caa_cpu_relax();
daddf5b0 MD	71	}
daddf5b0 MD	72
4bad7d45 MD	73	static int verbose_mode;
	74
	75	#define printf_verbose(fmt, args...) \
	76	do { \
	77	if (verbose_mode) \
	78	printf(fmt, args); \
	79	} while (0)
	80
2a7ac59d MD	81	static unsigned int cpu_affinities[NR_CPUS];
	82	static unsigned int next_aff = 0;
	83	static int use_affinity = 0;
	84
6af882ba MD	85	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
6af882ba MD	86
2a7ac59d MD	87	static void set_affinity(void)
2a7ac59d MD	88	{
95bc7fb9	89	#if HAVE_SCHED_SETAFFINITY
2a7ac59d	90	cpu_set_t mask;
95bc7fb9 MD	91	int cpu, ret;
95bc7fb9 MD	92	#endif /* HAVE_SCHED_SETAFFINITY */
2a7ac59d MD	93
	94	if (!use_affinity)
	95	return;
	96
d8540fc5	97	#if HAVE_SCHED_SETAFFINITY
6af882ba MD	98	ret = pthread_mutex_lock(&affinity_mutex);
	99	if (ret) {
	100	perror("Error in pthread mutex lock");
	101	exit(-1);
	102	}
2a7ac59d	103	cpu = cpu_affinities[next_aff++];
6af882ba MD	104	ret = pthread_mutex_unlock(&affinity_mutex);
	105	if (ret) {
	106	perror("Error in pthread mutex unlock");
	107	exit(-1);
	108	}
d8540fc5	109
2a7ac59d MD	110	CPU_ZERO(&mask);
2a7ac59d MD	111	CPU_SET(cpu, &mask);
d8540fc5 PA	112	#if SCHED_SETAFFINITY_ARGS == 2
	113	sched_setaffinity(0, &mask);
	114	#else
2a7ac59d	115	sched_setaffinity(0, sizeof(mask), &mask);
d8540fc5 PA	116	#endif
d8540fc5 PA	117	#endif /* HAVE_SCHED_SETAFFINITY */
2a7ac59d MD	118	}
2a7ac59d MD	119
10c48e14 MD	120	/*
	121	* returns 0 if test should end.
	122	*/
	123	static int test_duration_write(void)
	124	{
78efb485	125	return !test_stop;
10c48e14 MD	126	}
	127
	128	static int test_duration_read(void)
	129	{
78efb485	130	return !test_stop;
10c48e14 MD	131	}
10c48e14 MD	132
bd252a04 MD	133	static DEFINE_URCU_TLS(unsigned long long, nr_writes);
bd252a04 MD	134	static DEFINE_URCU_TLS(unsigned long long, nr_reads);
10c48e14 MD	135
	136	static unsigned int nr_readers;
	137	static unsigned int nr_writers;
	138
	139	pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
	140
	141	void rcu_copy_mutex_lock(void)
	142	{
	143	int ret;
	144	ret = pthread_mutex_lock(&rcu_copy_mutex);
	145	if (ret) {
	146	perror("Error in pthread mutex lock");
	147	exit(-1);
	148	}
	149	}
	150
	151	void rcu_copy_mutex_unlock(void)
	152	{
	153	int ret;
	154
	155	ret = pthread_mutex_unlock(&rcu_copy_mutex);
	156	if (ret) {
	157	perror("Error in pthread mutex unlock");
	158	exit(-1);
	159	}
	160	}
	161
	162	void thr_reader(void _count)
	163	{
	164	unsigned long long *count = _count;
	165
94df6318 MD	166	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	167	"reader", urcu_get_thread_id());
10c48e14	168
2a7ac59d MD	169	set_affinity();
2a7ac59d MD	170
10c48e14 MD	171	while (!test_go)
	172	{
	173	}
	174
	175	for (;;) {
efa8d2c8 MD	176	int a;
efa8d2c8 MD	177
10c48e14	178	pthread_rwlock_rdlock(&lock);
efa8d2c8 MD	179	a = test_array.a;
efa8d2c8 MD	180	assert(a == 8);
