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

/*
 * test_urcu_wfcq.c
 *
 * Userspace RCU library - example RCU-based lock-free concurrent queue
 *
 * 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 <errno.h>

#include <urcu/arch.h>
#include <urcu/tls-compat.h>
#include <urcu/uatomic.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/wfcqueue.h>

enum test_sync {
	TEST_SYNC_NONE = 0,
	TEST_SYNC_MUTEX,
};

static enum test_sync test_sync;

static int test_force_sync;

static volatile int test_go, test_stop_enqueue, test_stop_dequeue;

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_dequeue, test_splice, test_wait_empty;
static int test_enqueue_stopped;

#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_dequeue;
}

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

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 DEFINE_URCU_TLS(unsigned long long, nr_empty_dest_enqueues);
static DEFINE_URCU_TLS(unsigned long long, nr_splice);
static DEFINE_URCU_TLS(unsigned long long, nr_dequeue_last);

static unsigned int nr_enqueuers;
static unsigned int nr_dequeuers;

static struct cds_wfcq_head __attribute__((aligned(CAA_CACHE_LINE_SIZE))) head;
static struct cds_wfcq_tail __attribute__((aligned(CAA_CACHE_LINE_SIZE))) tail;

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

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

	set_affinity();

	while (!test_go)
	{
	}
	cmm_smp_mb();

	for (;;) {
		struct cds_wfcq_node *node = malloc(sizeof(*node));
		if (!node)
			goto fail;
		cds_wfcq_node_init(node);
		was_nonempty = cds_wfcq_enqueue(&head, &tail, node);
		URCU_TLS(nr_successful_enqueues)++;
		if (!was_nonempty)
			URCU_TLS(nr_empty_dest_enqueues)++;

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

	uatomic_inc(&test_enqueue_stopped);
	count[0] = URCU_TLS(nr_enqueues);
	count[1] = URCU_TLS(nr_successful_enqueues);
	count[2] = URCU_TLS(nr_empty_dest_enqueues);
	printf_verbose("enqueuer thread_end, tid %lu, "
			"enqueues %llu successful_enqueues %llu, "
			"empty_dest_enqueues %llu\n",
			urcu_get_thread_id(),
			URCU_TLS(nr_enqueues),
			URCU_TLS(nr_successful_enqueues),
			URCU_TLS(nr_empty_dest_enqueues));
	return ((void*)1);

}

static void do_test_dequeue(enum test_sync sync)
{
	struct cds_wfcq_node *node;
	int state;

	if (sync == TEST_SYNC_MUTEX)
		node = cds_wfcq_dequeue_with_state_blocking(&head, &tail,
				&state);
	else
		node = __cds_wfcq_dequeue_with_state_blocking(&head, &tail,
				&state);

	if (state & CDS_WFCQ_STATE_LAST)
		URCU_TLS(nr_dequeue_last)++;

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

static void do_test_splice(enum test_sync sync)
{
	struct cds_wfcq_head tmp_head;
	struct cds_wfcq_tail tmp_tail;
	struct cds_wfcq_node *node, *n;
	enum cds_wfcq_ret ret;

	cds_wfcq_init(&tmp_head, &tmp_tail);

	if (sync == TEST_SYNC_MUTEX)
		ret = cds_wfcq_splice_blocking(&tmp_head, &tmp_tail,
			&head, &tail);
	else
		ret = __cds_wfcq_splice_blocking(&tmp_head, &tmp_tail,
			&head, &tail);

	switch (ret) {
	case CDS_WFCQ_RET_WOULDBLOCK:
		assert(0);	/* blocking call */
		break;
	case CDS_WFCQ_RET_DEST_EMPTY:
		URCU_TLS(nr_splice)++;
		URCU_TLS(nr_dequeue_last)++;
		/* ok */
		break;
	case CDS_WFCQ_RET_DEST_NON_EMPTY:
		assert(0);	/* entirely unexpected */
		break;
	case CDS_WFCQ_RET_SRC_EMPTY:
		/* ok, we could even skip iteration on dest if we wanted */
		break;
	}

