Add QSBR RCU timing tests

[urcu.git] / test_rwlock_timing.c

diff --git a/test_rwlock_timing.c b/test_rwlock_timing.c
index 9ea2494e7804f6e7cd4f402f2542b91a5b125f74..3f0b0c9a51f56ee422ce7f66509f2505b51e5c54 100644 (file)
--- a/test_rwlock_timing.c
+++ b/test_rwlock_timing.c
@@ -5,7 +5,19 @@
  *
  * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
  *
- * Distributed under GPLv2
+ * 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.
  */
 
 #include <stdio.h>
@@ -19,6 +31,7 @@
 #include <assert.h>
 #include <sys/syscall.h>
 #include <pthread.h>
+#include <arch.h>
 
 #if defined(_syscall0)
 _syscall0(pid_t, gettid)
@@ -49,12 +62,15 @@ static struct test_array test_array = { 8 };
 #define INNER_READ_LOOP        100000U
 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
 
-#define WRITE_LOOP 2000U
+#define OUTER_WRITE_LOOP 10U
+#define INNER_WRITE_LOOP 200U
+#define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
 
 #define NR_READ 10
 #define NR_WRITE 9
 
 static cycles_t reader_time[NR_READ] __attribute__((aligned(128)));
+static cycles_t writer_time[NR_WRITE] __attribute__((aligned(128)));
 
 void *thr_reader(void *arg)
 {
@@ -86,17 +102,23 @@ void *thr_reader(void *arg)
 
 void *thr_writer(void *arg)
 {
-       int i;
+       int i, j;
+       cycles_t time1, time2;
 
        printf("thread_begin %s, thread id : %lx, tid %lu\n",
                        "writer", pthread_self(), (unsigned long)gettid());
        sleep(2);
 
-       for (i = 0; i < WRITE_LOOP; i++) {
-               pthread_rwlock_wrlock(&lock);
-               test_array.a = 8;
-               pthread_rwlock_unlock(&lock);
-               usleep(1);
+       for (i = 0; i < OUTER_WRITE_LOOP; i++) {
+               for (j = 0; j < INNER_WRITE_LOOP; j++) {
+                       time1 = get_cycles();
+                       pthread_rwlock_wrlock(&lock);
+                       test_array.a = 8;
+                       pthread_rwlock_unlock(&lock);
+                       time2 = get_cycles();
+                       writer_time[(unsigned long)arg] += time2 - time1;
+                       usleep(1);
+               }
        }
 
        printf("thread_end %s, thread id : %lx, tid %lu\n",
@@ -110,7 +132,8 @@ int main()
        pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE];
        void *tret;
        int i;
-       cycles_t tot_time = 0;
+       cycles_t tot_rtime = 0;
+       cycles_t tot_wtime = 0;
 
        printf("thread %-6s, thread id : %lx, tid %lu\n",
                        "main", pthread_self(), (unsigned long)gettid());
@@ -122,7 +145,8 @@ int main()
                        exit(1);
        }
        for (i = 0; i < NR_WRITE; i++) {
-               err = pthread_create(&tid_writer[i], NULL, thr_writer, NULL);
+               err = pthread_create(&tid_writer[i], NULL, thr_writer,
+                                    (void *)(long)i);
                if (err != 0)
                        exit(1);
        }
@@ -133,15 +157,18 @@ int main()
                err = pthread_join(tid_reader[i], &tret);
                if (err != 0)
                        exit(1);
-               tot_time += reader_time[i];
+               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_time / ((double)NR_READ * (double)READ_LOOP));
+              (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));
 
        return 0;
 }