a0b7f7ea	181	if (caa_unlikely(rduration))
daddf5b0	182	loop_sleep(rduration);
10c48e14	183	pthread_rwlock_unlock(&lock);
bd252a04	184	URCU_TLS(nr_reads)++;
a0b7f7ea	185	if (caa_unlikely(!test_duration_read()))
10c48e14 MD	186	break;
	187	}
	188
bd252a04	189	*count = URCU_TLS(nr_reads);
94df6318 MD	190	printf_verbose("thread_end %s, tid %lu\n",
94df6318 MD	191	"reader", urcu_get_thread_id());
10c48e14 MD	192	return ((void*)1);
	193
	194	}
	195
	196	void thr_writer(void _count)
	197	{
	198	unsigned long long *count = _count;
	199
94df6318 MD	200	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	201	"writer", urcu_get_thread_id());
10c48e14	202
2a7ac59d MD	203	set_affinity();
2a7ac59d MD	204
10c48e14 MD	205	while (!test_go)
	206	{
	207	}
5481ddb3	208	cmm_smp_mb();
10c48e14 MD	209
	210	for (;;) {
	211	pthread_rwlock_wrlock(&lock);
2b4e4125	212	test_array.a = 0;
10c48e14	213	test_array.a = 8;
a0b7f7ea	214	if (caa_unlikely(wduration))
31b598e0	215	loop_sleep(wduration);
10c48e14	216	pthread_rwlock_unlock(&lock);
bd252a04	217	URCU_TLS(nr_writes)++;
a0b7f7ea	218	if (caa_unlikely(!test_duration_write()))
10c48e14	219	break;
a0b7f7ea	220	if (caa_unlikely(wdelay))
9e31d0f0	221	loop_sleep(wdelay);
10c48e14 MD	222	}
10c48e14 MD	223
94df6318 MD	224	printf_verbose("thread_end %s, tid %lu\n",
94df6318 MD	225	"writer", urcu_get_thread_id());
bd252a04	226	*count = URCU_TLS(nr_writes);
10c48e14 MD	227	return ((void*)2);
	228	}
	229
	230	void show_usage(int argc, char **argv)
	231	{
06637138 MD	232	printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
	233	argv[0]);
	234	printf("OPTIONS:\n");
06637138 MD	235	printf(" [-d delay] (writer period (us))\n");
	236	printf(" [-c duration] (reader C.S. duration (in loops))\n");
	237	printf(" [-e duration] (writer C.S. duration (in loops))\n");
	238	printf(" [-v] (verbose output)\n");
	239	printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
10c48e14 MD	240	printf("\n");
	241	}
	242
	243	int main(int argc, char **argv)
	244	{
	245	int err;
	246	pthread_t tid_reader, tid_writer;
	247	void *tret;
	248	unsigned long long count_reader, count_writer;
	249	unsigned long long tot_reads = 0, tot_writes = 0;
9e97e478	250	int i, a;
10c48e14 MD	251
	252	if (argc < 4) {
	253	show_usage(argc, argv);
	254	return -1;
	255	}
5481ddb3	256	cmm_smp_mb();
10c48e14 MD	257
	258	err = sscanf(argv[1], "%u", &nr_readers);
	259	if (err != 1) {
	260	show_usage(argc, argv);
	261	return -1;
	262	}
	263
	264	err = sscanf(argv[2], "%u", &nr_writers);
	265	if (err != 1) {
	266	show_usage(argc, argv);
	267	return -1;
	268	}
	269
	270	err = sscanf(argv[3], "%lu", &duration);
	271	if (err != 1) {
	272	show_usage(argc, argv);
	273	return -1;
	274	}
	275
	276	for (i = 4; i < argc; i++) {
	277	if (argv[i][0] != '-')
	278	continue;
	279	switch (argv[i][1]) {
9e97e478 MD	280	case 'a':
	281	if (argc < i + 2) {
