[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.
 */

#define _GNU_SOURCE
#include "config.h"
#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
9e97e478	23	#define _GNU_SOURCE
f5ab766e	24	#include "config.h"
10c48e14 MD	25	#include <stdio.h>
	26	#include <pthread.h>
	27	#include <stdlib.h>
	28	#include <string.h>
	29	#include <sys/types.h>
	30	#include <sys/wait.h>
	31	#include <unistd.h>
	32	#include <stdio.h>
	33	#include <assert.h>
94b343fd	34	#include <errno.h>
10c48e14	35
ec4e58a3	36	#include <urcu/arch.h>
bd252a04	37	#include <urcu/tls-compat.h>
2953b501	38	#include "cpuset.h"
94df6318	39	#include "thread-id.h"
65fcc7e9	40
2a7ac59d MD	41	/* hardcoded number of CPUs */
	42	#define NR_CPUS 16384
	43
10c48e14 MD	44	#ifndef DYNAMIC_LINK_TEST
10c48e14 MD	45	#define _LGPL_SOURCE
10c48e14	46	#endif
ec4e58a3	47	#include <urcu.h>
10c48e14 MD	48
	49	struct test_array {
	50	int a;
	51	};
	52
	53	pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
	54
78efb485	55	static volatile int test_go, test_stop;
10c48e14	56
9e31d0f0	57	static unsigned long wdelay;
10c48e14	58
2b4e4125	59	static volatile struct test_array test_array = { 8 };
10c48e14 MD	60
10c48e14 MD	61	static unsigned long duration;
10c48e14	62
daddf5b0	63	/* read-side C.S. duration, in loops */
8b632bab MD	64	static unsigned long rduration;
8b632bab MD	65
31b598e0 MD	66	/* write-side C.S. duration, in loops */
	67	static unsigned long wduration;
	68
ab0aacbe	69	static inline void loop_sleep(unsigned long loops)
daddf5b0	70	{
ab0aacbe	71	while (loops-- != 0)
06f22bdb	72	caa_cpu_relax();
daddf5b0 MD	73	}
daddf5b0 MD	74
4bad7d45 MD	75	static int verbose_mode;
	76
	77	#define printf_verbose(fmt, args...) \
	78	do { \
	79	if (verbose_mode) \
	80	printf(fmt, args); \
	81	} while (0)
	82
2a7ac59d MD	83	static unsigned int cpu_affinities[NR_CPUS];
	84	static unsigned int next_aff = 0;
	85	static int use_affinity = 0;
	86
6af882ba MD	87	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
6af882ba MD	88
2a7ac59d MD	89	static void set_affinity(void)
2a7ac59d MD	90	{
95bc7fb9	91	#if HAVE_SCHED_SETAFFINITY
2a7ac59d	92	cpu_set_t mask;
95bc7fb9 MD	93	int cpu, ret;
95bc7fb9 MD	94	#endif /* HAVE_SCHED_SETAFFINITY */
2a7ac59d MD	95
	96	if (!use_affinity)
	97	return;
	98
d8540fc5	99	#if HAVE_SCHED_SETAFFINITY
6af882ba MD	100	ret = pthread_mutex_lock(&affinity_mutex);
	101	if (ret) {
	102	perror("Error in pthread mutex lock");
	103	exit(-1);
	104	}
2a7ac59d	105	cpu = cpu_affinities[next_aff++];
6af882ba MD	106	ret = pthread_mutex_unlock(&affinity_mutex);
	107	if (ret) {
	108	perror("Error in pthread mutex unlock");
	109	exit(-1);
	110	}
d8540fc5	111
2a7ac59d MD	112	CPU_ZERO(&mask);
2a7ac59d MD	113	CPU_SET(cpu, &mask);
d8540fc5 PA	114	#if SCHED_SETAFFINITY_ARGS == 2
	115	sched_setaffinity(0, &mask);
	116	#else
2a7ac59d	117	sched_setaffinity(0, sizeof(mask), &mask);
d8540fc5 PA	118	#endif
d8540fc5 PA	119	#endif /* HAVE_SCHED_SETAFFINITY */
2a7ac59d MD	120	}
2a7ac59d MD	121
10c48e14 MD	122	/*
	123	* returns 0 if test should end.
