[urcu.git] / tests / test_urcu_wfs.c

/*
 * test_urcu_wfs.c
 *
 * Userspace RCU library - example RCU-based lock-free stack
 *
 * Copyright February 2010 - 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.
 */

#define _GNU_SOURCE
#include "../config.h"
#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 <sched.h>
#include <errno.h>

#include <urcu/arch.h>
#include <urcu/tls-compat.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
#endif
#include <urcu.h>
#include <urcu/wfstack.h>

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

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;

#ifndef HAVE_CPU_SET_T
typedef unsigned long cpu_set_t;
# define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
# define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
#endif

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;

static struct cds_wfs_stack s;

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

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

	set_affinity();

	while (!test_go)
	{
	}
	cmm_smp_mb();

	for (;;) {
		struct cds_wfs_node *node = malloc(sizeof(*node));
		if (!node)
			goto fail;
		cds_wfs_node_init(node);
		cds_wfs_push(&s, node);
		URCU_TLS(nr_successful_enqueues)++;

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

	count[0] = URCU_TLS(nr_enqueues);
	count[1] = URCU_TLS(nr_successful_enqueues);
	printf_verbose("enqueuer thread_end, thread id : %lx, tid %lu, "
		       "enqueues %llu successful_enqueues %llu\n",
		       pthread_self(), (unsigned long)gettid(),
		       URCU_TLS(nr_enqueues), URCU_TLS(nr_successful_enqueues));
	return ((void*)1);

}

static void do_test_pop(enum test_sync sync)
{
	struct cds_wfs_node *node;

	if (sync == TEST_SYNC_MUTEX)
		cds_wfs_pop_lock(&s);
	node = __cds_wfs_pop_blocking(&s);
	if (sync == TEST_SYNC_MUTEX)
		cds_wfs_pop_unlock(&s);

	if (node) {
		free(node);
		URCU_TLS(nr_successful_dequeues)++;
	}
	URCU_TLS(nr_dequeues)++;
}

static void do_test_pop_all(enum test_sync sync)
{
	struct cds_wfs_head *head;
	struct cds_wfs_node *node, *n;

	if (sync == TEST_SYNC_MUTEX)
		cds_wfs_pop_lock(&s);
	head = __cds_wfs_pop_all(&s);
	if (sync == TEST_SYNC_MUTEX)
		cds_wfs_pop_unlock(&s);

	cds_wfs_for_each_blocking_safe(head, node, n) {
		free(node);
		URCU_TLS(nr_successful_dequeues)++;
		URCU_TLS(nr_dequeues)++;
	}
}

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

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

	set_affinity();

	while (!test_go)
	{
	}
	cmm_smp_mb();

	assert(test_pop || test_pop_all);

	for (;;) {
		if (test_pop && test_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);
	}

	printf_verbose("dequeuer thread_end, thread id : %lx, tid %lu, "
		       "dequeues %llu, successful_dequeues %llu\n",
		       pthread_self(), (unsigned long)gettid(),
		       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);
}

void test_end(struct cds_wfs_stack *s, unsigned long long *nr_dequeues)
{
	struct cds_wfs_node *node;

	do {
		node = cds_wfs_pop_blocking(s);
		if (node) {
			free(node);
			(*nr_dequeues)++;
		}
	} while (node);
}

void show_usage(int argc, char **argv)
{
	printf("Usage : %s nr_dequeuers nr_enqueuers duration (s)", argv[0]);
	printf(" [-d delay] (enqueuer period (in loops))");
	printf(" [-c duration] (dequeuer period (in loops))");
	printf(" [-v] (verbose output)");
	printf(" [-a cpu#] [-a cpu#]... (affinity)");
	printf(" [-p] (test pop)");
	printf(" [-P] (test pop_all, enabled by default)");
	printf(" [-M] (use mutex external synchronization)");
	printf("      Note: default: no external synchronization used.");
	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 'M':
			test_sync = TEST_SYNC_MUTEX;
			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");
	printf_verbose("Writer delay : %lu loops.\n", rduration);
	printf_verbose("Reader duration : %lu loops.\n", wdelay);
	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
			"main", pthread_self(), (unsigned long)gettid());

	tid_enqueuer = malloc(sizeof(*tid_enqueuer) * nr_enqueuers);
	tid_dequeuer = malloc(sizeof(*tid_dequeuer) * nr_dequeuers);
	count_enqueuer = malloc(2 * sizeof(*count_enqueuer) * nr_enqueuers);
	count_dequeuer = malloc(2 * sizeof(*count_dequeuer) * nr_dequeuers);
	cds_wfs_init(&s);

