4 * Userspace RCU library - 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 pthread_rwlock_t lock
= PTHREAD_RWLOCK_INITIALIZER
;
62 static struct test_array test_array
= { 8 };
64 #define OUTER_READ_LOOP 200U
65 #define INNER_READ_LOOP 100000U
66 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
68 #define OUTER_WRITE_LOOP 10U
69 #define INNER_WRITE_LOOP 200U
70 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
75 #define NR_READ num_read
76 #define NR_WRITE num_write
78 static cycles_t
__attribute__((aligned(CACHE_LINE_SIZE
))) *reader_time
;
79 static cycles_t
__attribute__((aligned(CACHE_LINE_SIZE
))) *writer_time
;
81 void *thr_reader(void *arg
)
84 cycles_t time1
, time2
;
86 printf("thread_begin %s, thread id : %lx, tid %lu\n",
87 "reader", pthread_self(), (unsigned long)gettid());
91 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
92 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
93 pthread_rwlock_rdlock(&lock
);
94 assert(test_array
.a
== 8);
95 pthread_rwlock_unlock(&lock
);
100 reader_time
[(unsigned long)arg
] = time2
- time1
;
103 printf("thread_end %s, thread id : %lx, tid %lu\n",
104 "reader", pthread_self(), (unsigned long)gettid());
109 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 pthread_rwlock_wrlock(&lock
);
123 pthread_rwlock_unlock(&lock
);
124 time2
= get_cycles();
125 writer_time
[(unsigned long)arg
] += time2
- time1
;
130 printf("thread_end %s, thread id : %lx, tid %lu\n",
131 "writer", pthread_self(), (unsigned long)gettid());
135 int main(int argc
, char **argv
)
138 pthread_t
*tid_reader
, *tid_writer
;
141 cycles_t tot_rtime
= 0;
142 cycles_t tot_wtime
= 0;
145 printf("Usage : %s nr_readers nr_writers\n", argv
[0]);
148 num_read
= atoi(argv
[1]);
149 num_write
= atoi(argv
[2]);
151 reader_time
= malloc(sizeof(*reader_time
) * num_read
);
152 writer_time
= malloc(sizeof(*writer_time
) * num_write
);
153 tid_reader
= malloc(sizeof(*tid_reader
) * num_read
);
154 tid_writer
= malloc(sizeof(*tid_writer
) * num_write
);
156 printf("thread %-6s, thread id : %lx, tid %lu\n",
157 "main", pthread_self(), (unsigned long)gettid());
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
));