[urcu.git] / tests / test_urcu.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"

#ifdef __linux__
#include <syscall.h>
#endif

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

#if defined(_syscall0)
_syscall0(pid_t, gettid)
#elif defined(__NR_gettid)
static inline pid_t gettid(void)
{
	return syscall(__NR_gettid);
}
#else
#warning "use pid as tid"
static inline pid_t gettid(void)
{
	return getpid();
}
#endif

#ifndef DYNAMIC_LINK_TEST
#define _LGPL_SOURCE
#else
#define rcu_debug_yield_read()
#endif
#include <urcu.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);
#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;
	int *local_ptr;

	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
			"reader", (unsigned long) pthread_self(),
			(unsigned long) gettid());

	set_affinity();

	rcu_register_thread();
	assert(!rcu_read_ongoing());

	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)++;
		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, thread id : %lx, tid %lu\n",
			"reader", (unsigned long) pthread_self(),
			(unsigned long) gettid());
	return ((void*)1);

}

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

	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
			"writer", (unsigned long) pthread_self(),
			(unsigned long) gettid());

	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, thread id : %lx, tid %lu\n",
			"writer", (unsigned long) pthread_self(),
			(unsigned long) gettid());
	*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");
#ifdef DEBUG_YIELD
	printf("	[-r] [-w] (yield reader and/or writer)\n");
#endif
	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;
	}

	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]) {
#ifdef DEBUG_YIELD
		case 'r':
			rcu_yield_active |= RCU_YIELD_READ;
			break;
		case 'w':
			rcu_yield_active |= RCU_YIELD_WRITE;
			break;
#endif
		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, thread id : %lx, tid %lu\n",
			"main", (unsigned long) pthread_self(),
			(unsigned long)gettid());