	124	*/
	125	static int test_duration_write(void)
	126	{
78efb485	127	return !test_stop;
10c48e14 MD	128	}
	129
	130	static int test_duration_read(void)
	131	{
78efb485	132	return !test_stop;
10c48e14 MD	133	}
10c48e14 MD	134
bd252a04 MD	135	static DEFINE_URCU_TLS(unsigned long long, nr_writes);
bd252a04 MD	136	static DEFINE_URCU_TLS(unsigned long long, nr_reads);
10c48e14 MD	137
	138	static unsigned int nr_readers;
	139	static unsigned int nr_writers;
	140
	141	pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
	142
	143	void rcu_copy_mutex_lock(void)
	144	{
	145	int ret;
	146	ret = pthread_mutex_lock(&rcu_copy_mutex);
	147	if (ret) {
	148	perror("Error in pthread mutex lock");
	149	exit(-1);
	150	}
	151	}
	152
	153	void rcu_copy_mutex_unlock(void)
	154	{
	155	int ret;
	156
	157	ret = pthread_mutex_unlock(&rcu_copy_mutex);
	158	if (ret) {
	159	perror("Error in pthread mutex unlock");
	160	exit(-1);
	161	}
	162	}
	163
	164	void thr_reader(void _count)
	165	{
	166	unsigned long long *count = _count;
	167
94df6318 MD	168	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	169	"reader", urcu_get_thread_id());
10c48e14	170
2a7ac59d MD	171	set_affinity();
2a7ac59d MD	172
10c48e14 MD	173	while (!test_go)
	174	{
	175	}
	176
	177	for (;;) {
efa8d2c8 MD	178	int a;
efa8d2c8 MD	179
10c48e14	180	pthread_rwlock_rdlock(&lock);
efa8d2c8 MD	181	a = test_array.a;
efa8d2c8 MD	182	assert(a == 8);
a0b7f7ea	183	if (caa_unlikely(rduration))
daddf5b0	184	loop_sleep(rduration);
10c48e14	185	pthread_rwlock_unlock(&lock);
bd252a04	186	URCU_TLS(nr_reads)++;
a0b7f7ea	187	if (caa_unlikely(!test_duration_read()))
10c48e14 MD	188	break;
	189	}
	190
bd252a04	191	*count = URCU_TLS(nr_reads);
94df6318 MD	192	printf_verbose("thread_end %s, tid %lu\n",
94df6318 MD	193	"reader", urcu_get_thread_id());
10c48e14 MD	194	return ((void*)1);
	195
	196	}
	197
	198	void thr_writer(void _count)
	199	{
	200	unsigned long long *count = _count;
	201
94df6318 MD	202	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	203	"writer", urcu_get_thread_id());
10c48e14	204
2a7ac59d MD	205	set_affinity();
2a7ac59d MD	206
10c48e14 MD	207	while (!test_go)
	208	{
	209	}
5481ddb3	210	cmm_smp_mb();
10c48e14 MD	211
	212	for (;;) {
	213	pthread_rwlock_wrlock(&lock);
2b4e4125	214	test_array.a = 0;
10c48e14	215	test_array.a = 8;
a0b7f7ea	216	if (caa_unlikely(wduration))
31b598e0	217	loop_sleep(wduration);
10c48e14	218	pthread_rwlock_unlock(&lock);
bd252a04	219	URCU_TLS(nr_writes)++;
a0b7f7ea	220	if (caa_unlikely(!test_duration_write()))
10c48e14	221	break;
a0b7f7ea	222	if (caa_unlikely(wdelay))
9e31d0f0	223	loop_sleep(wdelay);
10c48e14 MD	224	}
10c48e14 MD	225
94df6318 MD	226	printf_verbose("thread_end %s, tid %lu\n",
94df6318 MD	227	"writer", urcu_get_thread_id());
bd252a04	228	*count = URCU_TLS(nr_writes);
10c48e14 MD	229	return ((void*)2);
	230	}
	231
	232	void show_usage(int argc, char **argv)
	233	{
06637138 MD	234	printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
	235	argv[0]);
	236	printf("OPTIONS:\n");
06637138 MD	237	printf(" [-d delay] (writer period (us))\n");
	238	printf(" [-c duration] (reader C.S. duration (in loops))\n");
	239	printf(" [-e duration] (writer C.S. duration (in loops))\n");
	240	printf(" [-v] (verbose output)\n");
	241	printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
10c48e14 MD	242	printf("\n");
	243	}
	244
	245	int main(int argc, char **argv)
	246	{
	247	int err;
	248	pthread_t tid_reader, tid_writer;
	249	void *tret;
	250	unsigned long long count_reader, count_writer;
	251	unsigned long long tot_reads = 0, tot_writes = 0;
