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 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
37 #define CACHE_LINE_SIZE 4096
39 #if defined(_syscall0)
40 _syscall0(pid_t
, gettid
)
41 #elif defined(__NR_gettid)
42 static inline pid_t
gettid(void)
44 return syscall(__NR_gettid
);
47 #warning "use pid as tid"
48 static inline pid_t
gettid(void)
60 static struct test_array test_array
= { 8 };
62 struct per_thread_lock
{
64 } __attribute__((aligned(CACHE_LINE_SIZE
))); /* cache-line aligned */
66 static struct per_thread_lock
*per_thread_lock
;
68 #define OUTER_READ_LOOP 200U
69 #define INNER_READ_LOOP 100000U
70 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
72 #define OUTER_WRITE_LOOP 10U
73 #define INNER_WRITE_LOOP 200U
74 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
79 #define NR_READ num_read
80 #define NR_WRITE num_write
82 static cycles_t
__attribute__((aligned(CACHE_LINE_SIZE
))) *reader_time
;
83 static cycles_t
__attribute__((aligned(CACHE_LINE_SIZE
))) *writer_time
;
85 void *thr_reader(void *arg
)
88 cycles_t time1
, time2
;
89 long tidx
= (long)arg
;
91 printf("thread_begin %s, thread id : %lx, tid %lu\n",
92 "reader", pthread_self(), (unsigned long)gettid());
96 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
97 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
98 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
99 assert(test_array
.a
== 8);
100 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
103 time2
= get_cycles();
105 reader_time
[tidx
] = time2
- time1
;
108 printf("thread_end %s, thread id : %lx, tid %lu\n",
109 "reader", pthread_self(), (unsigned long)gettid());
114 void *thr_writer(void *arg
)
118 cycles_t time1
, time2
;
120 printf("thread_begin %s, thread id : %lx, tid %lu\n",
121 "writer", pthread_self(), (unsigned long)gettid());
124 for (i
= 0; i
< OUTER_WRITE_LOOP
; i
++) {
125 for (j
= 0; j
< INNER_WRITE_LOOP
; j
++) {
126 time1
= get_cycles();
127 for (tidx
= 0; tidx
< NR_READ
; tidx
++) {
128 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
131 for (tidx
= NR_READ
- 1; tidx
>= 0; tidx
--) {
132 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
134 time2
= get_cycles();
135 writer_time
[(unsigned long)arg
] += time2
- time1
;
140 printf("thread_end %s, thread id : %lx, tid %lu\n",
141 "writer", pthread_self(), (unsigned long)gettid());
145 int main(int argc
, char **argv
)
148 pthread_t
*tid_reader
, *tid_writer
;
151 cycles_t tot_rtime
= 0;
152 cycles_t tot_wtime
= 0;
155 printf("Usage : %s nr_readers nr_writers\n", argv
[0]);
158 num_read
= atoi(argv
[1]);
159 num_write
= atoi(argv
[2]);
161 reader_time
= malloc(sizeof(*reader_time
) * num_read
);
162 writer_time
= malloc(sizeof(*writer_time
) * num_write
);
163 tid_reader
= malloc(sizeof(*tid_reader
) * num_read
);
164 tid_writer
= malloc(sizeof(*tid_writer
) * num_write
);
166 printf("thread %-6s, thread id : %lx, tid %lu\n",
167 "main", pthread_self(), (unsigned long)gettid());
169 per_thread_lock
= malloc(sizeof(struct per_thread_lock
) * NR_READ
);
171 for (i
= 0; i
< NR_READ
; i
++) {
172 pthread_mutex_init(&per_thread_lock
[i
].lock
, NULL
);
174 for (i
= 0; i
< NR_READ
; i
++) {
175 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
180 for (i
= 0; i
< NR_WRITE
; i
++) {
181 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
189 for (i
= 0; i
< NR_READ
; i
++) {
190 err
= pthread_join(tid_reader
[i
], &tret
);
193 tot_rtime
+= reader_time
[i
];
195 for (i
= 0; i
< NR_WRITE
; i
++) {
196 err
= pthread_join(tid_writer
[i
], &tret
);
199 tot_wtime
+= writer_time
[i
];
201 printf("Time per read : %g cycles\n",
202 (double)tot_rtime
/ ((double)NR_READ
* (double)READ_LOOP
));
203 printf("Time per write : %g cycles\n",
204 (double)tot_wtime
/ ((double)NR_WRITE
* (double)WRITE_LOOP
));
205 free(per_thread_lock
);
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