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[urcu.git] / tests / test_rwlock_timing.c
1 /*
2 * test_urcu.c
3 *
4 * Userspace RCU library - test program
5 *
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
7 *
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.
12 *
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.
17 *
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.
21 */
22
23 #include <stdio.h>
24 #include <pthread.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <sys/types.h>
28 #include <sys/wait.h>
29 #include <unistd.h>
30 #include <stdio.h>
31 #include <assert.h>
32 #include <sys/syscall.h>
33 #include <pthread.h>
34 #include <urcu/arch.h>
35
36 #if defined(_syscall0)
37 _syscall0(pid_t, gettid)
38 #elif defined(__NR_gettid)
39 static inline pid_t gettid(void)
40 {
41 return syscall(__NR_gettid);
42 }
43 #else
44 #warning "use pid as tid"
45 static inline pid_t gettid(void)
46 {
47 return getpid();
48 }
49 #endif
50
51 #include <urcu.h>
52
53 struct test_array {
54 int a;
55 };
56
57 pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
58
59 static struct test_array test_array = { 8 };
60
61 #define OUTER_READ_LOOP 200U
62 #define INNER_READ_LOOP 100000U
63 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
64
65 #define OUTER_WRITE_LOOP 10U
66 #define INNER_WRITE_LOOP 200U
67 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
68
69 static int num_read;
70 static int num_write;
71
72 #define NR_READ num_read
73 #define NR_WRITE num_write
74
75 static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time;
76 static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time;
77
78 void *thr_reader(void *arg)
79 {
80 int i, j;
81 cycles_t time1, time2;
82
83 printf("thread_begin %s, thread id : %lx, tid %lu\n",
84 "reader", pthread_self(), (unsigned long)gettid());
85 sleep(2);
86
87 time1 = get_cycles();
88 for (i = 0; i < OUTER_READ_LOOP; i++) {
89 for (j = 0; j < INNER_READ_LOOP; j++) {
90 pthread_rwlock_rdlock(&lock);
91 assert(test_array.a == 8);
92 pthread_rwlock_unlock(&lock);
93 }
94 }
95 time2 = get_cycles();
96
97 reader_time[(unsigned long)arg] = time2 - time1;
98
99 sleep(2);
100 printf("thread_end %s, thread id : %lx, tid %lu\n",
101 "reader", pthread_self(), (unsigned long)gettid());
102 return ((void*)1);
103
104 }
105
106 void *thr_writer(void *arg)
107 {
108 int i, j;
109 cycles_t time1, time2;
110
111 printf("thread_begin %s, thread id : %lx, tid %lu\n",
112 "writer", pthread_self(), (unsigned long)gettid());
113 sleep(2);
114
115 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
116 for (j = 0; j < INNER_WRITE_LOOP; j++) {
117 time1 = get_cycles();
118 pthread_rwlock_wrlock(&lock);
119 test_array.a = 8;
120 pthread_rwlock_unlock(&lock);
121 time2 = get_cycles();
122 writer_time[(unsigned long)arg] += time2 - time1;
123 usleep(1);
124 }
125 }
126
127 printf("thread_end %s, thread id : %lx, tid %lu\n",
128 "writer", pthread_self(), (unsigned long)gettid());
129 return ((void*)2);
130 }
131
132 int main(int argc, char **argv)
133 {
134 int err;
135 pthread_t *tid_reader, *tid_writer;
136 void *tret;
137 int i;
138 cycles_t tot_rtime = 0;
139 cycles_t tot_wtime = 0;
140
141 if (argc < 2) {
142 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
143 exit(-1);
144 }
145 num_read = atoi(argv[1]);
146 num_write = atoi(argv[2]);
147
148 reader_time = malloc(sizeof(*reader_time) * num_read);
149 writer_time = malloc(sizeof(*writer_time) * num_write);
150 tid_reader = malloc(sizeof(*tid_reader) * num_read);
151 tid_writer = malloc(sizeof(*tid_writer) * num_write);
152
153 printf("thread %-6s, thread id : %lx, tid %lu\n",
154 "main", pthread_self(), (unsigned long)gettid());
155
156 for (i = 0; i < NR_READ; i++) {
157 err = pthread_create(&tid_reader[i], NULL, thr_reader,
158 (void *)(long)i);
159 if (err != 0)
160 exit(1);
161 }
162 for (i = 0; i < NR_WRITE; i++) {
163 err = pthread_create(&tid_writer[i], NULL, thr_writer,
164 (void *)(long)i);
165 if (err != 0)
166 exit(1);
167 }
168
169 sleep(10);
170
171 for (i = 0; i < NR_READ; i++) {
172 err = pthread_join(tid_reader[i], &tret);
173 if (err != 0)
174 exit(1);
175 tot_rtime += reader_time[i];
176 }
177 for (i = 0; i < NR_WRITE; i++) {
178 err = pthread_join(tid_writer[i], &tret);
179 if (err != 0)
180 exit(1);
181 tot_wtime += writer_time[i];
182 }
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
188 free(reader_time);
189 free(writer_time);
190 free(tid_reader);
191 free(tid_writer);
192
193 return 0;
194 }
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