	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)
			write (1, ".", 1);
	}

	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(count_enqueuer);
	free(count_dequeuer);
	free(tid_enqueuer);
	free(tid_dequeuer);
	return 0;
}
Commit	Line	Data
	1	/*
	2	* test_urcu_wfs.c
	3	*
	4	* Userspace RCU library - example RCU-based lock-free stack
	5	*
	6	* Copyright February 2010 - 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	#define _GNU_SOURCE
	25	#include "../config.h"
	26	#include <stdio.h>
	27	#include <pthread.h>
	28	#include <stdlib.h>
	29	#include <stdint.h>
	30	#include <stdbool.h>
	31	#include <string.h>
	32	#include <sys/types.h>
	33	#include <sys/wait.h>
	34	#include <unistd.h>
	35	#include <stdio.h>
	36	#include <assert.h>
	37	#include <sched.h>
	38	#include <errno.h>
	39
	40	#include <urcu/arch.h>
	41	#include <urcu/tls-compat.h>
	42
	43	#ifdef __linux__
	44	#include <syscall.h>
	45	#endif
	46
	47	/* hardcoded number of CPUs */
	48	#define NR_CPUS 16384
	49
	50	#if defined(_syscall0)
	51	_syscall0(pid_t, gettid)
	52	#elif defined(__NR_gettid)
	53	static inline pid_t gettid(void)
	54	{
	55	return syscall(__NR_gettid);
	56	}
	57	#else
	58	#warning "use pid as tid"
	59	static inline pid_t gettid(void)
	60	{
	61	return getpid();
	62	}
	63	#endif
	64
	65	#ifndef DYNAMIC_LINK_TEST
	66	#define _LGPL_SOURCE
	67	#endif
	68	#include <urcu.h>
	69	#include <urcu/wfstack.h>
	70
	71	/*
	72	* External synchronization used.
	73	*/
	74	enum test_sync {
	75	TEST_SYNC_NONE = 0,
	76	TEST_SYNC_MUTEX,
	77	};
	78
	79	static enum test_sync test_sync;
	80
	81	static volatile int test_go, test_stop;
	82
	83	static unsigned long rduration;
	84
	85	static unsigned long duration;
	86
	87	/* read-side C.S. duration, in loops */
	88	static unsigned long wdelay;
	89
	90	static inline void loop_sleep(unsigned long loops)
	91	{
	92	while (loops-- != 0)
	93	caa_cpu_relax();
	94	}
	95
	96	static int verbose_mode;
	97
	98	static int test_pop, test_pop_all;
	99
	100	#define printf_verbose(fmt, args...) \
	101	do { \
	102	if (verbose_mode) \
	103	printf(fmt, ## args); \
	104	} while (0)
	105
	106	static unsigned int cpu_affinities[NR_CPUS];
	107	static unsigned int next_aff = 0;
	108	static int use_affinity = 0;
	109
	110	pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
	111
	112	#ifndef HAVE_CPU_SET_T
	113	typedef unsigned long cpu_set_t;
	114	# define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
	115	# define CPU_SET(cpu, cpuset) do { *(cpuset) \|= (1UL << (cpu)); } while(0)
	116	#endif
	117
	118	static void set_affinity(void)
	119	{
	120	#if HAVE_SCHED_SETAFFINITY
	121	cpu_set_t mask;
	122	int cpu, ret;
	123	#endif /* HAVE_SCHED_SETAFFINITY */
	124
	125	if (!use_affinity)
	126	return;
	127
	128	#if HAVE_SCHED_SETAFFINITY
	129	ret = pthread_mutex_lock(&affinity_mutex);
	130	if (ret) {
	131	perror("Error in pthread mutex lock");
	132	exit(-1);
	133	}
	134	cpu = cpu_affinities[next_aff++];
	135	ret = pthread_mutex_unlock(&affinity_mutex);
	136	if (ret) {
	137	perror("Error in pthread mutex unlock");
	138	exit(-1);
	139	}
	140
	141	CPU_ZERO(&mask);
	142	CPU_SET(cpu, &mask);
	143	#if SCHED_SETAFFINITY_ARGS == 2
