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

/*
 * test_urcu_lfs.c
 *
 * Userspace RCU library - example lock-free stack
 *
 * Copyright 2010-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 * Copyright February 2010 - Paolo Bonzini <pbonzini@redhat.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 <stdint.h>
#include <stdbool.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>
#include <urcu/cds.h>

#define POISON_PTR	((void *) 0x42UL)

/*
 * External synchronization used.
 */
enum test_sync {
	TEST_SYNC_NONE = 0,
	TEST_SYNC_RCU,
};

static enum test_sync test_sync;

static volatile int test_go, test_stop;

static unsigned long rduration;

static unsigned long duration;

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

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

static int verbose_mode;

static int test_pop, test_pop_all;

#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_dequeue(void)
{
	return !test_stop;
}

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

static DEFINE_URCU_TLS(unsigned long long, nr_dequeues);
static DEFINE_URCU_TLS(unsigned long long, nr_enqueues);

static DEFINE_URCU_TLS(unsigned long long, nr_successful_dequeues);
static DEFINE_URCU_TLS(unsigned long long, nr_successful_enqueues);

static unsigned int nr_enqueuers;
static unsigned int nr_dequeuers;

struct test {
	struct cds_lfs_node list;
	struct rcu_head rcu;
};

static struct cds_lfs_stack s;

static void *thr_enqueuer(void *_count)
{
	unsigned long long *count = _count;

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

	set_affinity();

	rcu_register_thread();

	while (!test_go)
	{
	}
	cmm_smp_mb();

	for (;;) {
		struct test *node = malloc(sizeof(*node));
		if (!node)
			goto fail;
		cds_lfs_node_init(&node->list);
		cds_lfs_push(&s, &node->list);
		URCU_TLS(nr_successful_enqueues)++;

		if (caa_unlikely(wdelay))
			loop_sleep(wdelay);
fail:
		URCU_TLS(nr_enqueues)++;
		if (caa_unlikely(!test_duration_enqueue()))
			break;
	}

	rcu_unregister_thread();

	count[0] = URCU_TLS(nr_enqueues);
	count[1] = URCU_TLS(nr_successful_enqueues);
	printf_verbose("enqueuer thread_end, tid %lu, "
			"enqueues %llu successful_enqueues %llu\n",
			urcu_get_thread_id(),
			URCU_TLS(nr_enqueues),
			URCU_TLS(nr_successful_enqueues));
	return ((void*)1);

}

static
void free_node_cb(struct rcu_head *head)
{
	struct test *node =
		caa_container_of(head, struct test, rcu);
	free(node);
}

static
void do_test_pop(enum test_sync sync)
{
	struct cds_lfs_node *snode;

	if (sync == TEST_SYNC_RCU)
		rcu_read_lock();
	snode = __cds_lfs_pop(&s);
	if (sync == TEST_SYNC_RCU)
		rcu_read_unlock();
	if (snode) {
		struct test *node;

		snode->next = POISON_PTR;
		node = caa_container_of(snode,
			struct test, list);
		if (sync == TEST_SYNC_RCU)
			call_rcu(&node->rcu, free_node_cb);
		else
			free(node);
		URCU_TLS(nr_successful_dequeues)++;
	}
	URCU_TLS(nr_dequeues)++;
}

static
void do_test_pop_all(enum test_sync sync)
{
	struct cds_lfs_node *snode;
	struct cds_lfs_head *head;
	struct cds_lfs_node *n;

	head = __cds_lfs_pop_all(&s);
	cds_lfs_for_each_safe(head, snode, n) {
		struct test *node;

		snode->next = POISON_PTR;
		node = caa_container_of(snode, struct test, list);
		if (sync == TEST_SYNC_RCU)
			call_rcu(&node->rcu, free_node_cb);
		else
			free(node);
		URCU_TLS(nr_successful_dequeues)++;
		URCU_TLS(nr_dequeues)++;
	}

}

static void *thr_dequeuer(void *_count)
{
	unsigned long long *count = _count;
	unsigned int counter = 0;

