X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;ds=sidebyside;f=tests%2Fbenchmark%2Ftest_rwlock_timing.c;fp=tests%2Fbenchmark%2Ftest_rwlock_timing.c;h=d916071f61b459f9ea4f8ea24ec74445cd2b6e9c;hb=f5ab766ee2c8300cb00ca5878b1cb464f960a66d;hp=0000000000000000000000000000000000000000;hpb=a5bae03d59c22e57263b8610b9fed99738303cf0;p=urcu.git

diff --git a/tests/benchmark/test_rwlock_timing.c b/tests/benchmark/test_rwlock_timing.c
new file mode 100644
index 0000000..d916071
--- /dev/null
+++ b/tests/benchmark/test_rwlock_timing.c
@@ -0,0 +1,183 @@
+/*
+ * test_urcu.c
+ *
+ * Userspace RCU library - test program
+ *
+ * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.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 <stdio.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <assert.h>
+#include <pthread.h>
+#include <errno.h>
+
+#include <urcu/arch.h>
+
+#include "thread-id.h"
+
+#include <urcu.h>
+
+struct test_array {
+	int a;
+};
+
+pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
+
+static struct test_array test_array = { 8 };
+
+#define OUTER_READ_LOOP	200U
+#define INNER_READ_LOOP	100000U
+#define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
+
+#define OUTER_WRITE_LOOP 10U
+#define INNER_WRITE_LOOP 200U
+#define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
+
+static int num_read;
+static int num_write;
+
+#define NR_READ num_read
+#define NR_WRITE num_write
+
+static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time;
+static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time;
+
+void *thr_reader(void *arg)
+{
+	int i, j;
+	cycles_t time1, time2;
+
+	printf("thread_begin %s, tid %lu\n",
+		"reader", urcu_get_thread_id());
+	sleep(2);
+
+	time1 = caa_get_cycles();
+	for (i = 0; i < OUTER_READ_LOOP; i++) {
+		for (j = 0; j < INNER_READ_LOOP; j++) {
+			pthread_rwlock_rdlock(&lock);
+			assert(test_array.a == 8);
+			pthread_rwlock_unlock(&lock);
+		}
+	}
+	time2 = caa_get_cycles();
+
+	reader_time[(unsigned long)arg] = time2 - time1;
+
+	sleep(2);
+	printf("thread_end %s, tid %lu\n",
+		"reader", urcu_get_thread_id());
+	return ((void*)1);
+
+}
+
+void *thr_writer(void *arg)
+{
+	int i, j;
+	cycles_t time1, time2;
+
+	printf("thread_begin %s, tid %lu\n",
+		"writer", urcu_get_thread_id());
+	sleep(2);
+
+	for (i = 0; i < OUTER_WRITE_LOOP; i++) {
+		for (j = 0; j < INNER_WRITE_LOOP; j++) {
+			time1 = caa_get_cycles();
+			pthread_rwlock_wrlock(&lock);
+			test_array.a = 8;
+			pthread_rwlock_unlock(&lock);
+			time2 = caa_get_cycles();
+			writer_time[(unsigned long)arg] += time2 - time1;
+			usleep(1);
+		}
+	}
+
+	printf("thread_end %s, tid %lu\n",
+		"writer", urcu_get_thread_id());
+	return ((void*)2);
+}
+
+int main(int argc, char **argv)
+{
+	int err;
+	pthread_t *tid_reader, *tid_writer;
+	void *tret;
+	int i;
+	cycles_t tot_rtime = 0;
+	cycles_t tot_wtime = 0;
+
+	if (argc < 2) {
+		printf("Usage : %s nr_readers nr_writers\n", argv[0]);
+		exit(-1);
+	}
+	num_read = atoi(argv[1]);
+	num_write = atoi(argv[2]);
+
+	reader_time = calloc(num_read, sizeof(*reader_time));
+	writer_time = calloc(num_write, sizeof(*writer_time));
+	tid_reader = calloc(num_read, sizeof(*tid_reader));
+	tid_writer = calloc(num_write, sizeof(*tid_writer));
+
+	printf("thread %-6s, tid %lu\n",
+		"main", urcu_get_thread_id());
+
+	for (i = 0; i < NR_READ; i++) {
+		err = pthread_create(&tid_reader[i], NULL, thr_reader,
+				     (void *)(long)i);
+		if (err != 0)
+			exit(1);
+	}
+	for (i = 0; i < NR_WRITE; i++) {
+		err = pthread_create(&tid_writer[i], NULL, thr_writer,
+				     (void *)(long)i);
+		if (err != 0)
+			exit(1);
+	}
+
+	sleep(10);
+
+	for (i = 0; i < NR_READ; i++) {
+		err = pthread_join(tid_reader[i], &tret);
+		if (err != 0)
+			exit(1);
+		tot_rtime += reader_time[i];
+	}
+	for (i = 0; i < NR_WRITE; i++) {
+		err = pthread_join(tid_writer[i], &tret);
+		if (err != 0)
+			exit(1);
+		tot_wtime += writer_time[i];
+	}
+	printf("Time per read : %g cycles\n",
+	       (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
+	printf("Time per write : %g cycles\n",
+	       (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
+
+	free(reader_time);
+	free(writer_time);
+	free(tid_reader);
+	free(tid_writer);
+
+	return 0;
+}