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>
37 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
38 #define CACHE_LINE_SIZE 4096
40 #if defined(_syscall0)
41 _syscall0(pid_t
, gettid
)
42 #elif defined(__NR_gettid)
43 static inline pid_t
gettid(void)
45 return syscall(__NR_gettid
);
48 #warning "use pid as tid"
49 static inline pid_t
gettid(void)
61 static struct test_array test_array
= { 8 };
63 struct per_thread_lock
{
65 } __attribute__((aligned(CACHE_LINE_SIZE
))); /* cache-line aligned */
67 static struct per_thread_lock
*per_thread_lock
;
69 #define OUTER_READ_LOOP 200U
70 #define INNER_READ_LOOP 100000U
71 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
73 #define OUTER_WRITE_LOOP 10U
74 #define INNER_WRITE_LOOP 200U
75 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
80 #define NR_READ num_read
81 #define NR_WRITE num_write
83 static cycles_t
__attribute__((aligned(CACHE_LINE_SIZE
))) *reader_time
;
84 static cycles_t
__attribute__((aligned(CACHE_LINE_SIZE
))) *writer_time
;
86 void *thr_reader(void *arg
)
89 cycles_t time1
, time2
;
90 long tidx
= (long)arg
;
92 printf("thread_begin %s, thread id : %lx, tid %lu\n",
93 "reader", pthread_self(), (unsigned long)gettid());
97 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
98 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
99 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
100 assert(test_array
.a
== 8);
101 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
104 time2
= get_cycles();
106 reader_time
[tidx
] = time2
- time1
;
109 printf("thread_end %s, thread id : %lx, tid %lu\n",
110 "reader", pthread_self(), (unsigned long)gettid());
115 void *thr_writer(void *arg
)
119 cycles_t time1
, time2
;
121 printf("thread_begin %s, thread id : %lx, tid %lu\n",
122 "writer", pthread_self(), (unsigned long)gettid());
125 for (i
= 0; i
< OUTER_WRITE_LOOP
; i
++) {
126 for (j
= 0; j
< INNER_WRITE_LOOP
; j
++) {
127 time1
= get_cycles();
128 for (tidx
= 0; tidx
< NR_READ
; tidx
++) {
129 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
132 for (tidx
= NR_READ
- 1; tidx
>= 0; tidx
--) {
133 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
135 time2
= get_cycles();
136 writer_time
[(unsigned long)arg
] += time2
- time1
;
141 printf("thread_end %s, thread id : %lx, tid %lu\n",
142 "writer", pthread_self(), (unsigned long)gettid());
146 int main(int argc
, char **argv
)
149 pthread_t
*tid_reader
, *tid_writer
;
152 cycles_t tot_rtime
= 0;
153 cycles_t tot_wtime
= 0;
156 printf("Usage : %s nr_readers nr_writers\n", argv
[0]);
159 num_read
= atoi(argv
[1]);
160 num_write
= atoi(argv
[2]);
162 reader_time
= malloc(sizeof(*reader_time
) * num_read
);
163 writer_time
= malloc(sizeof(*writer_time
) * num_write
);
164 tid_reader
= malloc(sizeof(*tid_reader
) * num_read
);
165 tid_writer
= malloc(sizeof(*tid_writer
) * num_write
);
167 printf("thread %-6s, thread id : %lx, tid %lu\n",
168 "main", pthread_self(), (unsigned long)gettid());
170 per_thread_lock
= malloc(sizeof(struct per_thread_lock
) * NR_READ
);
172 for (i
= 0; i
< NR_READ
; i
++) {
173 pthread_mutex_init(&per_thread_lock
[i
].lock
, NULL
);
175 for (i
= 0; i
< NR_READ
; i
++) {
176 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
181 for (i
= 0; i
< NR_WRITE
; i
++) {
182 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
190 for (i
= 0; i
< NR_READ
; i
++) {
191 err
= pthread_join(tid_reader
[i
], &tret
);
194 tot_rtime
+= reader_time
[i
];
196 for (i
= 0; i
< NR_WRITE
; i
++) {
197 err
= pthread_join(tid_writer
[i
], &tret
);
200 tot_wtime
+= writer_time
[i
];
202 printf("Time per read : %g cycles\n",
203 (double)tot_rtime
/ ((double)NR_READ
* (double)READ_LOOP
));
204 printf("Time per write : %g cycles\n",
205 (double)tot_wtime
/ ((double)NR_WRITE
* (double)WRITE_LOOP
));
206 free(per_thread_lock
);
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