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

	set_affinity();

	rcu_register_thread();

	while (!test_go)
	{
	}
	cmm_smp_mb();

	assert(test_pop || test_pop_all);

	for (;;) {
		if (test_pop && test_pop_all) {
			/* both pop and pop all */
			if (counter & 1)
				do_test_pop(test_sync);
			else
				do_test_pop_all(test_sync);
			counter++;
		} else {
			if (test_pop)
				do_test_pop(test_sync);
			else
				do_test_pop_all(test_sync);
		}

		if (caa_unlikely(!test_duration_dequeue()))
			break;
		if (caa_unlikely(rduration))
			loop_sleep(rduration);
	}

	rcu_unregister_thread();

	printf_verbose("dequeuer thread_end, tid %lu, "
			"dequeues %llu, successful_dequeues %llu\n",
			urcu_get_thread_id(),
			URCU_TLS(nr_dequeues),
			URCU_TLS(nr_successful_dequeues));
	count[0] = URCU_TLS(nr_dequeues);
	count[1] = URCU_TLS(nr_successful_dequeues);
	return ((void*)2);
}

static void test_end(struct cds_lfs_stack *s, unsigned long long *nr_dequeues)
{
	struct cds_lfs_node *snode;

	do {
		snode = __cds_lfs_pop(s);
		if (snode) {
			struct test *node;

			node = caa_container_of(snode, struct test, list);
			free(node);
			(*nr_dequeues)++;
		}
	} while (snode);
}

static void show_usage(int argc, char **argv)
{
	printf("Usage : %s nr_dequeuers nr_enqueuers duration (s) <OPTIONS>\n",
		argv[0]);
	printf("OPTIONS:\n");
	printf("	[-d delay] (enqueuer period (in loops))\n");
	printf("	[-c duration] (dequeuer period (in loops))\n");
	printf("	[-v] (verbose output)\n");
	printf("	[-a cpu#] [-a cpu#]... (affinity)\n");
	printf("	[-p] (test pop)\n");
	printf("	[-P] (test pop_all, enabled by default)\n");
	printf("	[-R] (use RCU external synchronization)\n");
	printf("		Note: default: no external synchronization used.\n");
	printf("\n");
}

int main(int argc, char **argv)
{
	int err;
	pthread_t *tid_enqueuer, *tid_dequeuer;
	void *tret;
	unsigned long long *count_enqueuer, *count_dequeuer;
	unsigned long long tot_enqueues = 0, tot_dequeues = 0;
	unsigned long long tot_successful_enqueues = 0,
			   tot_successful_dequeues = 0;
	unsigned long long end_dequeues = 0;
	int i, a;

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

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

	err = sscanf(argv[2], "%u", &nr_enqueuers);
	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 'v':
			verbose_mode = 1;
			break;
		case 'p':
			test_pop = 1;
			break;
		case 'P':
			test_pop_all = 1;
			break;
		case 'R':
			test_sync = TEST_SYNC_RCU;
			break;
		}
	}

	/* activate pop_all test by default */
	if (!test_pop && !test_pop_all)
		test_pop_all = 1;

	printf_verbose("running test for %lu seconds, %u enqueuers, "
		       "%u dequeuers.\n",
		       duration, nr_enqueuers, nr_dequeuers);
	if (test_pop)
		printf_verbose("pop test activated.\n");
	if (test_pop_all)
		printf_verbose("pop_all test activated.\n");
	if (test_sync == TEST_SYNC_RCU)
		printf_verbose("External sync: RCU.\n");
	else
		printf_verbose("External sync: none.\n");
	printf_verbose("Writer delay : %lu loops.\n", rduration);
	printf_verbose("Reader duration : %lu loops.\n", wdelay);
	printf_verbose("thread %-6s, tid %lu\n",
			"main", urcu_get_thread_id());

	tid_enqueuer = calloc(nr_enqueuers, sizeof(*tid_enqueuer));
	tid_dequeuer = calloc(nr_dequeuers, sizeof(*tid_dequeuer));
	count_enqueuer = calloc(nr_enqueuers, 2 * sizeof(*count_enqueuer));
	count_dequeuer = calloc(nr_dequeuers, 2 * sizeof(*count_dequeuer));
	cds_lfs_init(&s);
	err = create_all_cpu_call_rcu_data(0);
	if (err) {
		printf("Per-CPU call_rcu() worker threads unavailable. Using default global worker thread.\n");
	}