	__cds_wfcq_for_each_blocking_safe(&tmp_head, &tmp_tail, node, n) {
		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();

	while (!test_go)
	{
	}
	cmm_smp_mb();

	for (;;) {
		if (test_dequeue && test_splice) {
			if (counter & 1)
				do_test_dequeue(test_sync);
			else
				do_test_splice(test_sync);
			counter++;
		} else {
			if (test_dequeue)
				do_test_dequeue(test_sync);
			else
				do_test_splice(test_sync);
		}
		if (caa_unlikely(!test_duration_dequeue()))
			break;
		if (caa_unlikely(rduration))
			loop_sleep(rduration);
	}

	printf_verbose("dequeuer thread_end, tid %lu, "
			"dequeues %llu, successful_dequeues %llu, "
			"nr_splice %llu\n",
			urcu_get_thread_id(),
			URCU_TLS(nr_dequeues), URCU_TLS(nr_successful_dequeues),
			URCU_TLS(nr_splice));
	count[0] = URCU_TLS(nr_dequeues);
	count[1] = URCU_TLS(nr_successful_dequeues);
	count[2] = URCU_TLS(nr_splice);
	count[3] = URCU_TLS(nr_dequeue_last);
	return ((void*)2);
}

static void test_end(unsigned long long *nr_dequeues,
		unsigned long long *nr_dequeue_last)
{
	struct cds_wfcq_node *node;
	int state;

	do {
		node = cds_wfcq_dequeue_with_state_blocking(&head, &tail,
				&state);
		if (node) {
			if (state & CDS_WFCQ_STATE_LAST)
				(*nr_dequeue_last)++;
			free(node);
			(*nr_dequeues)++;
		}
	} while (node);
}

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("	[-q] (test dequeue)\n");
	printf("	[-s] (test splice, enabled by default)\n");
	printf("	[-M] (use mutex external synchronization)\n");
	printf("		Note: default: no external synchronization used.\n");
	printf("	[-f] (force user-provided synchronization)\n");
	printf("	[-w] Wait for dequeuer to empty queue\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,
			   tot_empty_dest_enqueues = 0,
			   tot_splice = 0, tot_dequeue_last = 0;
	unsigned long long end_dequeues = 0;
	int i, a, retval = 0;

	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 'q':
			test_dequeue = 1;
			break;
		case 's':
			test_splice = 1;
			break;
		case 'M':
			test_sync = TEST_SYNC_MUTEX;
			break;
		case 'w':
			test_wait_empty = 1;
			break;
		case 'f':
			test_force_sync = 1;
			break;
		}
	}

	/* activate splice test by default */
	if (!test_dequeue && !test_splice)
		test_splice = 1;

	if (test_sync == TEST_SYNC_NONE && nr_dequeuers > 1 && test_dequeue) {
		if (test_force_sync) {
			fprintf(stderr, "[WARNING] Using dequeue concurrently "
				"with other dequeue or splice without external "
				"synchronization. Expect run-time failure.\n");
		} else {
			printf("Enforcing mutex synchronization\n");
			test_sync = TEST_SYNC_MUTEX;
		}
	}

	printf_verbose("running test for %lu seconds, %u enqueuers, "
		       "%u dequeuers.\n",
		       duration, nr_enqueuers, nr_dequeuers);
	if (test_dequeue)
		printf_verbose("dequeue test activated.\n");
	else
		printf_verbose("splice test activated.\n");
	if (test_sync == TEST_SYNC_MUTEX)
		printf_verbose("External sync: mutex.\n");
	else
		printf_verbose("External sync: none.\n");
	if (test_wait_empty)
		printf_verbose("Wait for dequeuers to empty queue.\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, 3 * sizeof(*count_enqueuer));
	count_dequeuer = calloc(nr_dequeuers, 4 * sizeof(*count_dequeuer));
	cds_wfcq_init(&head, &tail);

	next_aff = 0;

	for (i = 0; i < nr_enqueuers; i++) {
		err = pthread_create(&tid_enqueuer[i], NULL, thr_enqueuer,
				     &count_enqueuer[3 * i]);
		if (err != 0)
			exit(1);
	}
	for (i = 0; i < nr_dequeuers; i++) {
		err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer,
				     &count_dequeuer[4 * 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_enqueue = 1;