9e97e478	252	int i, a;
10c48e14 MD	253
	254	if (argc < 4) {
	255	show_usage(argc, argv);
	256	return -1;
	257	}
5481ddb3	258	cmm_smp_mb();
10c48e14 MD	259
	260	err = sscanf(argv[1], "%u", &nr_readers);
	261	if (err != 1) {
	262	show_usage(argc, argv);
	263	return -1;
	264	}
	265
	266	err = sscanf(argv[2], "%u", &nr_writers);
	267	if (err != 1) {
	268	show_usage(argc, argv);
	269	return -1;
	270	}
	271
	272	err = sscanf(argv[3], "%lu", &duration);
	273	if (err != 1) {
	274	show_usage(argc, argv);
	275	return -1;
	276	}
	277
	278	for (i = 4; i < argc; i++) {
	279	if (argv[i][0] != '-')
	280	continue;
	281	switch (argv[i][1]) {
9e97e478 MD	282	case 'a':
	283	if (argc < i + 2) {
	284	show_usage(argc, argv);
	285	return -1;
	286	}
	287	a = atoi(argv[++i]);
2a7ac59d	288	cpu_affinities[next_aff++] = a;
9e97e478	289	use_affinity = 1;
4bad7d45	290	printf_verbose("Adding CPU %d affinity\n", a);
9e97e478	291	break;
8b632bab MD	292	case 'c':
	293	if (argc < i + 2) {
	294	show_usage(argc, argv);
	295	return -1;
	296	}
9e31d0f0	297	rduration = atol(argv[++i]);
8b632bab	298	break;
10c48e14 MD	299	case 'd':
	300	if (argc < i + 2) {
	301	show_usage(argc, argv);
	302	return -1;
	303	}
9e31d0f0	304	wdelay = atol(argv[++i]);
10c48e14	305	break;
31b598e0 MD	306	case 'e':
	307	if (argc < i + 2) {
	308	show_usage(argc, argv);
	309	return -1;
	310	}
	311	wduration = atol(argv[++i]);
	312	break;
4bad7d45 MD	313	case 'v':
	314	verbose_mode = 1;
	315	break;
10c48e14 MD	316	}
	317	}
	318
4bad7d45	319	printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
10c48e14	320	duration, nr_readers, nr_writers);
9e31d0f0	321	printf_verbose("Writer delay : %lu loops.\n", wdelay);
4bad7d45	322	printf_verbose("Reader duration : %lu loops.\n", rduration);
94df6318 MD	323	printf_verbose("thread %-6s, tid %lu\n",
94df6318 MD	324	"main", urcu_get_thread_id());
10c48e14	325
9aa14175 MD	326	tid_reader = calloc(nr_readers, sizeof(*tid_reader));
	327	tid_writer = calloc(nr_writers, sizeof(*tid_writer));
	328	count_reader = calloc(nr_readers, sizeof(*count_reader));
	329	count_writer = calloc(nr_writers, sizeof(*count_writer));
10c48e14	330
2a7ac59d MD	331	next_aff = 0;
2a7ac59d MD	332
10c48e14 MD	333	for (i = 0; i < nr_readers; i++) {
	334	err = pthread_create(&tid_reader[i], NULL, thr_reader,
	335	&count_reader[i]);
	336	if (err != 0)
	337	exit(1);
	338	}
	339	for (i = 0; i < nr_writers; i++) {
	340	err = pthread_create(&tid_writer[i], NULL, thr_writer,
	341	&count_writer[i]);
	342	if (err != 0)
	343	exit(1);
	344	}
	345
5481ddb3	346	cmm_smp_mb();
10c48e14	347
78efb485 MD	348	test_go = 1;
	349
	350	sleep(duration);
	351
	352	test_stop = 1;
	353
10c48e14 MD	354	for (i = 0; i < nr_readers; i++) {
	355	err = pthread_join(tid_reader[i], &tret);
	356	if (err != 0)
	357	exit(1);
	358	tot_reads += count_reader[i];
	359	}
	360	for (i = 0; i < nr_writers; i++) {
	361	err = pthread_join(tid_writer[i], &tret);
	362	if (err != 0)
	363	exit(1);
	364	tot_writes += count_writer[i];
	365	}
4bad7d45 MD	366
4bad7d45 MD	367	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
10c48e14	368	tot_writes);
a50a7b43	369	printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
cda3c71d	370	"nr_writers %3u "
9e31d0f0	371	"wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
a50a7b43	372	argv[0], duration, nr_readers, rduration, wduration,
4bad7d45 MD	373	nr_writers, wdelay, tot_reads, tot_writes,
	374	tot_reads + tot_writes);
	375
10c48e14 MD	376	free(tid_reader);
	377	free(tid_writer);
	378	free(count_reader);
	379	free(count_writer);
	380	return 0;
	381	}