2 * test_perthreadloc_timing.c
4 * Per thread locks - 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 static struct test_array test_array
= { 8 };
47 struct per_thread_lock
{
49 } __attribute__((aligned(CAA_CACHE_LINE_SIZE
))); /* cache-line aligned */
51 static struct per_thread_lock
*per_thread_lock
;
53 #define OUTER_READ_LOOP 200U
54 #define INNER_READ_LOOP 100000U
55 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
57 #define OUTER_WRITE_LOOP 10U
58 #define INNER_WRITE_LOOP 200U
59 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
64 #define NR_READ num_read
65 #define NR_WRITE num_write
67 static caa_cycles_t
__attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *reader_time
;
68 static caa_cycles_t
__attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *writer_time
;
70 void *thr_reader(void *arg
)
73 caa_cycles_t time1
, time2
;
74 long tidx
= (long)arg
;
76 printf("thread_begin %s, tid %lu\n",
77 "reader", urcu_get_thread_id());
80 time1
= caa_get_cycles();
81 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
82 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
83 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
84 assert(test_array
.a
== 8);
85 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
88 time2
= caa_get_cycles();
90 reader_time
[tidx
] = time2
- time1
;
93 printf("thread_end %s, tid %lu\n",
94 "reader", urcu_get_thread_id());
99 void *thr_writer(void *arg
)
103 caa_cycles_t time1
, time2
;
105 printf("thread_begin %s, tid %lu\n",
106 "writer", urcu_get_thread_id());
109 for (i
= 0; i
< OUTER_WRITE_LOOP
; i
++) {
110 for (j
= 0; j
< INNER_WRITE_LOOP
; j
++) {
111 time1
= caa_get_cycles();
112 for (tidx
= 0; tidx
< NR_READ
; tidx
++) {
113 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
116 for (tidx
= NR_READ
- 1; tidx
>= 0; tidx
--) {
117 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
119 time2
= caa_get_cycles();
120 writer_time
[(unsigned long)arg
] += time2
- time1
;
125 printf("thread_end %s, tid %lu\n",
126 "writer", urcu_get_thread_id());
130 int main(int argc
, char **argv
)
133 pthread_t
*tid_reader
, *tid_writer
;
136 caa_cycles_t tot_rtime
= 0;
137 caa_cycles_t tot_wtime
= 0;
140 printf("Usage : %s nr_readers nr_writers\n", argv
[0]);
143 num_read
= atoi(argv
[1]);
144 num_write
= atoi(argv
[2]);
146 reader_time
= calloc(num_read
, sizeof(*reader_time
));
147 writer_time
= calloc(num_write
, sizeof(*writer_time
));
148 tid_reader
= calloc(num_read
, sizeof(*tid_reader
));
149 tid_writer
= calloc(num_write
, sizeof(*tid_writer
));
151 printf("thread %-6s, tid %lu\n",
152 "main", urcu_get_thread_id());
154 per_thread_lock
= malloc(sizeof(struct per_thread_lock
) * NR_READ
);
156 for (i
= 0; i
< NR_READ
; i
++) {
157 pthread_mutex_init(&per_thread_lock
[i
].lock
, NULL
);
159 for (i
= 0; i
< NR_READ
; i
++) {
160 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
165 for (i
= 0; i
< NR_WRITE
; i
++) {
166 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
174 for (i
= 0; i
< NR_READ
; i
++) {
175 err
= pthread_join(tid_reader
[i
], &tret
);
178 tot_rtime
+= reader_time
[i
];
180 for (i
= 0; i
< NR_WRITE
; i
++) {
181 err
= pthread_join(tid_writer
[i
], &tret
);
184 tot_wtime
+= writer_time
[i
];
186 printf("Time per read : %g cycles\n",
187 (double)tot_rtime
/ ((double)NR_READ
* (double)READ_LOOP
));
188 printf("Time per write : %g cycles\n",
189 (double)tot_wtime
/ ((double)NR_WRITE
* (double)WRITE_LOOP
));
190 free(per_thread_lock
);
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