	if (test_wait_empty) {
		while (nr_enqueuers != uatomic_read(&test_enqueue_stopped)) {
			sleep(1);
		}
		while (!cds_wfcq_empty(&head, &tail)) {
			sleep(1);
		}
	}

	test_stop_dequeue = 1;

	for (i = 0; i < nr_enqueuers; i++) {
		err = pthread_join(tid_enqueuer[i], &tret);
		if (err != 0)
			exit(1);
		tot_enqueues += count_enqueuer[3 * i];
		tot_successful_enqueues += count_enqueuer[3 * i + 1];
		tot_empty_dest_enqueues += count_enqueuer[3 * i + 2];
	}
	for (i = 0; i < nr_dequeuers; i++) {
		err = pthread_join(tid_dequeuer[i], &tret);
		if (err != 0)
			exit(1);
		tot_dequeues += count_dequeuer[4 * i];
		tot_successful_dequeues += count_dequeuer[4 * i + 1];
		tot_splice += count_dequeuer[4 * i + 2];
		tot_dequeue_last += count_dequeuer[4 * i + 3];
	}
	
	test_end(&end_dequeues, &tot_dequeue_last);

	printf_verbose("total number of enqueues : %llu, dequeues %llu\n",
		       tot_enqueues, tot_dequeues);
	printf_verbose("total number of successful enqueues : %llu, "
		       "enqueues to empty dest : %llu, "
		       "successful dequeues %llu, "
		       "splice : %llu, dequeue_last : %llu\n",
		       tot_successful_enqueues,
		       tot_empty_dest_enqueues,
		       tot_successful_dequeues,
		       tot_splice, tot_dequeue_last);
	printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu "
		"nr_dequeuers %3u "
		"rdur %6lu nr_enqueues %12llu nr_dequeues %12llu "
		"successful enqueues %12llu enqueues to empty dest %12llu "
		"successful dequeues %12llu splice %12llu "
		"dequeue_last %llu "
		"end_dequeues %llu nr_ops %12llu\n",
		argv[0], duration, nr_enqueuers, wdelay,
		nr_dequeuers, rduration, tot_enqueues, tot_dequeues,
		tot_successful_enqueues,
		tot_empty_dest_enqueues,
		tot_successful_dequeues, tot_splice, tot_dequeue_last,
		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);
		retval = 1;
	}

