[urcu.git] / tests / benchmark / test_urcu_qsbr.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 "thread-id.h"
#include "../common/debug-yield.h"

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

#ifndef DYNAMIC_LINK_TEST
#define _LGPL_SOURCE
#endif
#include "urcu-qsbr.h"

static volatile int test_go, test_stop;

static unsigned long wdelay;

static int *test_rcu_pointer;

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);
	sched_setaffinity(0, sizeof(mask), &mask);
#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;

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

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

	set_affinity();

	rcu_register_thread();

	assert(rcu_read_ongoing());
	rcu_thread_offline();
	assert(!rcu_read_ongoing());
	rcu_thread_online();

	while (!test_go)
	{
	}
	cmm_smp_mb();

	for (;;) {
		rcu_read_lock();
		assert(rcu_read_ongoing());
		local_ptr = rcu_dereference(test_rcu_pointer);
		rcu_debug_yield_read();
		if (local_ptr)
			assert(*local_ptr == 8);
		if (caa_unlikely(rduration))
			loop_sleep(rduration);
		rcu_read_unlock();
		URCU_TLS(nr_reads)++;
		/* QS each 1024 reads */
		if (caa_unlikely((URCU_TLS(nr_reads) & ((1 << 10) - 1)) == 0))
			rcu_quiescent_state();
		if (caa_unlikely(!test_duration_read()))
			break;
	}

	rcu_unregister_thread();

	/* test extra thread registration */
	rcu_register_thread();
	rcu_unregister_thread();

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

}

static
void *thr_writer(void *_count)
{
	unsigned long long *count = _count;
	int *new, *old;

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

	set_affinity();

	while (!test_go)
	{
	}
	cmm_smp_mb();

	for (;;) {
		new = malloc(sizeof(int));
		assert(new);
		*new = 8;
		old = rcu_xchg_pointer(&test_rcu_pointer, new);
		if (caa_unlikely(wduration))
			loop_sleep(wduration);
		synchronize_rcu();
		if (old)
			*old = 0;
		free(old);
		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);
}

static
void show_usage(int argc, char **argv)
{
	printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
		argv[0]);
	printf("OPTIONS:\n");
	printf("	[-r] [-w] (yield reader and/or writer)\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;
	unsigned int i_thr;

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

	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 'r':
			rcu_debug_yield_enable(RCU_YIELD_READ);
			break;
		case 'w':
			rcu_debug_yield_enable(RCU_YIELD_WRITE);
			break;
		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_thr = 0; i_thr < nr_readers; i_thr++) {
		err = pthread_create(&tid_reader[i_thr], NULL, thr_reader,
				     &count_reader[i_thr]);
		if (err != 0)
			exit(1);
	}
	for (i_thr = 0; i_thr < nr_writers; i_thr++) {
		err = pthread_create(&tid_writer[i_thr], NULL, thr_writer,
				     &count_writer[i_thr]);
		if (err != 0)
			exit(1);
	}

	cmm_smp_mb();

	test_go = 1;

	sleep(duration);

	test_stop = 1;