	next_aff = 0;

	for (i = 0; i < nr_enqueuers; i++) {
		err = pthread_create(&tid_enqueuer[i], NULL, thr_enqueuer,
				     &count_enqueuer[2 * i]);
		if (err != 0)
			exit(1);
	}
	for (i = 0; i < nr_dequeuers; i++) {
		err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer,
				     &count_dequeuer[2 * i]);
		if (err != 0)
			exit(1);
	}

	cmm_smp_mb();

	test_go = 1;

	for (i = 0; i < duration; i++) {
		sleep(1);
		if (verbose_mode) {
			fwrite(".", sizeof(char), 1, stdout);
			fflush(stdout);
		}
	}

	test_stop = 1;

	for (i = 0; i < nr_enqueuers; i++) {
		err = pthread_join(tid_enqueuer[i], &tret);
		if (err != 0)
			exit(1);
		tot_enqueues += count_enqueuer[2 * i];
		tot_successful_enqueues += count_enqueuer[2 * i + 1];
	}
	for (i = 0; i < nr_dequeuers; i++) {
		err = pthread_join(tid_dequeuer[i], &tret);
		if (err != 0)
			exit(1);
		tot_dequeues += count_dequeuer[2 * i];
		tot_successful_dequeues += count_dequeuer[2 * i + 1];
	}
	
	test_end(&s, &end_dequeues);

	printf_verbose("total number of enqueues : %llu, dequeues %llu\n",
		       tot_enqueues, tot_dequeues);
	printf_verbose("total number of successful enqueues : %llu, "
		       "successful dequeues %llu\n",
		       tot_successful_enqueues, tot_successful_dequeues);
	printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu "
		"nr_dequeuers %3u "
		"rdur %6lu nr_enqueues %12llu nr_dequeues %12llu "
		"successful enqueues %12llu successful dequeues %12llu "
		"end_dequeues %llu nr_ops %12llu\n",
		argv[0], duration, nr_enqueuers, wdelay,
		nr_dequeuers, rduration, tot_enqueues, tot_dequeues,
		tot_successful_enqueues,
		tot_successful_dequeues, end_dequeues,
		tot_enqueues + tot_dequeues);
	if (tot_successful_enqueues != tot_successful_dequeues + end_dequeues)
		printf("WARNING! Discrepancy between nr succ. enqueues %llu vs "
		       "succ. dequeues + end dequeues %llu.\n",
		       tot_successful_enqueues,
		       tot_successful_dequeues + end_dequeues);