	/*
	 * If only using splice to dequeue, the enqueuer should see
	 * exactly as many empty queues than the number of non-empty
	 * src splice.
	 */
	if (tot_empty_dest_enqueues != tot_dequeue_last) {
		printf("WARNING! Discrepancy between empty enqueue (%llu) and "
			"number of dequeue of last element (%llu)\n",
			tot_empty_dest_enqueues,
			tot_dequeue_last);
		retval = 1;
	}
	free(count_enqueuer);
	free(count_dequeuer);
	free(tid_enqueuer);
	free(tid_dequeuer);
	return retval;
}
Commit	Line	Data
5e70d572 MD	1	/*
	2	* test_urcu_wfcq.c
	3	*
	4	* Userspace RCU library - example RCU-based lock-free concurrent queue
	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
f5ab766e	25	#include "config.h"
5e70d572 MD	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>
5e70d572 MD	37	#include <errno.h>
	38
	39	#include <urcu/arch.h>
	40	#include <urcu/tls-compat.h>
985c3168	41	#include <urcu/uatomic.h>
2953b501	42	#include "cpuset.h"
94df6318	43	#include "thread-id.h"
5e70d572 MD	44
	45	/* hardcoded number of CPUs */
	46	#define NR_CPUS 16384
	47
5e70d572 MD	48	#ifndef DYNAMIC_LINK_TEST
	49	#define _LGPL_SOURCE
	50	#endif
5e70d572 MD	51	#include <urcu/wfcqueue.h>
5e70d572 MD	52
f5d36fed	53	enum test_sync {
372b9ad7 MD	54	TEST_SYNC_NONE = 0,
372b9ad7 MD	55	TEST_SYNC_MUTEX,
f5d36fed MD	56	};
	57
	58	static enum test_sync test_sync;
	59
372b9ad7 MD	60	static int test_force_sync;
372b9ad7 MD	61
cf9451dc	62	static volatile int test_go, test_stop_enqueue, test_stop_dequeue;
5e70d572 MD	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
ab0aacbe	71	static inline void loop_sleep(unsigned long loops)
5e70d572	72	{
ab0aacbe	73	while (loops-- != 0)
5e70d572 MD	74	caa_cpu_relax();
	75	}
	76
	77	static int verbose_mode;
	78
cf9451dc MD	79	static int test_dequeue, test_splice, test_wait_empty;
cf9451dc MD	80	static int test_enqueue_stopped;
f5d36fed	81
5e70d572 MD	82	#define printf_verbose(fmt, args...) \
	83	do { \
	84	if (verbose_mode) \
f5d36fed	85	printf(fmt, ## args); \
5e70d572 MD	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
5e70d572 MD	94	static void set_affinity(void)
5e70d572 MD	95	{
95bc7fb9	96	#if HAVE_SCHED_SETAFFINITY
5e70d572	97	cpu_set_t mask;
95bc7fb9 MD	98	int cpu, ret;
95bc7fb9 MD	99	#endif /* HAVE_SCHED_SETAFFINITY */
5e70d572 MD	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	{
cf9451dc	132	return !test_stop_dequeue;
5e70d572 MD	133	}
	134
	135	static int test_duration_enqueue(void)
	136	{
cf9451dc	137	return !test_stop_enqueue;
5e70d572 MD	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);
cf9451dc MD	145	static DEFINE_URCU_TLS(unsigned long long, nr_empty_dest_enqueues);
cf9451dc MD	146	static DEFINE_URCU_TLS(unsigned long long, nr_splice);
db182e31	147	static DEFINE_URCU_TLS(unsigned long long, nr_dequeue_last);
5e70d572 MD	148
	149	static unsigned int nr_enqueuers;
	150	static unsigned int nr_dequeuers;
	151
	152	static struct cds_wfcq_head __attribute__((aligned(CAA_CACHE_LINE_SIZE))) head;
	153	static struct cds_wfcq_tail __attribute__((aligned(CAA_CACHE_LINE_SIZE))) tail;
	154
f5d36fed	155	static void thr_enqueuer(void _count)
5e70d572 MD	156	{
5e70d572 MD	157	unsigned long long *count = _count;
cf9451dc	158	bool was_nonempty;
5e70d572	159
