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.
28 #include <sys/types.h>
36 #include <urcu/arch.h>
38 #include "thread-id.h"
46 pthread_rwlock_t lock
= PTHREAD_RWLOCK_INITIALIZER
;
48 static struct test_array test_array
= { 8 };
50 #define OUTER_READ_LOOP 200U
51 #define INNER_READ_LOOP 100000U
52 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
54 #define OUTER_WRITE_LOOP 10U
55 #define INNER_WRITE_LOOP 200U
56 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
61 #define NR_READ num_read
62 #define NR_WRITE num_write
64 static cycles_t
__attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *reader_time
;
65 static cycles_t
__attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *writer_time
;
67 void *thr_reader(void *arg
)
70 cycles_t time1
, time2
;
72 printf("thread_begin %s, tid %lu\n",
73 "reader", urcu_get_thread_id());
76 time1
= caa_get_cycles();
77 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
78 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
79 pthread_rwlock_rdlock(&lock
);
80 assert(test_array
.a
== 8);
81 pthread_rwlock_unlock(&lock
);
84 time2
= caa_get_cycles();
86 reader_time
[(unsigned long)arg
] = time2
- time1
;
89 printf("thread_end %s, tid %lu\n",
90 "reader", urcu_get_thread_id());
95 void *thr_writer(void *arg
)
98 cycles_t time1
, time2
;
100 printf("thread_begin %s, tid %lu\n",
101 "writer", urcu_get_thread_id());
104 for (i
= 0; i
< OUTER_WRITE_LOOP
; i
++) {
105 for (j
= 0; j
< INNER_WRITE_LOOP
; j
++) {
106 time1
= caa_get_cycles();
107 pthread_rwlock_wrlock(&lock
);
109 pthread_rwlock_unlock(&lock
);
110 time2
= caa_get_cycles();
111 writer_time
[(unsigned long)arg
] += time2
- time1
;
116 printf("thread_end %s, tid %lu\n",
117 "writer", urcu_get_thread_id());
121 int main(int argc
, char **argv
)
124 pthread_t
*tid_reader
, *tid_writer
;
127 cycles_t tot_rtime
= 0;
128 cycles_t tot_wtime
= 0;
131 printf("Usage : %s nr_readers nr_writers\n", argv
[0]);
134 num_read
= atoi(argv
[1]);
135 num_write
= atoi(argv
[2]);
137 reader_time
= calloc(num_read
, sizeof(*reader_time
));
138 writer_time
= calloc(num_write
, sizeof(*writer_time
));
139 tid_reader
= calloc(num_read
, sizeof(*tid_reader
));
140 tid_writer
= calloc(num_write
, sizeof(*tid_writer
));
142 printf("thread %-6s, tid %lu\n",
143 "main", urcu_get_thread_id());
145 for (i
= 0; i
< NR_READ
; i
++) {
146 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
151 for (i
= 0; i
< NR_WRITE
; i
++) {
152 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
160 for (i
= 0; i
< NR_READ
; i
++) {
161 err
= pthread_join(tid_reader
[i
], &tret
);
164 tot_rtime
+= reader_time
[i
];
166 for (i
= 0; i
< NR_WRITE
; i
++) {
167 err
= pthread_join(tid_writer
[i
], &tret
);
170 tot_wtime
+= writer_time
[i
];
172 printf("Time per read : %g cycles\n",
173 (double)tot_rtime
/ ((double)NR_READ
* (double)READ_LOOP
));
174 printf("Time per write : %g cycles\n",
175 (double)tot_wtime
/ ((double)NR_WRITE
* (double)WRITE_LOOP
));