	144	sched_setaffinity(0, &mask);
	145	#else
	146	sched_setaffinity(0, sizeof(mask), &mask);
	147	#endif
	148	#endif /* HAVE_SCHED_SETAFFINITY */
	149	}
	150
	151	/*
	152	* returns 0 if test should end.
	153	*/
	154	static int test_duration_dequeue(void)
	155	{
	156	return !test_stop;
	157	}
	158
	159	static int test_duration_enqueue(void)
	160	{
	161	return !test_stop;
	162	}
	163
	164	static DEFINE_URCU_TLS(unsigned long long, nr_dequeues);
	165	static DEFINE_URCU_TLS(unsigned long long, nr_enqueues);
	166
	167	static DEFINE_URCU_TLS(unsigned long long, nr_successful_dequeues);
	168	static DEFINE_URCU_TLS(unsigned long long, nr_successful_enqueues);
	169
	170	static unsigned int nr_enqueuers;
	171	static unsigned int nr_dequeuers;
	172
	173	static struct cds_wfs_stack s;
	174
	175	void thr_enqueuer(void _count)
	176	{
	177	unsigned long long *count = _count;
	178
	179	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
	180	"enqueuer", pthread_self(), (unsigned long)gettid());
	181
	182	set_affinity();
	183
	184	while (!test_go)
	185	{
	186	}
	187	cmm_smp_mb();
	188
	189	for (;;) {
	190	struct cds_wfs_node node = malloc(sizeof(node));
	191	if (!node)
	192	goto fail;
	193	cds_wfs_node_init(node);
	194	cds_wfs_push(&s, node);
	195	URCU_TLS(nr_successful_enqueues)++;
	196
	197	if (caa_unlikely(wdelay))
	198	loop_sleep(wdelay);
	199	fail:
	200	URCU_TLS(nr_enqueues)++;
	201	if (caa_unlikely(!test_duration_enqueue()))
	202	break;
	203	}
	204
	205	count[0] = URCU_TLS(nr_enqueues);
	206	count[1] = URCU_TLS(nr_successful_enqueues);
	207	printf_verbose("enqueuer thread_end, thread id : %lx, tid %lu, "
	208	"enqueues %llu successful_enqueues %llu\n",
	209	pthread_self(), (unsigned long)gettid(),
	210	URCU_TLS(nr_enqueues), URCU_TLS(nr_successful_enqueues));
	211	return ((void*)1);
	212
	213	}
	214
	215	static void do_test_pop(enum test_sync sync)
	216	{
	217	struct cds_wfs_node *node;
	218
	219	if (sync == TEST_SYNC_MUTEX)
	220	cds_wfs_pop_lock(&s);
	221	node = __cds_wfs_pop_blocking(&s);
	222	if (sync == TEST_SYNC_MUTEX)
	223	cds_wfs_pop_unlock(&s);
	224
	225	if (node) {
	226	free(node);
	227	URCU_TLS(nr_successful_dequeues)++;
	228	}
	229	URCU_TLS(nr_dequeues)++;
	230	}
	231
	232	static void do_test_pop_all(enum test_sync sync)
	233	{
	234	struct cds_wfs_head *head;
	235	struct cds_wfs_node node, n;
	236
	237	if (sync == TEST_SYNC_MUTEX)
	238	cds_wfs_pop_lock(&s);
	239	head = __cds_wfs_pop_all(&s);
	240	if (sync == TEST_SYNC_MUTEX)
	241	cds_wfs_pop_unlock(&s);
	242
	243	cds_wfs_for_each_blocking_safe(head, node, n) {
	244	free(node);
	245	URCU_TLS(nr_successful_dequeues)++;
	246	URCU_TLS(nr_dequeues)++;
	247	}
	248	}
	249
	250	void thr_dequeuer(void _count)
	251	{
	252	unsigned long long *count = _count;
	253	unsigned int counter;
	254
	255	printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
	256	"dequeuer", pthread_self(), (unsigned long)gettid());
	257
	258	set_affinity();
	259
	260	while (!test_go)
	261	{
	262	}
	263	cmm_smp_mb();
	264
	265	assert(test_pop \|\| test_pop_all);
	266
	267	for (;;) {
	268	if (test_pop && test_pop_all) {
	269	if (counter & 1)
	270	do_test_pop(test_sync);
	271	else
