rculist: include correct dependencies
[urcu.git] / tests / test_urcu_timing.c
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1/*
2 * test_urcu.c
3 *
4 * Userspace RCU library - test program
5 *
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
7 *
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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.
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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>
ec4e58a3 33#include <urcu/arch.h>
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34
35#if defined(_syscall0)
36_syscall0(pid_t, gettid)
37#elif defined(__NR_gettid)
38static inline pid_t gettid(void)
39{
40 return syscall(__NR_gettid);
41}
42#else
43#warning "use pid as tid"
44static inline pid_t gettid(void)
45{
46 return getpid();
47}
48#endif
49
121a5d44 50#define _LGPL_SOURCE
ec4e58a3 51#include <urcu.h>
20bf310a 52
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53pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
54
55void rcu_copy_mutex_lock(void)
56{
57 int ret;
58 ret = pthread_mutex_lock(&rcu_copy_mutex);
59 if (ret) {
60 perror("Error in pthread mutex lock");
61 exit(-1);
62 }
63}
64
65void rcu_copy_mutex_unlock(void)
66{
67 int ret;
68
69 ret = pthread_mutex_unlock(&rcu_copy_mutex);
70 if (ret) {
71 perror("Error in pthread mutex unlock");
72 exit(-1);
73 }
74}
75
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76struct test_array {
77 int a;
78};
79
80static struct test_array *test_rcu_pointer;
81
82#define OUTER_READ_LOOP 2000U
83#define INNER_READ_LOOP 100000U
84#define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
85
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86#define OUTER_WRITE_LOOP 10U
87#define INNER_WRITE_LOOP 200U
88#define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
20bf310a 89
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90static int num_read;
91static int num_write;
20bf310a 92
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93#define NR_READ num_read
94#define NR_WRITE num_write
95
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96static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time;
97static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time;
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98
99void *thr_reader(void *arg)
100{
1430ee0b 101 int i, j;
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102 struct test_array *local_ptr;
103 cycles_t time1, time2;
104
105 printf("thread_begin %s, thread id : %lx, tid %lu\n",
106 "reader", pthread_self(), (unsigned long)gettid());
107 sleep(2);
108
121a5d44 109 rcu_register_thread();
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110
111 time1 = get_cycles();
112 for (i = 0; i < OUTER_READ_LOOP; i++) {
113 for (j = 0; j < INNER_READ_LOOP; j++) {
1430ee0b 114 rcu_read_lock();
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115 local_ptr = rcu_dereference(test_rcu_pointer);
116 if (local_ptr) {
117 assert(local_ptr->a == 8);
118 }
1430ee0b 119 rcu_read_unlock();
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120 }
121 }
122 time2 = get_cycles();
123
121a5d44 124 rcu_unregister_thread();
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125
126 reader_time[(unsigned long)arg] = time2 - time1;
127
128 sleep(2);
129 printf("thread_end %s, thread id : %lx, tid %lu\n",
130 "reader", pthread_self(), (unsigned long)gettid());
131 return ((void*)1);
132
133}
134
135void *thr_writer(void *arg)
136{
102d1d23 137 int i, j;
20bf310a 138 struct test_array *new, *old;
102d1d23 139 cycles_t time1, time2;
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140
141 printf("thread_begin %s, thread id : %lx, tid %lu\n",
142 "writer", pthread_self(), (unsigned long)gettid());
143 sleep(2);
144
102d1d23 145 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
102d1d23 146 for (j = 0; j < INNER_WRITE_LOOP; j++) {
fc606a74 147 time1 = get_cycles();
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148 new = malloc(sizeof(struct test_array));
149 rcu_copy_mutex_lock();
150 old = test_rcu_pointer;
151 if (old) {
152 assert(old->a == 8);
153 }
154 new->a = 8;
155 old = rcu_publish_content(&test_rcu_pointer, new);
156 rcu_copy_mutex_unlock();
157 /* can be done after unlock */
158 if (old) {
159 old->a = 0;
160 }
161 free(old);
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162 time2 = get_cycles();
163 writer_time[(unsigned long)arg] += time2 - time1;
164 usleep(1);
20bf310a 165 }
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166 }
167
168 printf("thread_end %s, thread id : %lx, tid %lu\n",
169 "writer", pthread_self(), (unsigned long)gettid());
170 return ((void*)2);
171}
172
2c9689fe 173int main(int argc, char **argv)
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174{
175 int err;
2c9689fe 176 pthread_t *tid_reader, *tid_writer;
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177 void *tret;
178 int i;
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179 cycles_t tot_rtime = 0;
180 cycles_t tot_wtime = 0;
20bf310a 181
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182 if (argc < 2) {
183 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
184 exit(-1);
185 }
186 num_read = atoi(argv[1]);
187 num_write = atoi(argv[2]);
188
189 reader_time = malloc(sizeof(*reader_time) * num_read);
190 writer_time = malloc(sizeof(*writer_time) * num_write);
191 tid_reader = malloc(sizeof(*tid_reader) * num_read);
192 tid_writer = malloc(sizeof(*tid_writer) * num_write);
193
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194 printf("thread %-6s, thread id : %lx, tid %lu\n",
195 "main", pthread_self(), (unsigned long)gettid());
196
197 for (i = 0; i < NR_READ; i++) {
198 err = pthread_create(&tid_reader[i], NULL, thr_reader,
199 (void *)(long)i);
200 if (err != 0)
201 exit(1);
202 }
203 for (i = 0; i < NR_WRITE; i++) {
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204 err = pthread_create(&tid_writer[i], NULL, thr_writer,
205 (void *)(long)i);
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206 if (err != 0)
207 exit(1);
208 }
209
210 sleep(10);
211
212 for (i = 0; i < NR_READ; i++) {
213 err = pthread_join(tid_reader[i], &tret);
214 if (err != 0)
215 exit(1);
102d1d23 216 tot_rtime += reader_time[i];
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217 }
218 for (i = 0; i < NR_WRITE; i++) {
219 err = pthread_join(tid_writer[i], &tret);
220 if (err != 0)
221 exit(1);
102d1d23 222 tot_wtime += writer_time[i];
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223 }
224 free(test_rcu_pointer);
225 printf("Time per read : %g cycles\n",
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226 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
227 printf("Time per write : %g cycles\n",
228 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
20bf310a 229
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230 free(reader_time);
231 free(writer_time);
232 free(tid_reader);
233 free(tid_writer);
234
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235 return 0;
236}
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