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

	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(test_rcu_pointer);
	free(tid_reader);
	free(tid_writer);
	free(count_reader);
	free(count_writer);
	return 0;
}
Commit	Line	Data
	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
	23	#define _GNU_SOURCE
	24	#include "../config.h"
	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>
	34	#include <errno.h>
	35
	36	#include <urcu/arch.h>
	37	#include <urcu/tls-compat.h>
	38	#include "cpuset.h"
	39
	40	#ifdef __linux__
	41	#include <syscall.h>
	42	#endif
	43
	44	/* hardcoded number of CPUs */
	45	#define NR_CPUS 16384
	46
	47	#if defined(_syscall0)
	48	_syscall0(pid_t, gettid)
	49	#elif defined(__NR_gettid)
	50	static inline pid_t gettid(void)
	51	{
	52	return syscall(__NR_gettid);
	53	}
	54	#else
	55	#warning "use pid as tid"
	56	static inline pid_t gettid(void)
	57	{
	58	return getpid();
	59	}
	60	#endif
	61
	62	#ifndef DYNAMIC_LINK_TEST
	63	#define _LGPL_SOURCE
	64	#else
	65	#define rcu_debug_yield_read()
	66	#endif
	67	#include <urcu.h>
	68
	69	static volatile int test_go, test_stop;
	70
	71	static unsigned long wdelay;
	72
	73	static int *test_rcu_pointer;
	74
	75	static unsigned long duration;
	76
	77	/* read-side C.S. duration, in loops */
	78	static unsigned long rduration;
	79
	80	/* write-side C.S. duration, in loops */
	81	static unsigned long wduration;
	82
	83	static inline void loop_sleep(unsigned long loops)
	84	{
	85	while (loops-- != 0)
	86	caa_cpu_relax();
	87	}
	88
	89	static int verbose_mode;
	90
	91	#define printf_verbose(fmt, args...) \
	92	do { \
	93	if (verbose_mode) \
	94	printf(fmt, args); \
	95	} while (0)
	96
	97	static unsigned int cpu_affinities[NR_CPUS];
	98	static unsigned int next_aff = 0;
	99	static int use_affinity = 0;
	100
	101	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
	102
	103	static void set_affinity(void)
	104	{
	105	#if HAVE_SCHED_SETAFFINITY
	106	cpu_set_t mask;
	107	int cpu, ret;
	108	#endif /* HAVE_SCHED_SETAFFINITY */
	109
	110	if (!use_affinity)
	111	return;
	112
	113	#if HAVE_SCHED_SETAFFINITY
	114	ret = pthread_mutex_lock(&affinity_mutex);
	115	if (ret) {
	116	perror("Error in pthread mutex lock");
	117	exit(-1);
	118	}
	119	cpu = cpu_affinities[next_aff++];
	120	ret = pthread_mutex_unlock(&affinity_mutex);
	121	if (ret) {
	122	perror("Error in pthread mutex unlock");
	123	exit(-1);
	124	}
	125
	126	CPU_ZERO(&mask);
	127	CPU_SET(cpu, &mask);
	128	#if SCHED_SETAFFINITY_ARGS == 2
	129	sched_setaffinity(0, &mask);
	130	#else
	131	sched_setaffinity(0, sizeof(mask), &mask);
	132	#endif
	133	#endif /* HAVE_SCHED_SETAFFINITY */
	134	}
	135
	136	/*
	137	* returns 0 if test should end.
	138	*/
	139	static int test_duration_write(void)
	140	{
	141	return !test_stop;
	142	}
	143
	144	static int test_duration_read(void)
	145	{
	146	return !test_stop;
	147	}
	148
	149	static DEFINE_URCU_TLS(unsigned long long, nr_writes);
	150	static DEFINE_URCU_TLS(unsigned long long, nr_reads);
	151
	152	static unsigned int nr_readers;
	153	static unsigned int nr_writers;
	154
	155	pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
	156
	157	void rcu_copy_mutex_lock(void)
	158	{
	159	int ret;
	160	ret = pthread_mutex_lock(&rcu_copy_mutex);
	161	if (ret) {
	162	perror("Error in pthread mutex lock");
	163	exit(-1);
	164	}
	165	}
	166
	167	void rcu_copy_mutex_unlock(void)
	168	{
	169	int ret;
	170
	171	ret = pthread_mutex_unlock(&rcu_copy_mutex);
	172	if (ret) {
	173	perror("Error in pthread mutex unlock");
	174	exit(-1);
	175	}
	176	}
	177
	178	void thr_reader(void _count)
	179	{
	180	unsigned long long *count = _count;
	181	int *local_ptr;
	182
	183	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
	184	"reader", (unsigned long) pthread_self(),
	185	(unsigned long) gettid());
	186
	187	set_affinity();
	188
	189	rcu_register_thread();
	190	assert(!rcu_read_ongoing());
	191
	192	while (!test_go)
	193	{
	194	}
	195	cmm_smp_mb();
	196
	197	for (;;) {
	198	rcu_read_lock();
	199	assert(rcu_read_ongoing());
	200	local_ptr = rcu_dereference(test_rcu_pointer);
	201	rcu_debug_yield_read();
	202	if (local_ptr)
	203	assert(*local_ptr == 8);
	204	if (caa_unlikely(rduration))
	205	loop_sleep(rduration);
	206	rcu_read_unlock();
	207	URCU_TLS(nr_reads)++;
	208	if (caa_unlikely(!test_duration_read()))
	209	break;
	210	}
	211
	212	rcu_unregister_thread();
	213
	214	/* test extra thread registration */
	215	rcu_register_thread();
	216	rcu_unregister_thread();
	217
	218	*count = URCU_TLS(nr_reads);
	219	printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
	220	"reader", (unsigned long) pthread_self(),
	221	(unsigned long) gettid());
	222	return ((void*)1);
	223
	224	}
	225
	226	void thr_writer(void _count)
	227	{
	228	unsigned long long *count = _count;
	229	int new, old;
	230
	231	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
	232	"writer", (unsigned long) pthread_self(),