	free_all_cpu_call_rcu_data();
	cds_lfs_destroy(&s);
	free(count_enqueuer);
	free(count_dequeuer);
	free(tid_enqueuer);
	free(tid_dequeuer);
	return 0;
}
Commit	Line	Data
	1	/*
	2	* test_urcu_lfs.c
	3	*
	4	* Userspace RCU library - example lock-free stack
	5	*
	6	* Copyright 2010-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	7	* Copyright February 2010 - Paolo Bonzini <pbonzini@redhat.com>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write to the Free Software Foundation, Inc.,
	21	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	22	*/
	23
	24	#include <stdio.h>
	25	#include <pthread.h>
	26	#include <stdlib.h>
	27	#include <stdint.h>
	28	#include <stdbool.h>
	29	#include <string.h>
	30	#include <sys/types.h>
	31	#include <sys/wait.h>
	32	#include <unistd.h>
	33	#include <stdio.h>
	34	#include <assert.h>
	35	#include <errno.h>
	36
	37	#include <urcu/arch.h>
	38	#include <urcu/tls-compat.h>
	39	#include "cpuset.h"
	40	#include "thread-id.h"
	41
	42	/* hardcoded number of CPUs */
	43	#define NR_CPUS 16384
	44
	45	#ifndef DYNAMIC_LINK_TEST
	46	#define _LGPL_SOURCE
	47	#endif
	48	#include <urcu.h>
	49	#include <urcu/cds.h>
	50
	51	#define POISON_PTR ((void *) 0x42UL)
	52
	53	/*
	54	* External synchronization used.
	55	*/
	56	enum test_sync {
	57	TEST_SYNC_NONE = 0,
	58	TEST_SYNC_RCU,
	59	};
	60
	61	static enum test_sync test_sync;
	62
	63	static volatile int test_go, test_stop;
	64
	65	static unsigned long rduration;
	66
	67	static unsigned long duration;
	68
	69	/* read-side C.S. duration, in loops */
	70	static unsigned long wdelay;
	71
	72	static inline void loop_sleep(unsigned long loops)
	73	{
	74	while (loops-- != 0)
	75	caa_cpu_relax();
	76	}
	77
	78	static int verbose_mode;
	79
	80	static int test_pop, test_pop_all;
	81
	82	#define printf_verbose(fmt, args...) \
	83	do { \
	84	if (verbose_mode) \
	85	printf(fmt, ## args); \
	86	} while (0)
	87
	88	static unsigned int cpu_affinities[NR_CPUS];
	89	static unsigned int next_aff = 0;
	90	static int use_affinity = 0;
	91
	92	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
	93
	94	static void set_affinity(void)
	95	{
	96	#if HAVE_SCHED_SETAFFINITY
	97	cpu_set_t mask;
	98	int cpu, ret;
	99	#endif /* HAVE_SCHED_SETAFFINITY */
	100
	101	if (!use_affinity)
	102	return;
	103
	104	#if HAVE_SCHED_SETAFFINITY
	105	ret = pthread_mutex_lock(&affinity_mutex);
	106	if (ret) {
	107	perror("Error in pthread mutex lock");
	108	exit(-1);
	109	}
	110	cpu = cpu_affinities[next_aff++];
	111	ret = pthread_mutex_unlock(&affinity_mutex);
	112	if (ret) {
	113	perror("Error in pthread mutex unlock");
	114	exit(-1);
	115	}
	116
	117	CPU_ZERO(&mask);
	118	CPU_SET(cpu, &mask);
	119	#if SCHED_SETAFFINITY_ARGS == 2
	120	sched_setaffinity(0, &mask);
	121	#else
	122	sched_setaffinity(0, sizeof(mask), &mask);
	123	#endif
	124	#endif /* HAVE_SCHED_SETAFFINITY */
	125	}
	126
	127	/*
	128	* returns 0 if test should end.
	129	*/
	130	static int test_duration_dequeue(void)
	131	{
	132	return !test_stop;
	133	}
	134
	135	static int test_duration_enqueue(void)
	136	{
	137	return !test_stop;
	138	}
	139
	140	static DEFINE_URCU_TLS(unsigned long long, nr_dequeues);
	141	static DEFINE_URCU_TLS(unsigned long long, nr_enqueues);
	142
	143	static DEFINE_URCU_TLS(unsigned long long, nr_successful_dequeues);
	144	static DEFINE_URCU_TLS(unsigned long long, nr_successful_enqueues);
