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>
42 #if defined(_syscall0)
43 _syscall0(pid_t
, gettid
)
44 #elif defined(__NR_gettid)
45 static inline pid_t
gettid(void)
47 return syscall(__NR_gettid
);
50 #warning "use pid as tid"
51 static inline pid_t
gettid(void)
63 pthread_rwlock_t lock
= PTHREAD_RWLOCK_INITIALIZER
;
65 static struct test_array test_array
= { 8 };
67 #define OUTER_READ_LOOP 200U
68 #define INNER_READ_LOOP 100000U
69 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
71 #define OUTER_WRITE_LOOP 10U
72 #define INNER_WRITE_LOOP 200U
73 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
78 #define NR_READ num_read
79 #define NR_WRITE num_write
81 static cycles_t
__attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *reader_time
;
82 static cycles_t
__attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *writer_time
;
84 void *thr_reader(void *arg
)
87 cycles_t time1
, time2
;
89 printf("thread_begin %s, thread id : %lx, tid %lu\n",
90 "reader", pthread_self(), (unsigned long)gettid());
93 time1
= caa_get_cycles();
94 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
95 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
96 pthread_rwlock_rdlock(&lock
);
97 assert(test_array
.a
== 8);
98 pthread_rwlock_unlock(&lock
);
101 time2
= caa_get_cycles();
103 reader_time
[(unsigned long)arg
] = time2
- time1
;
106 printf("thread_end %s, thread id : %lx, tid %lu\n",
107 "reader", pthread_self(), (unsigned long)gettid());
112 void *thr_writer(void *arg
)
115 cycles_t time1
, time2
;
117 printf("thread_begin %s, thread id : %lx, tid %lu\n",
118 "writer", pthread_self(), (unsigned long)gettid());
121 for (i
= 0; i
< OUTER_WRITE_LOOP
; i
++) {
122 for (j
= 0; j
< INNER_WRITE_LOOP
; j
++) {
123 time1
= caa_get_cycles();
124 pthread_rwlock_wrlock(&lock
);
126 pthread_rwlock_unlock(&lock
);
127 time2
= caa_get_cycles();
128 writer_time
[(unsigned long)arg
] += time2
- time1
;
133 printf("thread_end %s, thread id : %lx, tid %lu\n",
134 "writer", pthread_self(), (unsigned long)gettid());
138 int main(int argc
, char **argv
)
141 pthread_t
*tid_reader
, *tid_writer
;
144 cycles_t tot_rtime
= 0;
145 cycles_t tot_wtime
= 0;
148 printf("Usage : %s nr_readers nr_writers\n", argv
[0]);
151 num_read
= atoi(argv
[1]);
152 num_write
= atoi(argv
[2]);
154 reader_time
= malloc(sizeof(*reader_time
) * num_read
);
155 writer_time
= malloc(sizeof(*writer_time
) * num_write
);
156 tid_reader
= malloc(sizeof(*tid_reader
) * num_read
);
157 tid_writer
= malloc(sizeof(*tid_writer
) * num_write
);
159 printf("thread %-6s, thread id : %lx, tid %lu\n",
160 "main", pthread_self(), (unsigned long)gettid());
162 for (i
= 0; i
< NR_READ
; i
++) {
163 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
168 for (i
= 0; i
< NR_WRITE
; i
++) {
169 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
177 for (i
= 0; i
< NR_READ
; i
++) {
178 err
= pthread_join(tid_reader
[i
], &tret
);
181 tot_rtime
+= reader_time
[i
];
183 for (i
= 0; i
< NR_WRITE
; i
++) {
184 err
= pthread_join(tid_writer
[i
], &tret
);
187 tot_wtime
+= writer_time
[i
];
189 printf("Time per read : %g cycles\n",
190 (double)tot_rtime
/ ((double)NR_READ
* (double)READ_LOOP
));
191 printf("Time per write : %g cycles\n",
192 (double)tot_wtime
/ ((double)NR_WRITE
* (double)WRITE_LOOP
));