	233	(unsigned long) gettid());
	234
	235	set_affinity();
	236
	237	while (!test_go)
	238	{
	239	}
	240	cmm_smp_mb();
	241
	242	for (;;) {
	243	new = malloc(sizeof(int));
	244	assert(new);
	245	*new = 8;
	246	old = rcu_xchg_pointer(&test_rcu_pointer, new);
	247	if (caa_unlikely(wduration))
	248	loop_sleep(wduration);
	249	synchronize_rcu();
	250	if (old)
	251	*old = 0;
	252	free(old);
	253	URCU_TLS(nr_writes)++;
	254	if (caa_unlikely(!test_duration_write()))
	255	break;
	256	if (caa_unlikely(wdelay))
	257	loop_sleep(wdelay);
	258	}
	259
	260	printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
	261	"writer", (unsigned long) pthread_self(),
	262	(unsigned long) gettid());
	263	*count = URCU_TLS(nr_writes);
	264	return ((void*)2);
	265	}
	266
	267	void show_usage(int argc, char **argv)
	268	{
	269	printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
	270	argv[0]);
	271	printf("OPTIONS:\n");
	272	#ifdef DEBUG_YIELD
	273	printf(" [-r] [-w] (yield reader and/or writer)\n");
	274	#endif
	275	printf(" [-d delay] (writer period (us))\n");
	276	printf(" [-c duration] (reader C.S. duration (in loops))\n");
	277	printf(" [-e duration] (writer C.S. duration (in loops))\n");
	278	printf(" [-v] (verbose output)\n");
	279	printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
	280	printf("\n");
	281	}
	282
	283	int main(int argc, char **argv)
	284	{
	285	int err;
	286	pthread_t tid_reader, tid_writer;
	287	void *tret;
	288	unsigned long long count_reader, count_writer;
	289	unsigned long long tot_reads = 0, tot_writes = 0;
	290	int i, a;
	291
	292	if (argc < 4) {
	293	show_usage(argc, argv);
	294	return -1;
	295	}
	296
	297	err = sscanf(argv[1], "%u", &nr_readers);
	298	if (err != 1) {
	299	show_usage(argc, argv);
	300	return -1;
	301	}
	302
	303	err = sscanf(argv[2], "%u", &nr_writers);
	304	if (err != 1) {
	305	show_usage(argc, argv);
	306	return -1;
	307	}
	308
	309	err = sscanf(argv[3], "%lu", &duration);
	310	if (err != 1) {
	311	show_usage(argc, argv);
	312	return -1;
	313	}
	314
	315	for (i = 4; i < argc; i++) {
	316	if (argv[i][0] != '-')
	317	continue;
	318	switch (argv[i][1]) {
	319	#ifdef DEBUG_YIELD
	320	case 'r':
	321	rcu_yield_active \|= RCU_YIELD_READ;
	322	break;
	323	case 'w':
	324	rcu_yield_active \|= RCU_YIELD_WRITE;
	325	break;
	326	#endif
	327	case 'a':
	328	if (argc < i + 2) {
	329	show_usage(argc, argv);
	330	return -1;
	331	}
	332	a = atoi(argv[++i]);
	333	cpu_affinities[next_aff++] = a;
	334	use_affinity = 1;
	335	printf_verbose("Adding CPU %d affinity\n", a);
	336	break;
	337	case 'c':
	338	if (argc < i + 2) {
	339	show_usage(argc, argv);
	340	return -1;
	341	}
	342	rduration = atol(argv[++i]);
	343	break;
	344	case 'd':
	345	if (argc < i + 2) {
	346	show_usage(argc, argv);
	347	return -1;
	348	}
	349	wdelay = atol(argv[++i]);
	350	break;
	351	case 'e':
	352	if (argc < i + 2) {
	353	show_usage(argc, argv);
	354	return -1;
	355	}
	356	wduration = atol(argv[++i]);
	357	break;
	358	case 'v':
	359	verbose_mode = 1;
	360	break;
	361	}
	362	}
	363
	364	printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
	365	duration, nr_readers, nr_writers);
	366	printf_verbose("Writer delay : %lu loops.\n", wdelay);
	367	printf_verbose("Reader duration : %lu loops.\n", rduration);
	368	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
	369	"main", (unsigned long) pthread_self(),
	370	(unsigned long)gettid());
	371
	372	tid_reader = malloc(sizeof(tid_reader) nr_readers);
	373	tid_writer = malloc(sizeof(tid_writer) nr_writers);
	374	count_reader = malloc(sizeof(count_reader) nr_readers);
	375	count_writer = malloc(sizeof(count_writer) nr_writers);
	376
	377	next_aff = 0;
	378
	379	for (i = 0; i < nr_readers; i++) {
	380	err = pthread_create(&tid_reader[i], NULL, thr_reader,
	381	&count_reader[i]);
	382	if (err != 0)
	383	exit(1);
	384	}
	385	for (i = 0; i < nr_writers; i++) {
	386	err = pthread_create(&tid_writer[i], NULL, thr_writer,
	387	&count_writer[i]);
	388	if (err != 0)
	389	exit(1);
	390	}
	391
	392	cmm_smp_mb();
	393
	394	test_go = 1;
	395
	396	sleep(duration);
	397
	398	test_stop = 1;
	399
	400	for (i = 0; i < nr_readers; i++) {
	401	err = pthread_join(tid_reader[i], &tret);
	402	if (err != 0)
	403	exit(1);
	404	tot_reads += count_reader[i];
	405	}
	406	for (i = 0; i < nr_writers; i++) {
	407	err = pthread_join(tid_writer[i], &tret);
	408	if (err != 0)
	409	exit(1);
	410	tot_writes += count_writer[i];
	411	}
	412
	413	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
	414	tot_writes);
	415	printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
	416	"nr_writers %3u "
	417	"wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
	418	argv[0], duration, nr_readers, rduration, wduration,
	419	nr_writers, wdelay, tot_reads, tot_writes,
	420	tot_reads + tot_writes);
	421	free(test_rcu_pointer);
	422	free(tid_reader);
	423	free(tid_writer);
	424	free(count_reader);
	425	free(count_writer);
	426	return 0;
	427	}