	145
	146	static unsigned int nr_enqueuers;
	147	static unsigned int nr_dequeuers;
	148
	149	struct test {
	150	struct cds_lfs_node list;
	151	struct rcu_head rcu;
	152	};
	153
	154	static struct cds_lfs_stack s;
	155
	156	static void thr_enqueuer(void _count)
	157	{
	158	unsigned long long *count = _count;
	159
	160	printf_verbose("thread_begin %s, tid %lu\n",
	161	"enqueuer", urcu_get_thread_id());
	162
	163	set_affinity();
	164
	165	rcu_register_thread();
	166
	167	while (!test_go)
	168	{
	169	}
	170	cmm_smp_mb();
	171
	172	for (;;) {
	173	struct test node = malloc(sizeof(node));
	174	if (!node)
	175	goto fail;
	176	cds_lfs_node_init(&node->list);
	177	cds_lfs_push(&s, &node->list);
	178	URCU_TLS(nr_successful_enqueues)++;
	179
	180	if (caa_unlikely(wdelay))
	181	loop_sleep(wdelay);
	182	fail:
	183	URCU_TLS(nr_enqueues)++;
	184	if (caa_unlikely(!test_duration_enqueue()))
	185	break;
	186	}
	187
	188	rcu_unregister_thread();
	189
	190	count[0] = URCU_TLS(nr_enqueues);
	191	count[1] = URCU_TLS(nr_successful_enqueues);
	192	printf_verbose("enqueuer thread_end, tid %lu, "
	193	"enqueues %llu successful_enqueues %llu\n",
	194	urcu_get_thread_id(),
	195	URCU_TLS(nr_enqueues),
	196	URCU_TLS(nr_successful_enqueues));
	197	return ((void*)1);
	198
	199	}
	200
	201	static
	202	void free_node_cb(struct rcu_head *head)
	203	{
	204	struct test *node =
	205	caa_container_of(head, struct test, rcu);
	206	free(node);
	207	}
	208
	209	static
	210	void do_test_pop(enum test_sync sync)
	211	{
	212	struct cds_lfs_node *snode;
	213
	214	if (sync == TEST_SYNC_RCU)
	215	rcu_read_lock();
	216	snode = __cds_lfs_pop(&s);
	217	if (sync == TEST_SYNC_RCU)
	218	rcu_read_unlock();
	219	if (snode) {
	220	struct test *node;
	221
	222	snode->next = POISON_PTR;
	223	node = caa_container_of(snode,
	224	struct test, list);
	225	if (sync == TEST_SYNC_RCU)
	226	call_rcu(&node->rcu, free_node_cb);
	227	else
	228	free(node);
	229	URCU_TLS(nr_successful_dequeues)++;
	230	}
	231	URCU_TLS(nr_dequeues)++;
	232	}
	233
	234	static
	235	void do_test_pop_all(enum test_sync sync)
	236	{
	237	struct cds_lfs_node *snode;
	238	struct cds_lfs_head *head;
	239	struct cds_lfs_node *n;
	240
	241	head = __cds_lfs_pop_all(&s);
	242	cds_lfs_for_each_safe(head, snode, n) {
	243	struct test *node;
	244
	245	snode->next = POISON_PTR;
	246	node = caa_container_of(snode, struct test, list);
	247	if (sync == TEST_SYNC_RCU)
	248	call_rcu(&node->rcu, free_node_cb);
	249	else
	250	free(node);
	251	URCU_TLS(nr_successful_dequeues)++;
	252	URCU_TLS(nr_dequeues)++;
	253	}
	254
	255	}
	256
	257	static void thr_dequeuer(void _count)
	258	{
	259	unsigned long long *count = _count;
	260	unsigned int counter = 0;
	261
	262	printf_verbose("thread_begin %s, tid %lu\n",
	263	"dequeuer", urcu_get_thread_id());
	264
	265	set_affinity();
	266
	267	rcu_register_thread();
	268
	269	while (!test_go)
	270	{
	271	}
	272	cmm_smp_mb();
	273
	274	assert(test_pop \|\| test_pop_all);
	275
	276	for (;;) {
	277	if (test_pop && test_pop_all) {
	278	/* both pop and pop all */
	279	if (counter & 1)
	280	do_test_pop(test_sync);
	281	else
	282	do_test_pop_all(test_sync);
	283	counter++;
	284	} else {
	285	if (test_pop)
	286	do_test_pop(test_sync);
	287	else
	288	do_test_pop_all(test_sync);
	289	}
	290
	291	if (caa_unlikely(!test_duration_dequeue()))
