[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 <errno.h>

#include <urcu/arch.h>
#include <urcu/assert.h>
#include <urcu/tls-compat.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)
{
#ifdef HAVE_SCHED_SETAFFINITY
	cpu_set_t mask;
	int cpu, ret;
#endif /* HAVE_SCHED_SETAFFINITY */

	if (!use_affinity)
		return;

#ifdef 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_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();

	urcu_posix_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(unsigned long long *nr_dequeues_l)
{
	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_l)++;
		}
	} while (snode);
}

static void show_usage(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;
	unsigned int i_thr;

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

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

	err = sscanf(argv[2], "%u", &nr_enqueuers);
	if (err != 1) {
		show_usage(argv);
		return -1;
	}

	err = sscanf(argv[3], "%lu", &duration);
	if (err != 1) {
		show_usage(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(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(argv);
				return -1;
			}
			rduration = atol(argv[++i]);
			break;
		case 'd':
			if (argc < i + 2) {
				show_usage(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_thr = 0; i_thr < nr_enqueuers; i_thr++) {
		err = pthread_create(&tid_enqueuer[i_thr], NULL, thr_enqueuer,
				     &count_enqueuer[2 * i_thr]);
		if (err != 0)
			exit(1);
	}
	for (i_thr = 0; i_thr < nr_dequeuers; i_thr++) {
		err = pthread_create(&tid_dequeuer[i_thr], NULL, thr_dequeuer,
				     &count_dequeuer[2 * i_thr]);
		if (err != 0)
			exit(1);
	}

	cmm_smp_mb();

	test_go = 1;

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

	test_stop = 1;

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

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