94df6318 MD	160	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	161	"enqueuer", urcu_get_thread_id());
5e70d572 MD	162
	163	set_affinity();
	164
	165	while (!test_go)
	166	{
	167	}
	168	cmm_smp_mb();
	169
	170	for (;;) {
	171	struct cds_wfcq_node node = malloc(sizeof(node));
	172	if (!node)
	173	goto fail;
	174	cds_wfcq_node_init(node);
cf9451dc	175	was_nonempty = cds_wfcq_enqueue(&head, &tail, node);
5e70d572	176	URCU_TLS(nr_successful_enqueues)++;
cf9451dc MD	177	if (!was_nonempty)
cf9451dc MD	178	URCU_TLS(nr_empty_dest_enqueues)++;
5e70d572 MD	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
cf9451dc	188	uatomic_inc(&test_enqueue_stopped);
5e70d572 MD	189	count[0] = URCU_TLS(nr_enqueues);
5e70d572 MD	190	count[1] = URCU_TLS(nr_successful_enqueues);
cf9451dc	191	count[2] = URCU_TLS(nr_empty_dest_enqueues);
94df6318 MD	192	printf_verbose("enqueuer thread_end, tid %lu, "
	193	"enqueues %llu successful_enqueues %llu, "
	194	"empty_dest_enqueues %llu\n",
	195	urcu_get_thread_id(),
	196	URCU_TLS(nr_enqueues),
	197	URCU_TLS(nr_successful_enqueues),
	198	URCU_TLS(nr_empty_dest_enqueues));
5e70d572 MD	199	return ((void*)1);
	200
	201	}
	202
f5d36fed MD	203	static void do_test_dequeue(enum test_sync sync)
	204	{
	205	struct cds_wfcq_node *node;
db182e31	206	int state;
f5d36fed MD	207
f5d36fed MD	208	if (sync == TEST_SYNC_MUTEX)
db182e31 MD	209	node = cds_wfcq_dequeue_with_state_blocking(&head, &tail,
db182e31 MD	210	&state);
f5d36fed	211	else
db182e31 MD	212	node = __cds_wfcq_dequeue_with_state_blocking(&head, &tail,
	213	&state);
	214
	215	if (state & CDS_WFCQ_STATE_LAST)
	216	URCU_TLS(nr_dequeue_last)++;
f5d36fed MD	217
	218	if (node) {
	219	free(node);
	220	URCU_TLS(nr_successful_dequeues)++;
	221	}
	222	URCU_TLS(nr_dequeues)++;
	223	}
	224
	225	static void do_test_splice(enum test_sync sync)
	226	{
	227	struct cds_wfcq_head tmp_head;
	228	struct cds_wfcq_tail tmp_tail;
	229	struct cds_wfcq_node node, n;
cf9451dc	230	enum cds_wfcq_ret ret;
f5d36fed MD	231
	232	cds_wfcq_init(&tmp_head, &tmp_tail);
	233
	234	if (sync == TEST_SYNC_MUTEX)
cf9451dc	235	ret = cds_wfcq_splice_blocking(&tmp_head, &tmp_tail,
f5d36fed MD	236	&head, &tail);
f5d36fed MD	237	else
cf9451dc	238	ret = __cds_wfcq_splice_blocking(&tmp_head, &tmp_tail,
f5d36fed MD	239	&head, &tail);
f5d36fed MD	240
cf9451dc MD	241	switch (ret) {
	242	case CDS_WFCQ_RET_WOULDBLOCK:
	243	assert(0); /* blocking call */
	244	break;
	245	case CDS_WFCQ_RET_DEST_EMPTY:
	246	URCU_TLS(nr_splice)++;
db182e31	247	URCU_TLS(nr_dequeue_last)++;
cf9451dc MD	248	/* ok */
	249	break;
	250	case CDS_WFCQ_RET_DEST_NON_EMPTY:
	251	assert(0); /* entirely unexpected */
	252	break;
	253	case CDS_WFCQ_RET_SRC_EMPTY:
	254	/* ok, we could even skip iteration on dest if we wanted */
	255	break;
	256	}
	257
f5d36fed MD	258	__cds_wfcq_for_each_blocking_safe(&tmp_head, &tmp_tail, node, n) {
	259	free(node);
	260	URCU_TLS(nr_successful_dequeues)++;
	261	URCU_TLS(nr_dequeues)++;
	262	}
	263	}
	264
	265	static void thr_dequeuer(void _count)
5e70d572 MD	266	{
5e70d572 MD	267	unsigned long long *count = _count;
f42bc7ef	268	unsigned int counter = 0;
5e70d572	269
94df6318 MD	270	printf_verbose("thread_begin %s, tid %lu\n",
94df6318 MD	271	"dequeuer", urcu_get_thread_id());
5e70d572 MD	272
	273	set_affinity();
	274
	275	while (!test_go)