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

	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(test_rcu_pointer);
	free(tid_reader);
	free(tid_writer);
	free(count_reader);
	free(count_writer);
	return 0;
}
Commit	Line	Data
de10a585 MD	1	/*
	2	* test_urcu.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
de10a585 MD	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>
de10a585 MD	32	#include <errno.h>
	33
	34	#include <urcu/arch.h>
bd252a04	35	#include <urcu/tls-compat.h>
94df6318	36	#include "thread-id.h"
2650042a	37	#include "../common/debug-yield.h"
de10a585 MD	38
	39	/* hardcoded number of CPUs */
	40	#define NR_CPUS 16384
	41
de10a585 MD	42	#ifndef DYNAMIC_LINK_TEST
de10a585 MD	43	#define _LGPL_SOURCE
de10a585 MD	44	#endif
	45	#include "urcu-qsbr.h"
	46
de10a585 MD	47	static volatile int test_go, test_stop;
	48
	49	static unsigned long wdelay;
	50
bcc74df3	51	static int *test_rcu_pointer;
de10a585 MD	52
	53	static unsigned long duration;
	54
	55	/* read-side C.S. duration, in loops */
	56	static unsigned long rduration;
	57
	58	/* write-side C.S. duration, in loops */
	59	static unsigned long wduration;
	60
ab0aacbe	61	static inline void loop_sleep(unsigned long loops)
de10a585	62	{
ab0aacbe	63	while (loops-- != 0)
de10a585 MD	64	caa_cpu_relax();
	65	}
	66
	67	static int verbose_mode;
	68
	69	#define printf_verbose(fmt, args...) \
	70	do { \
	71	if (verbose_mode) \
	72	printf(fmt, args); \
	73	} while (0)
	74
	75	static unsigned int cpu_affinities[NR_CPUS];
	76	static unsigned int next_aff = 0;
	77	static int use_affinity = 0;
	78
	79	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
	80
de10a585 MD	81	static void set_affinity(void)
de10a585 MD	82	{
95bc7fb9	83	#if HAVE_SCHED_SETAFFINITY
de10a585	84	cpu_set_t mask;
95bc7fb9 MD	85	int cpu, ret;
95bc7fb9 MD	86	#endif /* HAVE_SCHED_SETAFFINITY */
de10a585 MD	87
	88	if (!use_affinity)
	89	return;
	90
	91	#if HAVE_SCHED_SETAFFINITY
	92	ret = pthread_mutex_lock(&affinity_mutex);
	93	if (ret) {
	94	perror("Error in pthread mutex lock");
	95	exit(-1);
	96	}
	97	cpu = cpu_affinities[next_aff++];
	98	ret = pthread_mutex_unlock(&affinity_mutex);
	99	if (ret) {
	100	perror("Error in pthread mutex unlock");
	101	exit(-1);
	102	}
	103	CPU_ZERO(&mask);
	104	CPU_SET(cpu, &mask);
de10a585	105	sched_setaffinity(0, sizeof(mask), &mask);
de10a585 MD	106	#endif /* HAVE_SCHED_SETAFFINITY */
	107	}
	108
	109	/*
	110	* returns 0 if test should end.
	111	*/
	112	static int test_duration_write(void)
	113	{
	114	return !test_stop;
	115	}
	116
	117	static int test_duration_read(void)
	118	{
	119	return !test_stop;
	120	}
	121
bd252a04 MD	122	static DEFINE_URCU_TLS(unsigned long long, nr_writes);
bd252a04 MD	123	static DEFINE_URCU_TLS(unsigned long long, nr_reads);
de10a585 MD	124
	125	static unsigned int nr_readers;
	126	static unsigned int nr_writers;
	127
	128	pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
	129
61c3fb60	130	static
de10a585 MD	131	void thr_reader(void _count)
	132	{
	133	unsigned long long *count = _count;
bcc74df3	134	int *local_ptr;
de10a585	135
94df6318 MD	136	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	137	"reader", urcu_get_thread_id());
de10a585 MD	138
	139	set_affinity();
	140
	141	rcu_register_thread();
	142