	292	break;
	293	if (caa_unlikely(rduration))
	294	loop_sleep(rduration);
	295	}
	296
	297	rcu_unregister_thread();
	298
	299	printf_verbose("dequeuer thread_end, tid %lu, "
	300	"dequeues %llu, successful_dequeues %llu\n",
	301	urcu_get_thread_id(),
	302	URCU_TLS(nr_dequeues),
	303	URCU_TLS(nr_successful_dequeues));
	304	count[0] = URCU_TLS(nr_dequeues);
	305	count[1] = URCU_TLS(nr_successful_dequeues);
	306	return ((void*)2);
	307	}
	308
	309	static void test_end(struct cds_lfs_stack s, unsigned long long nr_dequeues)
	310	{
	311	struct cds_lfs_node *snode;
	312
	313	do {
	314	snode = __cds_lfs_pop(s);
	315	if (snode) {
	316	struct test *node;
	317
	318	node = caa_container_of(snode, struct test, list);
	319	free(node);
	320	(*nr_dequeues)++;
	321	}
	322	} while (snode);
	323	}
	324
	325	static void show_usage(int argc, char **argv)
	326	{
	327	printf("Usage : %s nr_dequeuers nr_enqueuers duration (s) <OPTIONS>\n",
	328	argv[0]);
	329	printf("OPTIONS:\n");
	330	printf(" [-d delay] (enqueuer period (in loops))\n");
	331	printf(" [-c duration] (dequeuer period (in loops))\n");
	332	printf(" [-v] (verbose output)\n");
	333	printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
	334	printf(" [-p] (test pop)\n");
	335	printf(" [-P] (test pop_all, enabled by default)\n");
	336	printf(" [-R] (use RCU external synchronization)\n");
	337	printf(" Note: default: no external synchronization used.\n");
	338	printf("\n");
	339	}
	340
	341	int main(int argc, char **argv)
	342	{
	343	int err;
	344	pthread_t tid_enqueuer, tid_dequeuer;
	345	void *tret;
	346	unsigned long long count_enqueuer, count_dequeuer;
	347	unsigned long long tot_enqueues = 0, tot_dequeues = 0;
	348	unsigned long long tot_successful_enqueues = 0,
	349	tot_successful_dequeues = 0;
	350	unsigned long long end_dequeues = 0;
	351	int i, a;
	352
	353	if (argc < 4) {
	354	show_usage(argc, argv);
	355	return -1;
	356	}
	357
	358	err = sscanf(argv[1], "%u", &nr_dequeuers);
	359	if (err != 1) {
	360	show_usage(argc, argv);
	361	return -1;
	362	}
	363
	364	err = sscanf(argv[2], "%u", &nr_enqueuers);
	365	if (err != 1) {
	366	show_usage(argc, argv);
	367	return -1;
	368	}
	369
	370	err = sscanf(argv[3], "%lu", &duration);
	371	if (err != 1) {
	372	show_usage(argc, argv);
	373	return -1;
	374	}
	375
	376	for (i = 4; i < argc; i++) {
	377	if (argv[i][0] != '-')
	378	continue;
	379	switch (argv[i][1]) {
	380	case 'a':
	381	if (argc < i + 2) {
	382	show_usage(argc, argv);
	383	return -1;
	384	}
	385	a = atoi(argv[++i]);
	386	cpu_affinities[next_aff++] = a;
	387	use_affinity = 1;
	388	printf_verbose("Adding CPU %d affinity\n", a);
	389	break;
	390	case 'c':
	391	if (argc < i + 2) {
	392	show_usage(argc, argv);
	393	return -1;
	394	}
	395	rduration = atol(argv[++i]);
	396	break;
	397	case 'd':
	398	if (argc < i + 2) {
	399	show_usage(argc, argv);
	400	return -1;
	401	}
	402	wdelay = atol(argv[++i]);
	403	break;
	404	case 'v':
	405	verbose_mode = 1;
	406	break;
	407	case 'p':
	408	test_pop = 1;
	409	break;
	410	case 'P':
	411	test_pop_all = 1;
	412	break;
	413	case 'R':
	414	test_sync = TEST_SYNC_RCU;
	415	break;
	416	}
	417	}
	418
	419	/* activate pop_all test by default */
	420	if (!test_pop && !test_pop_all)
	421	test_pop_all = 1;
	422
	423	printf_verbose("running test for %lu seconds, %u enqueuers, "
