*
* 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>
#include <stdio.h>
#include <assert.h>
#include <sys/syscall.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)
}
#endif
-#define rdtscll(val) do { \
- unsigned int __a,__d; \
- asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \
- (val) = ((unsigned long long)__a) | (((unsigned long long)__d)<<32); \
-} while(0)
-
-typedef unsigned long long cycles_t;
-
-static inline cycles_t get_cycles (void)
-{
- unsigned long long ret = 0;
-
- rdtscll(ret);
- return ret;
-}
-
+#define _LGPL_SOURCE
#include "urcu.h"
pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
#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 int num_read;
+static int num_write;
-static cycles_t reader_time[NR_READ] __attribute__((aligned(128)));
+#define NR_READ num_read
+#define NR_WRITE num_write
+
+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)
{
"reader", pthread_self(), (unsigned long)gettid());
sleep(2);
- urcu_register_thread();
+ rcu_register_thread();
time1 = get_cycles();
for (i = 0; i < OUTER_READ_LOOP; i++) {
}
time2 = get_cycles();
- urcu_unregister_thread();
+ rcu_unregister_thread();
reader_time[(unsigned long)arg] = time2 - time1;
void *thr_writer(void *arg)
{
- int i;
+ int i, j;
struct test_array *new, *old;
+ 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++) {
- new = malloc(sizeof(struct test_array));
- rcu_copy_mutex_lock();
- old = test_rcu_pointer;
- if (old) {
- assert(old->a == 8);
- }
- new->a = 8;
- old = urcu_publish_content(&test_rcu_pointer, new);
- rcu_copy_mutex_unlock();
- /* can be done after unlock */
- if (old) {
- old->a = 0;
+ for (i = 0; i < OUTER_WRITE_LOOP; i++) {
+ for (j = 0; j < INNER_WRITE_LOOP; j++) {
+ time1 = get_cycles();
+ new = malloc(sizeof(struct test_array));
+ rcu_copy_mutex_lock();
+ old = test_rcu_pointer;
+ if (old) {
+ assert(old->a == 8);
+ }
+ new->a = 8;
+ old = rcu_publish_content(&test_rcu_pointer, new);
+ rcu_copy_mutex_unlock();
+ /* can be done after unlock */
+ if (old) {
+ old->a = 0;
+ }
+ free(old);
+ time2 = get_cycles();
+ writer_time[(unsigned long)arg] += time2 - time1;
+ usleep(1);
}
- free(old);
- usleep(1);
}
printf("thread_end %s, thread id : %lx, tid %lu\n",
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());
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);
}
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];
}
free(test_rcu_pointer);
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;
}
projects / urcu.git / blobdiff