882f3357 MD	143	assert(rcu_read_ongoing());
	144	rcu_thread_offline();
	145	assert(!rcu_read_ongoing());
	146	rcu_thread_online();
	147
de10a585 MD	148	while (!test_go)
	149	{
	150	}
	151	cmm_smp_mb();
	152
	153	for (;;) {
	154	rcu_read_lock();
882f3357	155	assert(rcu_read_ongoing());
de10a585	156	local_ptr = rcu_dereference(test_rcu_pointer);
1de4df4b	157	rcu_debug_yield_read();
de10a585	158	if (local_ptr)
bcc74df3	159	assert(*local_ptr == 8);
a0b7f7ea	160	if (caa_unlikely(rduration))
de10a585 MD	161	loop_sleep(rduration);
de10a585 MD	162	rcu_read_unlock();
bd252a04	163	URCU_TLS(nr_reads)++;
de10a585	164	/* QS each 1024 reads */
bd252a04	165	if (caa_unlikely((URCU_TLS(nr_reads) & ((1 << 10) - 1)) == 0))
de10a585	166	rcu_quiescent_state();
a0b7f7ea	167	if (caa_unlikely(!test_duration_read()))
de10a585 MD	168	break;
	169	}
	170
	171	rcu_unregister_thread();
	172
	173	/* test extra thread registration */
	174	rcu_register_thread();
	175	rcu_unregister_thread();
	176
bd252a04	177	*count = URCU_TLS(nr_reads);
94df6318 MD	178	printf_verbose("thread_end %s, tid %lu\n",
94df6318 MD	179	"reader", urcu_get_thread_id());
de10a585 MD	180	return ((void*)1);
	181
	182	}
	183
61c3fb60	184	static
de10a585 MD	185	void thr_writer(void _count)
	186	{
	187	unsigned long long *count = _count;
bcc74df3	188	int new, old;
de10a585	189
94df6318 MD	190	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	191	"writer", urcu_get_thread_id());
de10a585 MD	192
	193	set_affinity();
	194
	195	while (!test_go)
	196	{
	197	}
	198	cmm_smp_mb();
	199
	200	for (;;) {
bcc74df3 MD	201	new = malloc(sizeof(int));
	202	assert(new);
	203	*new = 8;
de10a585	204	old = rcu_xchg_pointer(&test_rcu_pointer, new);
a0b7f7ea	205	if (caa_unlikely(wduration))
de10a585 MD	206	loop_sleep(wduration);
de10a585 MD	207	synchronize_rcu();
de10a585	208	if (old)
bcc74df3 MD	209	*old = 0;
bcc74df3 MD	210	free(old);
bd252a04	211	URCU_TLS(nr_writes)++;
a0b7f7ea	212	if (caa_unlikely(!test_duration_write()))
de10a585	213	break;
a0b7f7ea	214	if (caa_unlikely(wdelay))
de10a585 MD	215	loop_sleep(wdelay);
	216	}
	217
94df6318 MD	218	printf_verbose("thread_end %s, tid %lu\n",
94df6318 MD	219	"writer", urcu_get_thread_id());
bd252a04	220	*count = URCU_TLS(nr_writes);
de10a585 MD	221	return ((void*)2);
	222	}
	223
61c3fb60	224	static
de10a585 MD	225	void show_usage(int argc, char **argv)
de10a585 MD	226	{
06637138 MD	227	printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
	228	argv[0]);
	229	printf("OPTIONS:\n");
06637138	230	printf(" [-r] [-w] (yield reader and/or writer)\n");
06637138 MD	231	printf(" [-d delay] (writer period (us))\n");
	232	printf(" [-c duration] (reader C.S. duration (in loops))\n");
	233	printf(" [-e duration] (writer C.S. duration (in loops))\n");
	234	printf(" [-v] (verbose output)\n");
	235	printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
de10a585 MD	236	printf("\n");
	237	}
	238
	239	int main(int argc, char **argv)
	240	{
	241	int err;
	242	pthread_t tid_reader, tid_writer;
	243	void *tret;
	244	unsigned long long count_reader, count_writer;
	245	unsigned long long tot_reads = 0, tot_writes = 0;
	246	int i, a;
83e334d0	247	unsigned int i_thr;
de10a585 MD	248
	249	if (argc < 4) {
	250	show_usage(argc, argv);
	251	return -1;
	252	}
	253
	254	err = sscanf(argv[1], "%u", &nr_readers);
