5369796759bfa950108117c5d4a864ca6aa06721
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 static cycles_t reader_time
[NR_READ
] __attribute__((aligned(128)));
77 static cycles_t writer_time
[NR_WRITE
] __attribute__((aligned(128)));
79 void *thr_reader(void *arg
)
82 cycles_t time1
, time2
;
83 long tidx
= (long)arg
;
85 printf("thread_begin %s, thread id : %lx, tid %lu\n",
86 "reader", pthread_self(), (unsigned long)gettid());
90 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
91 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
92 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
93 assert(test_array
.a
== 8);
94 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
99 reader_time
[tidx
] = time2
- time1
;
102 printf("thread_end %s, thread id : %lx, tid %lu\n",
103 "reader", pthread_self(), (unsigned long)gettid());
108 void *thr_writer(void *arg
)
112 cycles_t time1
, time2
;
114 printf("thread_begin %s, thread id : %lx, tid %lu\n",
115 "writer", pthread_self(), (unsigned long)gettid());
118 for (i
= 0; i
< OUTER_WRITE_LOOP
; i
++) {
119 for (j
= 0; j
< INNER_WRITE_LOOP
; j
++) {
120 time1
= get_cycles();
121 for (tidx
= 0; tidx
< NR_READ
; tidx
++) {
122 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
125 for (tidx
= NR_READ
- 1; tidx
>= 0; tidx
--) {
126 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
128 time2
= get_cycles();
129 writer_time
[(unsigned long)arg
] += time2
- time1
;
134 printf("thread_end %s, thread id : %lx, tid %lu\n",
135 "writer", pthread_self(), (unsigned long)gettid());
142 pthread_t tid_reader
[NR_READ
], tid_writer
[NR_WRITE
];
145 cycles_t tot_rtime
= 0;
146 cycles_t tot_wtime
= 0;
148 printf("thread %-6s, thread id : %lx, tid %lu\n",
149 "main", pthread_self(), (unsigned long)gettid());
151 per_thread_lock
= malloc(sizeof(struct per_thread_lock
) * NR_READ
);
153 for (i
= 0; i
< NR_READ
; i
++) {
154 pthread_mutex_init(&per_thread_lock
[i
].lock
, NULL
);
156 for (i
= 0; i
< NR_READ
; i
++) {
157 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
162 for (i
= 0; i
< NR_WRITE
; i
++) {
163 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
171 for (i
= 0; i
< NR_READ
; i
++) {
172 err
= pthread_join(tid_reader
[i
], &tret
);
175 tot_rtime
+= reader_time
[i
];
177 for (i
= 0; i
< NR_WRITE
; i
++) {
178 err
= pthread_join(tid_writer
[i
], &tret
);
181 tot_wtime
+= writer_time
[i
];
183 printf("Time per read : %g cycles\n",
184 (double)tot_rtime
/ ((double)NR_READ
* (double)READ_LOOP
));
185 printf("Time per write : %g cycles\n",
186 (double)tot_wtime
/ ((double)NR_WRITE
* (double)WRITE_LOOP
));
187 free(per_thread_lock
);
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