	282	show_usage(argc, argv);
	283	return -1;
	284	}
	285	a = atoi(argv[++i]);
2a7ac59d	286	cpu_affinities[next_aff++] = a;
9e97e478	287	use_affinity = 1;
4bad7d45	288	printf_verbose("Adding CPU %d affinity\n", a);
9e97e478	289	break;
8b632bab MD	290	case 'c':
	291	if (argc < i + 2) {
	292	show_usage(argc, argv);
	293	return -1;
	294	}
9e31d0f0	295	rduration = atol(argv[++i]);
8b632bab	296	break;
10c48e14 MD	297	case 'd':
	298	if (argc < i + 2) {
	299	show_usage(argc, argv);
	300	return -1;
	301	}
9e31d0f0	302	wdelay = atol(argv[++i]);
10c48e14	303	break;
31b598e0 MD	304	case 'e':
	305	if (argc < i + 2) {
	306	show_usage(argc, argv);
	307	return -1;
	308	}
	309	wduration = atol(argv[++i]);
	310	break;
4bad7d45 MD	311	case 'v':
	312	verbose_mode = 1;
	313	break;
10c48e14 MD	314	}
	315	}
	316
4bad7d45	317	printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
10c48e14	318	duration, nr_readers, nr_writers);
9e31d0f0	319	printf_verbose("Writer delay : %lu loops.\n", wdelay);
4bad7d45	320	printf_verbose("Reader duration : %lu loops.\n", rduration);
94df6318 MD	321	printf_verbose("thread %-6s, tid %lu\n",
94df6318 MD	322	"main", urcu_get_thread_id());
10c48e14	323
9aa14175 MD	324	tid_reader = calloc(nr_readers, sizeof(*tid_reader));
	325	tid_writer = calloc(nr_writers, sizeof(*tid_writer));
	326	count_reader = calloc(nr_readers, sizeof(*count_reader));
	327	count_writer = calloc(nr_writers, sizeof(*count_writer));
10c48e14	328
2a7ac59d MD	329	next_aff = 0;
2a7ac59d MD	330
10c48e14 MD	331	for (i = 0; i < nr_readers; i++) {
	332	err = pthread_create(&tid_reader[i], NULL, thr_reader,
	333	&count_reader[i]);
	334	if (err != 0)
	335	exit(1);
	336	}
	337	for (i = 0; i < nr_writers; i++) {
	338	err = pthread_create(&tid_writer[i], NULL, thr_writer,
	339	&count_writer[i]);
	340	if (err != 0)
	341	exit(1);
	342	}
	343
5481ddb3	344	cmm_smp_mb();
10c48e14	345
78efb485 MD	346	test_go = 1;
	347
	348	sleep(duration);
	349
	350	test_stop = 1;
	351
10c48e14 MD	352	for (i = 0; i < nr_readers; i++) {
	353	err = pthread_join(tid_reader[i], &tret);
	354	if (err != 0)
	355	exit(1);
	356	tot_reads += count_reader[i];
	357	}
	358	for (i = 0; i < nr_writers; i++) {
	359	err = pthread_join(tid_writer[i], &tret);
	360	if (err != 0)
	361	exit(1);
	362	tot_writes += count_writer[i];
	363	}
4bad7d45 MD	364
4bad7d45 MD	365	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
10c48e14	366	tot_writes);
a50a7b43	367	printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
cda3c71d	368	"nr_writers %3u "
9e31d0f0	369	"wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
a50a7b43	370	argv[0], duration, nr_readers, rduration, wduration,
4bad7d45 MD	371	nr_writers, wdelay, tot_reads, tot_writes,
	372	tot_reads + tot_writes);
	373
10c48e14 MD	374	free(tid_reader);
	375	free(tid_writer);
	376	free(count_reader);
	377	free(count_writer);
	378	return 0;
	379	}