2 * test_perthreadloc_timing.c
4 * Per thread locks - test program
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
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>
32 #include <sys/syscall.h>
36 #if defined(_syscall0)
37 _syscall0(pid_t
, gettid
)
38 #elif defined(__NR_gettid)
39 static inline pid_t
gettid(void)
41 return syscall(__NR_gettid
);
44 #warning "use pid as tid"
45 static inline pid_t
gettid(void)
57 static struct test_array test_array
= { 8 };
59 struct per_thread_lock
{
61 } __attribute__((aligned(128))); /* cache-line aligned */
63 static struct per_thread_lock
*per_thread_lock
;
65 #define OUTER_READ_LOOP 200U
66 #define INNER_READ_LOOP 100000U
67 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
69 #define OUTER_WRITE_LOOP 10U
70 #define INNER_WRITE_LOOP 200U
71 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
76 #define NR_READ num_read
77 #define NR_WRITE num_write
79 static cycles_t
__attribute__((aligned(128))) *reader_time
;
80 static cycles_t
__attribute__((aligned(128))) *writer_time
;
82 void *thr_reader(void *arg
)
85 cycles_t time1
, time2
;
86 long tidx
= (long)arg
;
88 printf("thread_begin %s, thread id : %lx, tid %lu\n",
89 "reader", pthread_self(), (unsigned long)gettid());
93 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
94 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
95 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
96 assert(test_array
.a
== 8);
97 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
100 time2
= get_cycles();
102 reader_time
[tidx
] = time2
- time1
;
105 printf("thread_end %s, thread id : %lx, tid %lu\n",
106 "reader", pthread_self(), (unsigned long)gettid());
111 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
= get_cycles();
124 for (tidx
= 0; tidx
< NR_READ
; tidx
++) {
125 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
128 for (tidx
= NR_READ
- 1; tidx
>= 0; tidx
--) {
129 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
131 time2
= get_cycles();
132 writer_time
[(unsigned long)arg
] += time2
- time1
;
137 printf("thread_end %s, thread id : %lx, tid %lu\n",
138 "writer", pthread_self(), (unsigned long)gettid());
142 int main(int argc
, char **argv
)
145 pthread_t
*tid_reader
, *tid_writer
;
148 cycles_t tot_rtime
= 0;
149 cycles_t tot_wtime
= 0;
152 printf("Usage : %s nr_readers nr_writers\n", argv
[0]);
155 num_read
= atoi(argv
[1]);
156 num_write
= atoi(argv
[2]);
158 reader_time
= malloc(sizeof(*reader_time
) * num_read
);
159 writer_time
= malloc(sizeof(*writer_time
) * num_write
);
160 tid_reader
= malloc(sizeof(*tid_reader
) * num_read
);
161 tid_writer
= malloc(sizeof(*tid_writer
) * num_write
);
163 printf("thread %-6s, thread id : %lx, tid %lu\n",
164 "main", pthread_self(), (unsigned long)gettid());
166 per_thread_lock
= malloc(sizeof(struct per_thread_lock
) * NR_READ
);
168 for (i
= 0; i
< NR_READ
; i
++) {
169 pthread_mutex_init(&per_thread_lock
[i
].lock
, NULL
);
171 for (i
= 0; i
< NR_READ
; i
++) {
172 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
177 for (i
= 0; i
< NR_WRITE
; i
++) {
178 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
186 for (i
= 0; i
< NR_READ
; i
++) {
187 err
= pthread_join(tid_reader
[i
], &tret
);
190 tot_rtime
+= reader_time
[i
];
192 for (i
= 0; i
< NR_WRITE
; i
++) {
193 err
= pthread_join(tid_writer
[i
], &tret
);
196 tot_wtime
+= writer_time
[i
];
198 printf("Time per read : %g cycles\n",
199 (double)tot_rtime
/ ((double)NR_READ
* (double)READ_LOOP
));
200 printf("Time per write : %g cycles\n",
201 (double)tot_wtime
/ ((double)NR_WRITE
* (double)WRITE_LOOP
));
202 free(per_thread_lock
);
This page took 0.05078 seconds and 4 git commands to generate.