	276	{
	277	}
	278	cmm_smp_mb();
	279
	280	for (;;) {
f5d36fed MD	281	if (test_dequeue && test_splice) {
	282	if (counter & 1)
	283	do_test_dequeue(test_sync);
	284	else
	285	do_test_splice(test_sync);
	286	counter++;
	287	} else {
	288	if (test_dequeue)
	289	do_test_dequeue(test_sync);
	290	else
	291	do_test_splice(test_sync);
5e70d572	292	}
5e70d572 MD	293	if (caa_unlikely(!test_duration_dequeue()))
	294	break;
	295	if (caa_unlikely(rduration))
	296	loop_sleep(rduration);
	297	}
	298
94df6318 MD	299	printf_verbose("dequeuer thread_end, tid %lu, "
	300	"dequeues %llu, successful_dequeues %llu, "
	301	"nr_splice %llu\n",
	302	urcu_get_thread_id(),
	303	URCU_TLS(nr_dequeues), URCU_TLS(nr_successful_dequeues),
	304	URCU_TLS(nr_splice));
5e70d572 MD	305	count[0] = URCU_TLS(nr_dequeues);
5e70d572 MD	306	count[1] = URCU_TLS(nr_successful_dequeues);
cf9451dc	307	count[2] = URCU_TLS(nr_splice);
db182e31	308	count[3] = URCU_TLS(nr_dequeue_last);
5e70d572 MD	309	return ((void*)2);
	310	}
	311
db182e31 MD	312	static void test_end(unsigned long long *nr_dequeues,
db182e31 MD	313	unsigned long long *nr_dequeue_last)
5e70d572 MD	314	{
5e70d572 MD	315	struct cds_wfcq_node *node;
db182e31	316	int state;
5e70d572 MD	317
5e70d572 MD	318	do {
db182e31 MD	319	node = cds_wfcq_dequeue_with_state_blocking(&head, &tail,
db182e31 MD	320	&state);
5e70d572	321	if (node) {
db182e31 MD	322	if (state & CDS_WFCQ_STATE_LAST)
db182e31 MD	323	(*nr_dequeue_last)++;
5e70d572 MD	324	free(node);
	325	(*nr_dequeues)++;
	326	}
	327	} while (node);
	328	}
	329
f5d36fed	330	static void show_usage(int argc, char **argv)
5e70d572	331	{
06637138 MD	332	printf("Usage : %s nr_dequeuers nr_enqueuers duration (s) <OPTIONS>\n",
	333	argv[0]);
	334	printf("OPTIONS:\n");
	335	printf(" [-d delay] (enqueuer period (in loops))\n");
	336	printf(" [-c duration] (dequeuer period (in loops))\n");
	337	printf(" [-v] (verbose output)\n");
	338	printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
	339	printf(" [-q] (test dequeue)\n");
	340	printf(" [-s] (test splice, enabled by default)\n");
	341	printf(" [-M] (use mutex external synchronization)\n");
	342	printf(" Note: default: no external synchronization used.\n");
	343	printf(" [-f] (force user-provided synchronization)\n");
	344	printf(" [-w] Wait for dequeuer to empty queue\n");
5e70d572 MD	345	printf("\n");
	346	}
	347
	348	int main(int argc, char **argv)
	349	{
	350	int err;
	351	pthread_t tid_enqueuer, tid_dequeuer;
	352	void *tret;
	353	unsigned long long count_enqueuer, count_dequeuer;
	354	unsigned long long tot_enqueues = 0, tot_dequeues = 0;
	355	unsigned long long tot_successful_enqueues = 0,
cf9451dc MD	356	tot_successful_dequeues = 0,
cf9451dc MD	357	tot_empty_dest_enqueues = 0,
db182e31	358	tot_splice = 0, tot_dequeue_last = 0;
5e70d572	359	unsigned long long end_dequeues = 0;
cf9451dc	360	int i, a, retval = 0;
5e70d572 MD	361
	362	if (argc < 4) {
	363	show_usage(argc, argv);
	364	return -1;
	365	}
	366
	367	err = sscanf(argv[1], "%u", &nr_dequeuers);
	368	if (err != 1) {
	369	show_usage(argc, argv);
	370	return -1;
	371	}
	372
	373	err = sscanf(argv[2], "%u", &nr_enqueuers);
	374	if (err != 1) {
	375	show_usage(argc, argv);
	376	return -1;
	377	}
	378
	379	err = sscanf(argv[3], "%lu", &duration);
