bc51c45c3573a6b9611673048a2cefacaacce629
[urcu.git] / tests / benchmark / 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@efficios.com>
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 <pthread.h>
33 #include <errno.h>
34
35 #include <urcu/arch.h>
36
37 #include "thread-id.h"
38
39 #include <urcu.h>
40
41 struct test_array {
42 int a;
43 };
44
45 /*
46 * static rwlock initializer is broken on Cygwin. Use runtime
47 * initialization.
48 */
49 pthread_rwlock_t lock;
50
51 static struct test_array test_array = { 8 };
52
53 #define OUTER_READ_LOOP 200U
54 #define INNER_READ_LOOP 100000U
55 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
56
57 #define OUTER_WRITE_LOOP 10U
58 #define INNER_WRITE_LOOP 200U
59 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
60
61 static int num_read;
62 static int num_write;
63
64 #define NR_READ num_read
65 #define NR_WRITE num_write
66
67 static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time;
68 static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time;
69
70 void *thr_reader(void *arg)
71 {
72 int i, j, ret;
73 caa_cycles_t time1, time2;
74
75 printf("thread_begin %s, tid %lu\n",
76 "reader", urcu_get_thread_id());
77 sleep(2);
78
79 time1 = caa_get_cycles();
80 for (i = 0; i < OUTER_READ_LOOP; i++) {
81 for (j = 0; j < INNER_READ_LOOP; j++) {
82 ret = pthread_rwlock_rdlock(&lock);
83 if (ret) {
84 fprintf(stderr, "reader pthread_rwlock_rdlock: %s\n", strerror(ret));
85 abort();
86 }
87
88 assert(test_array.a == 8);
89
90 ret = pthread_rwlock_unlock(&lock);
91 if (ret) {
92 fprintf(stderr, "reader pthread_rwlock_unlock: %s\n", strerror(ret));
93 abort();
94 }
95 }
96 }
97 time2 = caa_get_cycles();
98
99 reader_time[(unsigned long)arg] = time2 - time1;
100
101 sleep(2);
102 printf("thread_end %s, tid %lu\n",
103 "reader", urcu_get_thread_id());
104 return ((void*)1);
105
106 }
107
108 void *thr_writer(void *arg)
109 {
110 int i, j, ret;
111 caa_cycles_t time1, time2;
112
113 printf("thread_begin %s, tid %lu\n",
114 "writer", urcu_get_thread_id());
115 sleep(2);
116
117 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
118 for (j = 0; j < INNER_WRITE_LOOP; j++) {
119 time1 = caa_get_cycles();
120 ret = pthread_rwlock_wrlock(&lock);
121 if (ret) {
122 fprintf(stderr, "writer pthread_rwlock_wrlock: %s\n", strerror(ret));
123 abort();
124 }
125
126 test_array.a = 8;
127
128 ret = pthread_rwlock_unlock(&lock);
129 if (ret) {
130 fprintf(stderr, "writer pthread_rwlock_unlock: %s\n", strerror(ret));
131 abort();
132 }
133
134 time2 = caa_get_cycles();
135 writer_time[(unsigned long)arg] += time2 - time1;
136 usleep(1);
137 }
138 }
139
140 printf("thread_end %s, tid %lu\n",
141 "writer", urcu_get_thread_id());
142 return ((void*)2);
143 }
144
145 int main(int argc, char **argv)
146 {
147 int err;
148 pthread_t *tid_reader, *tid_writer;
149 void *tret;
150 int i;
151 caa_cycles_t tot_rtime = 0;
152 caa_cycles_t tot_wtime = 0;
153
154 if (argc < 2) {
155 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
156 exit(-1);
157 }
158 num_read = atoi(argv[1]);
159 num_write = atoi(argv[2]);
160
161 err = pthread_rwlock_init(&lock, NULL);
162 if (err != 0) {
163 fprintf(stderr, "pthread_rwlock_init: (%d) %s\n", err, strerror(err));
164 exit(1);
165 }
166
167 reader_time = calloc(num_read, sizeof(*reader_time));
168 writer_time = calloc(num_write, sizeof(*writer_time));
169 tid_reader = calloc(num_read, sizeof(*tid_reader));
170 tid_writer = calloc(num_write, sizeof(*tid_writer));
171
172 printf("thread %-6s, tid %lu\n",
173 "main", urcu_get_thread_id());
174
175 for (i = 0; i < NR_READ; i++) {
176 err = pthread_create(&tid_reader[i], NULL, thr_reader,
177 (void *)(long)i);
178 if (err != 0)
179 exit(1);
180 }
181 for (i = 0; i < NR_WRITE; i++) {
182 err = pthread_create(&tid_writer[i], NULL, thr_writer,
183 (void *)(long)i);
184 if (err != 0)
185 exit(1);
186 }
187
188 sleep(10);
189
190 for (i = 0; i < NR_READ; i++) {
191 err = pthread_join(tid_reader[i], &tret);
192 if (err != 0)
193 exit(1);
194 tot_rtime += reader_time[i];
195 }
196 for (i = 0; i < NR_WRITE; i++) {
197 err = pthread_join(tid_writer[i], &tret);
198 if (err != 0)
199 exit(1);
200 tot_wtime += writer_time[i];
201 }
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
207 err = pthread_rwlock_destroy(&lock);
208 if (err != 0) {
209 fprintf(stderr, "pthread_rwlock_destroy: (%d) %s\n", err, strerror(err));
210 exit(1);
211 }
212 free(reader_time);
213 free(writer_time);
214 free(tid_reader);
215 free(tid_writer);
216
217 return 0;
218 }
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