	272	do_test_pop_all(test_sync);
	273	counter++;
	274	} else {
	275	if (test_pop)
	276	do_test_pop(test_sync);
	277	else
	278	do_test_pop_all(test_sync);
	279	}
	280
	281	if (caa_unlikely(!test_duration_dequeue()))
	282	break;
	283	if (caa_unlikely(rduration))
	284	loop_sleep(rduration);
	285	}
	286
	287	printf_verbose("dequeuer thread_end, thread id : %lx, tid %lu, "
	288	"dequeues %llu, successful_dequeues %llu\n",
	289	pthread_self(), (unsigned long)gettid(),
	290	URCU_TLS(nr_dequeues), URCU_TLS(nr_successful_dequeues));
	291	count[0] = URCU_TLS(nr_dequeues);
	292	count[1] = URCU_TLS(nr_successful_dequeues);
	293	return ((void*)2);
	294	}
	295
	296	void test_end(struct cds_wfs_stack s, unsigned long long nr_dequeues)
	297	{
	298	struct cds_wfs_node *node;
	299
	300	do {
	301	node = cds_wfs_pop_blocking(s);
	302	if (node) {
	303	free(node);
	304	(*nr_dequeues)++;
	305	}
	306	} while (node);
	307	}
	308
	309	void show_usage(int argc, char **argv)
	310	{
	311	printf("Usage : %s nr_dequeuers nr_enqueuers duration (s)", argv[0]);
	312	printf(" [-d delay] (enqueuer period (in loops))");
	313	printf(" [-c duration] (dequeuer period (in loops))");
	314	printf(" [-v] (verbose output)");
	315	printf(" [-a cpu#] [-a cpu#]... (affinity)");
	316	printf(" [-p] (test pop)");
	317	printf(" [-P] (test pop_all, enabled by default)");
	318	printf(" [-M] (use mutex external synchronization)");
	319	printf(" Note: default: no external synchronization used.");
	320	printf("\n");
	321	}
	322
	323	int main(int argc, char **argv)
	324	{
	325	int err;
	326	pthread_t tid_enqueuer, tid_dequeuer;
	327	void *tret;
	328	unsigned long long count_enqueuer, count_dequeuer;
	329	unsigned long long tot_enqueues = 0, tot_dequeues = 0;
	330	unsigned long long tot_successful_enqueues = 0,
	331	tot_successful_dequeues = 0;
	332	unsigned long long end_dequeues = 0;
	333	int i, a;
	334
	335	if (argc < 4) {
	336	show_usage(argc, argv);
	337	return -1;
	338	}
	339
	340	err = sscanf(argv[1], "%u", &nr_dequeuers);
	341	if (err != 1) {
	342	show_usage(argc, argv);
	343	return -1;
	344	}
	345
	346	err = sscanf(argv[2], "%u", &nr_enqueuers);
	347	if (err != 1) {
	348	show_usage(argc, argv);
	349	return -1;
	350	}
	351
	352	err = sscanf(argv[3], "%lu", &duration);
	353	if (err != 1) {
	354	show_usage(argc, argv);
	355	return -1;
	356	}
	357
	358	for (i = 4; i < argc; i++) {
	359	if (argv[i][0] != '-')
	360	continue;
	361	switch (argv[i][1]) {
	362	case 'a':
	363	if (argc < i + 2) {
	364	show_usage(argc, argv);
	365	return -1;
	366	}
	367	a = atoi(argv[++i]);
	368	cpu_affinities[next_aff++] = a;
	369	use_affinity = 1;
	370	printf_verbose("Adding CPU %d affinity\n", a);
	371	break;
	372	case 'c':
	373	if (argc < i + 2) {
	374	show_usage(argc, argv);
	375	return -1;
	376	}
	377	rduration = atol(argv[++i]);
	378	break;
	379	case 'd':
	380	if (argc < i + 2) {
	381	show_usage(argc, argv);
	382	return -1;
	383	}
	384	wdelay = atol(argv[++i]);
	385	break;
	386	case 'v':
	387	verbose_mode = 1;
	388	break;
	389	case 'p':
	390	test_pop = 1;
	391	break;
	392	case 'P':
	393	test_pop_all = 1;
	394	break;
	395	case 'M':
	396	test_sync = TEST_SYNC_MUTEX;
	397	break;