	424	"%u dequeuers.\n",
	425	duration, nr_enqueuers, nr_dequeuers);
	426	if (test_pop)
	427	printf_verbose("pop test activated.\n");
	428	if (test_pop_all)
	429	printf_verbose("pop_all test activated.\n");
	430	if (test_sync == TEST_SYNC_RCU)
	431	printf_verbose("External sync: RCU.\n");
	432	else
	433	printf_verbose("External sync: none.\n");
	434	printf_verbose("Writer delay : %lu loops.\n", rduration);
	435	printf_verbose("Reader duration : %lu loops.\n", wdelay);
	436	printf_verbose("thread %-6s, tid %lu\n",
	437	"main", urcu_get_thread_id());
	438
	439	tid_enqueuer = calloc(nr_enqueuers, sizeof(*tid_enqueuer));
	440	tid_dequeuer = calloc(nr_dequeuers, sizeof(*tid_dequeuer));
	441	count_enqueuer = calloc(nr_enqueuers, 2 * sizeof(*count_enqueuer));
	442	count_dequeuer = calloc(nr_dequeuers, 2 * sizeof(*count_dequeuer));
	443	cds_lfs_init(&s);
	444	err = create_all_cpu_call_rcu_data(0);
	445	if (err) {
	446	printf("Per-CPU call_rcu() worker threads unavailable. Using default global worker thread.\n");
	447	}
	448
	449	next_aff = 0;
	450
	451	for (i = 0; i < nr_enqueuers; i++) {
	452	err = pthread_create(&tid_enqueuer[i], NULL, thr_enqueuer,
	453	&count_enqueuer[2 * i]);
	454	if (err != 0)
	455	exit(1);
	456	}
	457	for (i = 0; i < nr_dequeuers; i++) {
	458	err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer,
	459	&count_dequeuer[2 * i]);
	460	if (err != 0)
	461	exit(1);
	462	}
	463
	464	cmm_smp_mb();
	465
	466	test_go = 1;
	467
	468	for (i = 0; i < duration; i++) {
	469	sleep(1);
	470	if (verbose_mode) {
	471	fwrite(".", sizeof(char), 1, stdout);
	472	fflush(stdout);
	473	}
	474	}
	475
	476	test_stop = 1;
	477
	478	for (i = 0; i < nr_enqueuers; i++) {
	479	err = pthread_join(tid_enqueuer[i], &tret);
	480	if (err != 0)
	481	exit(1);
	482	tot_enqueues += count_enqueuer[2 * i];
	483	tot_successful_enqueues += count_enqueuer[2 * i + 1];
	484	}
	485	for (i = 0; i < nr_dequeuers; i++) {
	486	err = pthread_join(tid_dequeuer[i], &tret);
	487	if (err != 0)
	488	exit(1);
	489	tot_dequeues += count_dequeuer[2 * i];
	490	tot_successful_dequeues += count_dequeuer[2 * i + 1];
	491	}
	492
	493	test_end(&s, &end_dequeues);
	494
	495	printf_verbose("total number of enqueues : %llu, dequeues %llu\n",
	496	tot_enqueues, tot_dequeues);
	497	printf_verbose("total number of successful enqueues : %llu, "
	498	"successful dequeues %llu\n",
	499	tot_successful_enqueues, tot_successful_dequeues);
	500	printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu "
	501	"nr_dequeuers %3u "
	502	"rdur %6lu nr_enqueues %12llu nr_dequeues %12llu "
	503	"successful enqueues %12llu successful dequeues %12llu "
	504	"end_dequeues %llu nr_ops %12llu\n",
	505	argv[0], duration, nr_enqueuers, wdelay,
	506	nr_dequeuers, rduration, tot_enqueues, tot_dequeues,
	507	tot_successful_enqueues,
	508	tot_successful_dequeues, end_dequeues,
	509	tot_enqueues + tot_dequeues);
	510	if (tot_successful_enqueues != tot_successful_dequeues + end_dequeues)
	511	printf("WARNING! Discrepancy between nr succ. enqueues %llu vs "
	512	"succ. dequeues + end dequeues %llu.\n",
	513	tot_successful_enqueues,
	514	tot_successful_dequeues + end_dequeues);
	515
	516	free_all_cpu_call_rcu_data();
	517	cds_lfs_destroy(&s);
	518	free(count_enqueuer);
	519	free(count_dequeuer);
	520	free(tid_enqueuer);
	521	free(tid_dequeuer);
	522	return 0;
	523	}