4 * Userspace QSBR - test program
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include <sys/types.h>
33 #include <urcu/arch.h>
34 #include <urcu/assert.h>
35 #include "thread-id.h"
38 #include <urcu-qsbr.h>
40 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
43 void rcu_copy_mutex_lock(void)
46 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
48 perror("Error in pthread mutex lock");
54 void rcu_copy_mutex_unlock(void)
58 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
60 perror("Error in pthread mutex unlock");
69 static struct test_array
*test_rcu_pointer
;
71 #define OUTER_READ_LOOP 2000U
72 #define INNER_READ_LOOP 100000U
73 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
75 #define OUTER_WRITE_LOOP 10U
76 #define INNER_WRITE_LOOP 200U
77 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
82 #define NR_READ num_read
83 #define NR_WRITE num_write
85 static caa_cycles_t
__attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *reader_time
;
86 static caa_cycles_t
__attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *writer_time
;
89 void *thr_reader(void *arg
)
92 struct test_array
*local_ptr
;
93 caa_cycles_t time1
, time2
;
95 printf("thread_begin %s, tid %lu\n",
96 "reader", urcu_get_thread_id());
99 rcu_register_thread();
101 time1
= caa_get_cycles();
102 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
103 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
105 local_ptr
= _rcu_dereference(test_rcu_pointer
);
107 urcu_posix_assert(local_ptr
->a
== 8);
111 _rcu_quiescent_state();
113 time2
= caa_get_cycles();
115 rcu_unregister_thread();
117 reader_time
[(unsigned long)arg
] = time2
- time1
;
120 printf("thread_end %s, tid %lu\n",
121 "reader", urcu_get_thread_id());
127 void *thr_writer(void *arg
)
130 struct test_array
*new, *old
;
131 caa_cycles_t time1
, time2
;
133 printf("thread_begin %s, tid %lu\n",
134 "writer", urcu_get_thread_id());
137 for (i
= 0; i
< OUTER_WRITE_LOOP
; i
++) {
138 for (j
= 0; j
< INNER_WRITE_LOOP
; j
++) {
139 time1
= caa_get_cycles();
140 new = malloc(sizeof(struct test_array
));
141 rcu_copy_mutex_lock();
142 old
= test_rcu_pointer
;
144 urcu_posix_assert(old
->a
== 8);
147 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
148 rcu_copy_mutex_unlock();
150 /* can be done after unlock */
155 time2
= caa_get_cycles();
156 writer_time
[(unsigned long)arg
] += time2
- time1
;
161 printf("thread_end %s, tid %lu\n",
162 "writer", urcu_get_thread_id());
166 int main(int argc
, char **argv
)
169 pthread_t
*tid_reader
, *tid_writer
;
172 caa_cycles_t tot_rtime
= 0;
173 caa_cycles_t tot_wtime
= 0;
176 printf("Usage : %s nr_readers nr_writers\n", argv
[0]);
179 num_read
= atoi(argv
[1]);
180 num_write
= atoi(argv
[2]);
182 reader_time
= calloc(num_read
, sizeof(*reader_time
));
183 writer_time
= calloc(num_write
, sizeof(*writer_time
));
184 tid_reader
= calloc(num_read
, sizeof(*tid_reader
));
185 tid_writer
= calloc(num_write
, sizeof(*tid_writer
));
187 printf("thread %-6s, tid %lu\n",
188 "main", urcu_get_thread_id());
190 for (i
= 0; i
< NR_READ
; i
++) {
191 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
196 for (i
= 0; i
< NR_WRITE
; i
++) {
197 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
205 for (i
= 0; i
< NR_READ
; i
++) {
206 err
= pthread_join(tid_reader
[i
], &tret
);
209 tot_rtime
+= reader_time
[i
];
211 for (i
= 0; i
< NR_WRITE
; i
++) {
212 err
= pthread_join(tid_writer
[i
], &tret
);
215 tot_wtime
+= writer_time
[i
];
217 free(test_rcu_pointer
);
218 printf("Time per read : %g cycles\n",
219 (double)tot_rtime
/ ((double)NR_READ
* (double)READ_LOOP
));
220 printf("Time per write : %g cycles\n",
221 (double)tot_wtime
/ ((double)NR_WRITE
* (double)WRITE_LOOP
));