--- /dev/null
+/*
+ * test_urcu_workqueue.c
+ *
+ * Userspace RCU library - workqueue test
+ *
+ * Copyright February 2010-2014 - 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.h>
+#include <urcu/wfstack.h>
+#include <urcu/workqueue-fifo.h>
+
+static volatile int test_go, test_stop_enqueue, test_stop_dequeue;
+
+static unsigned long work_loops;
+
+static unsigned long duration;
+
+static unsigned long dispatch_delay_loops;
+
+static inline void loop_sleep(unsigned long loops)
+{
+ while (loops-- != 0)
+ caa_cpu_relax();
+}
+
+static int verbose_mode;
+
+static int test_wait_empty;
+static int test_enqueue_stopped;
+
+#define printf_verbose(fmt, args...) \
+ do { \
+ if (verbose_mode) \
+ fprintf(stderr, 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 unsigned int nr_dispatchers;
+static unsigned int nr_workers;
+
+static struct urcu_workqueue workqueue;
+
+struct test_work {
+ struct urcu_work w;
+};
+
+static void *thr_dispatcher(void *_count)
+{
+ unsigned long long *count = _count;
+ bool was_nonempty;
+
+ printf_verbose("thread_begin %s, tid %lu\n",
+ "dispatcher", urcu_get_thread_id());
+
+ set_affinity();
+
+ while (!test_go)
+ {
+ }
+ cmm_smp_mb();
+
+ for (;;) {
+ struct test_work *work = malloc(sizeof(*work));
+ if (!work)
+ goto fail;
+ printf_verbose("queue work %p\n", work);
+ urcu_queue_work(&workqueue, &work->w);
+ URCU_TLS(nr_enqueues)++;
+
+ if (caa_unlikely(dispatch_delay_loops))
+ loop_sleep(dispatch_delay_loops);
+fail:
+ if (caa_unlikely(!test_duration_enqueue()))
+ break;
+ }
+
+ uatomic_inc(&test_enqueue_stopped);
+ count[0] = URCU_TLS(nr_enqueues);
+ printf_verbose("dispatcher thread_end, tid %lu, "
+ "enqueues %llu\n",
+ urcu_get_thread_id(),
+ URCU_TLS(nr_enqueues));
+ return ((void*)1);
+}
+
+static void *thr_worker(void *_count)
+{
+ unsigned long long *count = _count;
+ unsigned int counter = 0;
+ struct urcu_worker worker;
+ int blocking = 1;
+
+ printf_verbose("thread_begin %s, tid %lu\n",
+ "worker", urcu_get_thread_id());
+
+ set_affinity();
+
+ rcu_register_thread();
+ urcu_worker_init(&worker, URCU_WORKER_STEAL);
+ //urcu_worker_init(&worker, 0);
+ urcu_worker_register(&workqueue, &worker);
+
+ while (!test_go)
+ {
+ }
+ cmm_smp_mb();
+
+ for (;;) {
+ int batch_work_count = 0;
+
+ urcu_accept_work(&workqueue, &worker, blocking);
+ for (;;) {
+ struct urcu_work *work;
+ struct test_work *t;
+
+ work = urcu_dequeue_work(&worker);
+ if (!work)
+ break;
+ t = caa_container_of(work, struct test_work, w);
+ printf_verbose("dequeue work %p\n", t);
+ batch_work_count++;
+ URCU_TLS(nr_dequeues)++;
+ if (caa_unlikely(work_loops))
+ loop_sleep(work_loops);
+ free(t);
+ }
+ if (!test_duration_dequeue())
+ blocking = 0;
+ if (caa_unlikely(!test_duration_dequeue()
+ && !batch_work_count))
+ break;
+ }
+end:
+ urcu_worker_unregister(&workqueue, &worker);
+ rcu_unregister_thread();
+
+ printf_verbose("worker thread_end, tid %lu, "
+ "dequeues %llu\n",
+ urcu_get_thread_id(),
+ URCU_TLS(nr_dequeues));
+ count[0] = URCU_TLS(nr_dequeues);
+ return ((void*)2);
+}
+
+static void show_usage(int argc, char **argv)
+{
+ printf("Usage : %s nr_workers nr_dispatchers duration (s) <OPTIONS>\n",
+ argv[0]);
+ printf("OPTIONS:\n");
