+++ /dev/null
-/*
- * 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 <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/wfstack.h>
-
-/*
- * External synchronization used.
- */
-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_pop, test_pop_all, 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_pop_all);
-static DEFINE_URCU_TLS(unsigned long long, nr_pop_last);
-
-static unsigned int nr_enqueuers;
-static unsigned int nr_dequeuers;
-
-static struct cds_wfs_stack s;
-
-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_wfs_node *node = malloc(sizeof(*node));
- if (!node)
- goto fail;
- cds_wfs_node_init(node);
- was_nonempty = cds_wfs_push(&s, 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_pop(enum test_sync sync)
-{
- struct cds_wfs_node *node;
- int state;
-
- if (sync == TEST_SYNC_MUTEX)
- cds_wfs_pop_lock(&s);
- node = __cds_wfs_pop_with_state_blocking(&s, &state);
- if (sync == TEST_SYNC_MUTEX)
- cds_wfs_pop_unlock(&s);
-
- if (node) {
- if (state & CDS_WFS_STATE_LAST)
- URCU_TLS(nr_pop_last)++;
- 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);
-
- /* Check if empty */
- if (cds_wfs_first(head) == NULL)
- return;
-
- URCU_TLS(nr_pop_all)++;
- URCU_TLS(nr_pop_last)++;
-
- cds_wfs_for_each_blocking_safe(head, 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();
-
- 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, tid %lu, "
- "dequeues %llu, successful_dequeues %llu "
- "pop_all %llu pop_last %llu\n",
- urcu_get_thread_id(),
- URCU_TLS(nr_dequeues), URCU_TLS(nr_successful_dequeues),
- URCU_TLS(nr_pop_all),
- URCU_TLS(nr_pop_last));
- count[0] = URCU_TLS(nr_dequeues);
- count[1] = URCU_TLS(nr_successful_dequeues);
- count[2] = URCU_TLS(nr_pop_all);
- count[3] = URCU_TLS(nr_pop_last);
- return ((void*)2);
-}
-
-static void test_end(struct cds_wfs_stack *s, unsigned long long *nr_dequeues,
- unsigned long long *nr_pop_last)
-{
- struct cds_wfs_node *node;
- int state;
-
- do {
- node = cds_wfs_pop_with_state_blocking(s, &state);
- if (node) {
- if (state & CDS_WFS_STATE_LAST)
- (*nr_pop_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(" [-p] (test pop)\n");
- printf(" [-P] (test pop_all, 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 stack\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_pop_all = 0, tot_pop_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 'p':
- test_pop = 1;
- break;
- case 'P':
- test_pop_all = 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 pop_all test by default */
- if (!test_pop && !test_pop_all)
- test_pop_all = 1;
-
- if (test_sync == TEST_SYNC_NONE && nr_dequeuers > 1 && test_pop) {
- if (test_force_sync) {
- fprintf(stderr, "[WARNING] Using pop concurrently "
- "with other pop or pop_all 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_pop)
- printf_verbose("pop test activated.\n");
- if (test_pop_all)
- printf_verbose("pop_all 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 stack.\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_wfs_init(&s);
-
- 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_wfs_empty(&s)) {
- 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_pop_all += count_dequeuer[4 * i + 2];
- tot_pop_last += count_dequeuer[4 * i + 3];
- }
-
- test_end(&s, &end_dequeues, &tot_pop_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, "
- "pop_all : %llu, pop_last : %llu\n",
- tot_successful_enqueues,
- tot_empty_dest_enqueues,
- tot_successful_dequeues,
- tot_pop_all, tot_pop_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 pop_all %12llu "
- "pop_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_pop_all, tot_pop_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;
- }
- /*
- * The enqueuer should see exactly as many empty queues than the
- * number of non-empty stacks dequeued.
- */
- if (tot_empty_dest_enqueues != tot_pop_last) {
- printf("WARNING! Discrepancy between empty enqueue (%llu) and "
- "number of pop last (%llu)\n",
- tot_empty_dest_enqueues,
- tot_pop_last);
- retval = 1;
- }
- free(count_enqueuer);
- free(count_dequeuer);
- free(tid_enqueuer);
- free(tid_dequeuer);
- return retval;
-}
projects / urcu.git / blobdiff