4 * Userspace RCU library - 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>
35 #include <urcu/arch.h>
37 #include "thread-id.h"
45 pthread_rwlock_t lock
= PTHREAD_RWLOCK_INITIALIZER
;
47 static struct test_array test_array
= { 8 };
49 #define OUTER_READ_LOOP 200U
50 #define INNER_READ_LOOP 100000U
51 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
53 #define OUTER_WRITE_LOOP 10U
54 #define INNER_WRITE_LOOP 200U
55 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
60 #define NR_READ num_read
61 #define NR_WRITE num_write
63 static caa_cycles_t
__attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *reader_time
;
64 static caa_cycles_t
__attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *writer_time
;
66 void *thr_reader(void *arg
)
69 caa_cycles_t time1
, time2
;
71 printf("thread_begin %s, tid %lu\n",
72 "reader", urcu_get_thread_id());
75 time1
= caa_get_cycles();
76 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
77 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
78 pthread_rwlock_rdlock(&lock
);
79 assert(test_array
.a
== 8);
80 pthread_rwlock_unlock(&lock
);
83 time2
= caa_get_cycles();
85 reader_time
[(unsigned long)arg
] = time2
- time1
;
88 printf("thread_end %s, tid %lu\n",
89 "reader", urcu_get_thread_id());
94 void *thr_writer(void *arg
)
97 caa_cycles_t time1
, time2
;
99 printf("thread_begin %s, tid %lu\n",
100 "writer", urcu_get_thread_id());
103 for (i
= 0; i
< OUTER_WRITE_LOOP
; i
++) {
104 for (j
= 0; j
< INNER_WRITE_LOOP
; j
++) {
105 time1
= caa_get_cycles();
106 pthread_rwlock_wrlock(&lock
);
108 pthread_rwlock_unlock(&lock
);
109 time2
= caa_get_cycles();
110 writer_time
[(unsigned long)arg
] += time2
- time1
;
115 printf("thread_end %s, tid %lu\n",
116 "writer", urcu_get_thread_id());
120 int main(int argc
, char **argv
)
123 pthread_t
*tid_reader
, *tid_writer
;
126 caa_cycles_t tot_rtime
= 0;
127 caa_cycles_t tot_wtime
= 0;
130 printf("Usage : %s nr_readers nr_writers\n", argv
[0]);
133 num_read
= atoi(argv
[1]);
134 num_write
= atoi(argv
[2]);
136 reader_time
= calloc(num_read
, sizeof(*reader_time
));
137 writer_time
= calloc(num_write
, sizeof(*writer_time
));
138 tid_reader
= calloc(num_read
, sizeof(*tid_reader
));
139 tid_writer
= calloc(num_write
, sizeof(*tid_writer
));
141 printf("thread %-6s, tid %lu\n",
142 "main", urcu_get_thread_id());
144 for (i
= 0; i
< NR_READ
; i
++) {
145 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
150 for (i
= 0; i
< NR_WRITE
; i
++) {
151 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
159 for (i
= 0; i
< NR_READ
; i
++) {
160 err
= pthread_join(tid_reader
[i
], &tret
);
163 tot_rtime
+= reader_time
[i
];
165 for (i
= 0; i
< NR_WRITE
; i
++) {
166 err
= pthread_join(tid_writer
[i
], &tret
);
169 tot_wtime
+= writer_time
[i
];
171 printf("Time per read : %g cycles\n",
172 (double)tot_rtime
/ ((double)NR_READ
* (double)READ_LOOP
));
173 printf("Time per write : %g cycles\n",
174 (double)tot_wtime
/ ((double)NR_WRITE
* (double)WRITE_LOOP
));