	255	if (err != 1) {
	256	show_usage(argc, argv);
	257	return -1;
	258	}
	259
	260	err = sscanf(argv[2], "%u", &nr_writers);
	261	if (err != 1) {
	262	show_usage(argc, argv);
	263	return -1;
	264	}
83e334d0	265
de10a585 MD	266	err = sscanf(argv[3], "%lu", &duration);
	267	if (err != 1) {
	268	show_usage(argc, argv);
	269	return -1;
	270	}
	271
	272	for (i = 4; i < argc; i++) {
	273	if (argv[i][0] != '-')
	274	continue;
	275	switch (argv[i][1]) {
de10a585	276	case 'r':
2650042a	277	rcu_debug_yield_enable(RCU_YIELD_READ);
de10a585 MD	278	break;
de10a585 MD	279	case 'w':
2650042a	280	rcu_debug_yield_enable(RCU_YIELD_WRITE);
de10a585	281	break;
de10a585 MD	282	case 'a':
	283	if (argc < i + 2) {
	284	show_usage(argc, argv);
	285	return -1;
	286	}
	287	a = atoi(argv[++i]);
	288	cpu_affinities[next_aff++] = a;
	289	use_affinity = 1;
	290	printf_verbose("Adding CPU %d affinity\n", a);
	291	break;
	292	case 'c':
	293	if (argc < i + 2) {
	294	show_usage(argc, argv);
	295	return -1;
	296	}
	297	rduration = atol(argv[++i]);
	298	break;
	299	case 'd':
	300	if (argc < i + 2) {
	301	show_usage(argc, argv);
	302	return -1;
	303	}
	304	wdelay = atol(argv[++i]);
	305	break;
	306	case 'e':
	307	if (argc < i + 2) {
	308	show_usage(argc, argv);
	309	return -1;
	310	}
	311	wduration = atol(argv[++i]);
	312	break;
	313	case 'v':
	314	verbose_mode = 1;
	315	break;
	316	}
	317	}
	318
	319	printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
	320	duration, nr_readers, nr_writers);
	321	printf_verbose("Writer delay : %lu loops.\n", wdelay);
	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());
de10a585	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));
de10a585 MD	330
	331	next_aff = 0;
	332
83e334d0 MJ	333	for (i_thr = 0; i_thr < nr_readers; i_thr++) {
	334	err = pthread_create(&tid_reader[i_thr], NULL, thr_reader,
	335	&count_reader[i_thr]);
de10a585 MD	336	if (err != 0)
	337	exit(1);
	338	}
83e334d0 MJ	339	for (i_thr = 0; i_thr < nr_writers; i_thr++) {
	340	err = pthread_create(&tid_writer[i_thr], NULL, thr_writer,
	341	&count_writer[i_thr]);
de10a585 MD	342	if (err != 0)
	343	exit(1);
	344	}
	345
	346	cmm_smp_mb();
	347
	348	test_go = 1;
	349
	350	sleep(duration);
	351
	352	test_stop = 1;
	353
83e334d0 MJ	354	for (i_thr = 0; i_thr < nr_readers; i_thr++) {
83e334d0 MJ	355	err = pthread_join(tid_reader[i_thr], &tret);
de10a585 MD	356	if (err != 0)
de10a585 MD	357	exit(1);
83e334d0	358	tot_reads += count_reader[i_thr];
de10a585	359	}
83e334d0 MJ	360	for (i_thr = 0; i_thr < nr_writers; i_thr++) {
83e334d0 MJ	361	err = pthread_join(tid_writer[i_thr], &tret);
de10a585 MD	362	if (err != 0)
de10a585 MD	363	exit(1);
83e334d0	364	tot_writes += count_writer[i_thr];
de10a585	365	}
83e334d0	366
de10a585 MD	367	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
	368	tot_writes);
	369	printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
	370	"nr_writers %3u "
	371	"wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
	372	argv[0], duration, nr_readers, rduration, wduration,
	373	nr_writers, wdelay, tot_reads, tot_writes,
	374	tot_reads + tot_writes);
bcc74df3	375	free(test_rcu_pointer);
de10a585 MD	376	free(tid_reader);
	377	free(tid_writer);
	378	free(count_reader);
	379	free(count_writer);
	380	return 0;
	381	}