	398	}
	399	}
	400
	401	/* activate pop_all test by default */
	402	if (!test_pop && !test_pop_all)
	403	test_pop_all = 1;
	404
	405	printf_verbose("running test for %lu seconds, %u enqueuers, "
	406	"%u dequeuers.\n",
	407	duration, nr_enqueuers, nr_dequeuers);
	408	if (test_pop)
	409	printf_verbose("pop test activated.\n");
	410	if (test_pop_all)
	411	printf_verbose("pop_all test activated.\n");
	412	printf_verbose("Writer delay : %lu loops.\n", rduration);
	413	printf_verbose("Reader duration : %lu loops.\n", wdelay);
	414	printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
	415	"main", pthread_self(), (unsigned long)gettid());
	416
	417	tid_enqueuer = malloc(sizeof(tid_enqueuer) nr_enqueuers);
	418	tid_dequeuer = malloc(sizeof(tid_dequeuer) nr_dequeuers);
	419	count_enqueuer = malloc(2 * sizeof(count_enqueuer) nr_enqueuers);
	420	count_dequeuer = malloc(2 * sizeof(count_dequeuer) nr_dequeuers);
	421	cds_wfs_init(&s);
	422
	423	next_aff = 0;
	424
	425	for (i = 0; i < nr_enqueuers; i++) {
	426	err = pthread_create(&tid_enqueuer[i], NULL, thr_enqueuer,
	427	&count_enqueuer[2 * i]);
	428	if (err != 0)
	429	exit(1);
	430	}
	431	for (i = 0; i < nr_dequeuers; i++) {
	432	err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer,
	433	&count_dequeuer[2 * i]);
	434	if (err != 0)
	435	exit(1);
	436	}
	437
	438	cmm_smp_mb();
	439
	440	test_go = 1;
	441
	442	for (i = 0; i < duration; i++) {
	443	sleep(1);
	444	if (verbose_mode)
	445	write (1, ".", 1);
	446	}
	447
	448	test_stop = 1;
	449
	450	for (i = 0; i < nr_enqueuers; i++) {
	451	err = pthread_join(tid_enqueuer[i], &tret);
	452	if (err != 0)
	453	exit(1);
	454	tot_enqueues += count_enqueuer[2 * i];
	455	tot_successful_enqueues += count_enqueuer[2 * i + 1];
	456	}
	457	for (i = 0; i < nr_dequeuers; i++) {
	458	err = pthread_join(tid_dequeuer[i], &tret);
	459	if (err != 0)
	460	exit(1);
	461	tot_dequeues += count_dequeuer[2 * i];
	462	tot_successful_dequeues += count_dequeuer[2 * i + 1];
	463	}
	464
	465	test_end(&s, &end_dequeues);
	466
	467	printf_verbose("total number of enqueues : %llu, dequeues %llu\n",
	468	tot_enqueues, tot_dequeues);
	469	printf_verbose("total number of successful enqueues : %llu, "
	470	"successful dequeues %llu\n",
	471	tot_successful_enqueues, tot_successful_dequeues);
	472	printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu "
	473	"nr_dequeuers %3u "
	474	"rdur %6lu nr_enqueues %12llu nr_dequeues %12llu "
	475	"successful enqueues %12llu successful dequeues %12llu "
	476	"end_dequeues %llu nr_ops %12llu\n",
	477	argv[0], duration, nr_enqueuers, wdelay,
	478	nr_dequeuers, rduration, tot_enqueues, tot_dequeues,
	479	tot_successful_enqueues,
	480	tot_successful_dequeues, end_dequeues,
	481	tot_enqueues + tot_dequeues);
	482	if (tot_successful_enqueues != tot_successful_dequeues + end_dequeues)
	483	printf("WARNING! Discrepancy between nr succ. enqueues %llu vs "
	484	"succ. dequeues + end dequeues %llu.\n",
	485	tot_successful_enqueues,
	486	tot_successful_dequeues + end_dequeues);
	487
	488	free(count_enqueuer);
	489	free(count_dequeuer);
	490	free(tid_enqueuer);
	491	free(tid_dequeuer);
	492	return 0;
	493	}