+ printf(" [-d delay] (dispatcher period (in loops))\n");
+ printf(" [-c duration] (worker period (in loops))\n");
+ printf(" [-v] (verbose output)\n");
+ printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
+ printf(" [-w] Wait for worker to empty stack\n");
+ printf("\n");
+}
+
+int main(int argc, char **argv)
+{
+ int err;
+ pthread_t *tid_dispatcher, *tid_worker;
+ void *tret;
+ unsigned long long *count_dispatcher, *count_worker;
+ unsigned long long tot_enqueues = 0, tot_dequeues = 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_workers);
+ if (err != 1) {
+ show_usage(argc, argv);
+ return -1;
+ }
+
+ err = sscanf(argv[2], "%u", &nr_dispatchers);
+ 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;
+ }
+ work_loops = atol(argv[++i]);
+ break;
+ case 'd':
+ if (argc < i + 2) {
+ show_usage(argc, argv);
+ return -1;
+ }
+ dispatch_delay_loops = atol(argv[++i]);
+ break;
+ case 'v':
+ verbose_mode = 1;
+ break;
+ case 'w':
+ test_wait_empty = 1;
+ break;
+ }
+ }
+
+ printf_verbose("running test for %lu seconds, %u dispatchers, "
+ "%u workers.\n",
+ duration, nr_dispatchers, nr_workers);
+ if (test_wait_empty)
+ printf_verbose("Wait for workers to empty workqueue.\n");
+ printf_verbose("Work duration: %lu loops.\n", work_loops);
+ printf_verbose("Dispatcher arrival delay: %lu loops.\n", dispatch_delay_loops);
+ printf_verbose("thread %-6s, tid %lu\n",
+ "main", urcu_get_thread_id());
+
+ tid_dispatcher = calloc(nr_dispatchers, sizeof(*tid_dispatcher));
+ tid_worker = calloc(nr_workers, sizeof(*tid_worker));
+ count_dispatcher = calloc(nr_dispatchers, sizeof(*count_dispatcher));
+ count_worker = calloc(nr_workers, sizeof(*count_worker));
+ urcu_workqueue_init(&workqueue);
+
+ next_aff = 0;
+
+ for (i = 0; i < nr_dispatchers; i++) {
+ err = pthread_create(&tid_dispatcher[i], NULL, thr_dispatcher,
+ &count_dispatcher[i]);
+ if (err != 0)
+ exit(1);
+ }
+ for (i = 0; i < nr_workers; i++) {
+ err = pthread_create(&tid_worker[i], NULL, thr_worker,
+ &count_worker[i]);
+ if (err != 0)
+ exit(1);
+ }
+
+ cmm_smp_mb();
+
+ test_go = 1;
+
+ for (i = 0; i < duration; i++) {
+ sleep(1);
+ if (verbose_mode)
+ (void) write(1, ".", 1);
+ }
+
+ test_stop_enqueue = 1;
+ while (nr_dispatchers != uatomic_read(&test_enqueue_stopped)) {
+ sleep(1);
+ }
+
+ if (test_wait_empty) {
+ while (!cds_wfcq_empty(&workqueue.head, &workqueue.tail)) {
+ sleep(1);
+ }
+ }
+ test_stop_dequeue = 1;
+
+ /* Send finish to all workers */
+ urcu_workqueue_wakeup_all(&workqueue);
+
+ for (i = 0; i < nr_dispatchers; i++) {
+ err = pthread_join(tid_dispatcher[i], &tret);
+ if (err != 0)
+ exit(1);
+ tot_enqueues += count_dispatcher[i];
+ }
+ for (i = 0; i < nr_workers; i++) {
+ err = pthread_join(tid_worker[i], &tret);
+ if (err != 0)
+ exit(1);
+ tot_dequeues += count_worker[i];
+ }
+
+ printf("SUMMARY %-25s testdur %4lu nr_dispatchers %3u dispatch_delay_loops %6lu "
+ "work_loops %lu nr_workers %3u "
+ "nr_enqueues %12llu nr_dequeues %12llu\n",
+ argv[0], duration, nr_dispatchers, dispatch_delay_loops, work_loops,
+ nr_workers, tot_enqueues, tot_dequeues);
+ free(count_dispatcher);
+ free(count_worker);
+ free(tid_dispatcher);
+ free(tid_worker);
+ return retval;
+}
projects / userspace-rcu.git / commitdiff