	380	if (err != 1) {
	381	show_usage(argc, argv);
	382	return -1;
	383	}
	384
	385	for (i = 4; i < argc; i++) {
	386	if (argv[i][0] != '-')
	387	continue;
	388	switch (argv[i][1]) {
	389	case 'a':
	390	if (argc < i + 2) {
	391	show_usage(argc, argv);
	392	return -1;
	393	}
	394	a = atoi(argv[++i]);
	395	cpu_affinities[next_aff++] = a;
	396	use_affinity = 1;
	397	printf_verbose("Adding CPU %d affinity\n", a);
	398	break;
	399	case 'c':
	400	if (argc < i + 2) {
	401	show_usage(argc, argv);
	402	return -1;
	403	}
	404	rduration = atol(argv[++i]);
	405	break;
	406	case 'd':
	407	if (argc < i + 2) {
	408	show_usage(argc, argv);
	409	return -1;
	410	}
	411	wdelay = atol(argv[++i]);
	412	break;
	413	case 'v':
	414	verbose_mode = 1;
	415	break;
f5d36fed MD	416	case 'q':
	417	test_dequeue = 1;
	418	break;
	419	case 's':
	420	test_splice = 1;
	421	break;
	422	case 'M':
	423	test_sync = TEST_SYNC_MUTEX;
	424	break;
cf9451dc MD	425	case 'w':
	426	test_wait_empty = 1;
	427	break;
372b9ad7 MD	428	case 'f':
	429	test_force_sync = 1;
	430	break;
5e70d572 MD	431	}
	432	}
	433
f5d36fed MD	434	/* activate splice test by default */
	435	if (!test_dequeue && !test_splice)
	436	test_splice = 1;
	437
372b9ad7 MD	438	if (test_sync == TEST_SYNC_NONE && nr_dequeuers > 1 && test_dequeue) {
	439	if (test_force_sync) {
	440	fprintf(stderr, "[WARNING] Using dequeue concurrently "
	441	"with other dequeue or splice without external "
	442	"synchronization. Expect run-time failure.\n");
	443	} else {
	444	printf("Enforcing mutex synchronization\n");
	445	test_sync = TEST_SYNC_MUTEX;
	446	}
	447	}
	448
5e70d572 MD	449	printf_verbose("running test for %lu seconds, %u enqueuers, "
	450	"%u dequeuers.\n",
	451	duration, nr_enqueuers, nr_dequeuers);
f5d36fed MD	452	if (test_dequeue)
	453	printf_verbose("dequeue test activated.\n");
	454	else
	455	printf_verbose("splice test activated.\n");
	456	if (test_sync == TEST_SYNC_MUTEX)
	457	printf_verbose("External sync: mutex.\n");
	458	else
	459	printf_verbose("External sync: none.\n");
cf9451dc MD	460	if (test_wait_empty)
cf9451dc MD	461	printf_verbose("Wait for dequeuers to empty queue.\n");
5e70d572 MD	462	printf_verbose("Writer delay : %lu loops.\n", rduration);
5e70d572 MD	463	printf_verbose("Reader duration : %lu loops.\n", wdelay);
94df6318 MD	464	printf_verbose("thread %-6s, tid %lu\n",
94df6318 MD	465	"main", urcu_get_thread_id());
5e70d572	466
9aa14175 MD	467	tid_enqueuer = calloc(nr_enqueuers, sizeof(*tid_enqueuer));
	468	tid_dequeuer = calloc(nr_dequeuers, sizeof(*tid_dequeuer));
	469	count_enqueuer = calloc(nr_enqueuers, 3 * sizeof(*count_enqueuer));
	470	count_dequeuer = calloc(nr_dequeuers, 4 * sizeof(*count_dequeuer));
5e70d572 MD	471	cds_wfcq_init(&head, &tail);
	472
	473	next_aff = 0;
	474
	475	for (i = 0; i < nr_enqueuers; i++) {
	476	err = pthread_create(&tid_enqueuer[i], NULL, thr_enqueuer,
cf9451dc	477	&count_enqueuer[3 * i]);
5e70d572 MD	478	if (err != 0)
	479	exit(1);
	480	}
	481	for (i = 0; i < nr_dequeuers; i++) {
	482	err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer,
db182e31	483	&count_dequeuer[4 * i]);
5e70d572 MD	484	if (err != 0)
	485	exit(1);
	486	}
	487
	488	cmm_smp_mb();
	489
	490	test_go = 1;
	491
	492	for (i = 0; i < duration; i++) {
	493	sleep(1);
