Fix typo in license file

[urcu.git] / test_rwlock_timing.c

diff --git a/test_rwlock_timing.c b/test_rwlock_timing.c
index 2c3d8944e9962ae7b4a3051ec3ff512cc6886943..4884e4dc2a4840ad7db45311684d87f673a32e02 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>
@@ -21,6 +33,9 @@
 #include <pthread.h>
 #include <arch.h>
 
+/* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
+#define CACHE_LINE_SIZE 4096
+
 #if defined(_syscall0)
 _syscall0(pid_t, gettid)
 #elif defined(__NR_gettid)
@@ -50,12 +65,18 @@ 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)
+
+static int num_read;
+static int num_write;
 
-#define NR_READ 10
-#define NR_WRITE 9
+#define NR_READ num_read
+#define NR_WRITE num_write
 
-static cycles_t reader_time[NR_READ] __attribute__((aligned(128)));
+static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time;
+static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time;
 
 void *thr_reader(void *arg)
 {
@@ -87,17 +108,23 @@ 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",
@@ -105,13 +132,26 @@ void *thr_writer(void *arg)
        return ((void*)2);
 }
 
-int main()
+int main(int argc, char **argv)
 {
        int err;
-       pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE];
+       pthread_t *tid_reader, *tid_writer;
        void *tret;
        int i;
-       cycles_t tot_time = 0;
+       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 = malloc(sizeof(*reader_time) * num_read);
+       writer_time = malloc(sizeof(*writer_time) * num_write);
+       tid_reader = malloc(sizeof(*tid_reader) * num_read);
+       tid_writer = malloc(sizeof(*tid_writer) * num_write);
 
        printf("thread %-6s, thread id : %lx, tid %lu\n",
                        "main", pthread_self(), (unsigned long)gettid());
@@ -123,7 +163,8 @@ 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);
        }
@@ -134,15 +175,23 @@ 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));
+
+       free(reader_time);
+       free(writer_time);
+       free(tid_reader);
+       free(tid_writer);
 
        return 0;
 }