	494	if (verbose_mode)
	495	write (1, ".", 1);
	496	}
	497
cf9451dc MD	498	test_stop_enqueue = 1;
	499
	500	if (test_wait_empty) {
	501	while (nr_enqueuers != uatomic_read(&test_enqueue_stopped)) {
	502	sleep(1);
	503	}
	504	while (!cds_wfcq_empty(&head, &tail)) {
	505	sleep(1);
	506	}
	507	}
	508
	509	test_stop_dequeue = 1;
5e70d572 MD	510
	511	for (i = 0; i < nr_enqueuers; i++) {
	512	err = pthread_join(tid_enqueuer[i], &tret);
	513	if (err != 0)
	514	exit(1);
cf9451dc MD	515	tot_enqueues += count_enqueuer[3 * i];
	516	tot_successful_enqueues += count_enqueuer[3 * i + 1];
	517	tot_empty_dest_enqueues += count_enqueuer[3 * i + 2];
5e70d572 MD	518	}
	519	for (i = 0; i < nr_dequeuers; i++) {
	520	err = pthread_join(tid_dequeuer[i], &tret);
	521	if (err != 0)
	522	exit(1);
db182e31 MD	523	tot_dequeues += count_dequeuer[4 * i];
	524	tot_successful_dequeues += count_dequeuer[4 * i + 1];
	525	tot_splice += count_dequeuer[4 * i + 2];
	526	tot_dequeue_last += count_dequeuer[4 * i + 3];
5e70d572 MD	527	}
5e70d572 MD	528
db182e31	529	test_end(&end_dequeues, &tot_dequeue_last);
5e70d572 MD	530
	531	printf_verbose("total number of enqueues : %llu, dequeues %llu\n",
	532	tot_enqueues, tot_dequeues);
	533	printf_verbose("total number of successful enqueues : %llu, "
cf9451dc	534	"enqueues to empty dest : %llu, "
23ae48ef	535	"successful dequeues %llu, "
db182e31	536	"splice : %llu, dequeue_last : %llu\n",
cf9451dc MD	537	tot_successful_enqueues,
	538	tot_empty_dest_enqueues,
	539	tot_successful_dequeues,
db182e31	540	tot_splice, tot_dequeue_last);
5e70d572 MD	541	printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu "
	542	"nr_dequeuers %3u "
	543	"rdur %6lu nr_enqueues %12llu nr_dequeues %12llu "
cf9451dc MD	544	"successful enqueues %12llu enqueues to empty dest %12llu "
cf9451dc MD	545	"successful dequeues %12llu splice %12llu "
db182e31	546	"dequeue_last %llu "
5e70d572 MD	547	"end_dequeues %llu nr_ops %12llu\n",
	548	argv[0], duration, nr_enqueuers, wdelay,
	549	nr_dequeuers, rduration, tot_enqueues, tot_dequeues,
	550	tot_successful_enqueues,
cf9451dc	551	tot_empty_dest_enqueues,
db182e31 MD	552	tot_successful_dequeues, tot_splice, tot_dequeue_last,
db182e31 MD	553	end_dequeues,
5e70d572	554	tot_enqueues + tot_dequeues);
cf9451dc MD	555
cf9451dc MD	556	if (tot_successful_enqueues != tot_successful_dequeues + end_dequeues) {
5e70d572 MD	557	printf("WARNING! Discrepancy between nr succ. enqueues %llu vs "
	558	"succ. dequeues + end dequeues %llu.\n",
	559	tot_successful_enqueues,
	560	tot_successful_dequeues + end_dequeues);
cf9451dc MD	561	retval = 1;
cf9451dc MD	562	}
5e70d572	563
cf9451dc MD	564	/*
	565	* If only using splice to dequeue, the enqueuer should see
	566	* exactly as many empty queues than the number of non-empty
	567	* src splice.
	568	*/
db182e31	569	if (tot_empty_dest_enqueues != tot_dequeue_last) {
cf9451dc	570	printf("WARNING! Discrepancy between empty enqueue (%llu) and "
db182e31	571	"number of dequeue of last element (%llu)\n",
cf9451dc	572	tot_empty_dest_enqueues,
db182e31	573	tot_dequeue_last);
cf9451dc MD	574	retval = 1;
cf9451dc MD	575	}
5e70d572 MD	576	free(count_enqueuer);
	577	free(count_dequeuer);
	578	free(tid_enqueuer);
	579	free(tid_dequeuer);
cf9451dc	580	return retval;
5e70d572	581	}