Rename likely/unlikely to caa_likely/caa_unlikely
[urcu.git] / tests / test_urcu_timing.c
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1/*
2 * test_urcu.c
3 *
4 * Userspace RCU library - test program
5 *
6982d6d7 6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
20bf310a 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>
94b343fd 32#include <errno.h>
ec4e58a3 33#include <urcu/arch.h>
20bf310a 34
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35#ifdef __linux__
36#include <syscall.h>
37#endif
38
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39#if defined(_syscall0)
40_syscall0(pid_t, gettid)
41#elif defined(__NR_gettid)
42static inline pid_t gettid(void)
43{
44 return syscall(__NR_gettid);
45}
46#else
47#warning "use pid as tid"
48static inline pid_t gettid(void)
49{
50 return getpid();
51}
52#endif
53
121a5d44 54#define _LGPL_SOURCE
ec4e58a3 55#include <urcu.h>
20bf310a 56
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57pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
58
59void rcu_copy_mutex_lock(void)
60{
61 int ret;
62 ret = pthread_mutex_lock(&rcu_copy_mutex);
63 if (ret) {
64 perror("Error in pthread mutex lock");
65 exit(-1);
66 }
67}
68
69void rcu_copy_mutex_unlock(void)
70{
71 int ret;
72
73 ret = pthread_mutex_unlock(&rcu_copy_mutex);
74 if (ret) {
75 perror("Error in pthread mutex unlock");
76 exit(-1);
77 }
78}
79
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80struct test_array {
81 int a;
82};
83
84static struct test_array *test_rcu_pointer;
85
86#define OUTER_READ_LOOP 2000U
87#define INNER_READ_LOOP 100000U
88#define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
89
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90#define OUTER_WRITE_LOOP 10U
91#define INNER_WRITE_LOOP 200U
92#define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
20bf310a 93
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94static int num_read;
95static int num_write;
20bf310a 96
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97#define NR_READ num_read
98#define NR_WRITE num_write
99
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100static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time;
101static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time;
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102
103void *thr_reader(void *arg)
104{
1430ee0b 105 int i, j;
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106 struct test_array *local_ptr;
107 cycles_t time1, time2;
108
109 printf("thread_begin %s, thread id : %lx, tid %lu\n",
110 "reader", pthread_self(), (unsigned long)gettid());
111 sleep(2);
112
121a5d44 113 rcu_register_thread();
20bf310a 114
06f22bdb 115 time1 = caa_get_cycles();
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116 for (i = 0; i < OUTER_READ_LOOP; i++) {
117 for (j = 0; j < INNER_READ_LOOP; j++) {
1430ee0b 118 rcu_read_lock();
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119 local_ptr = rcu_dereference(test_rcu_pointer);
120 if (local_ptr) {
121 assert(local_ptr->a == 8);
122 }
1430ee0b 123 rcu_read_unlock();
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124 }
125 }
06f22bdb 126 time2 = caa_get_cycles();
20bf310a 127
121a5d44 128 rcu_unregister_thread();
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129
130 reader_time[(unsigned long)arg] = time2 - time1;
131
132 sleep(2);
133 printf("thread_end %s, thread id : %lx, tid %lu\n",
134 "reader", pthread_self(), (unsigned long)gettid());
135 return ((void*)1);
136
137}
138
139void *thr_writer(void *arg)
140{
102d1d23 141 int i, j;
20bf310a 142 struct test_array *new, *old;
102d1d23 143 cycles_t time1, time2;
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144
145 printf("thread_begin %s, thread id : %lx, tid %lu\n",
146 "writer", pthread_self(), (unsigned long)gettid());
147 sleep(2);
148
102d1d23 149 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
102d1d23 150 for (j = 0; j < INNER_WRITE_LOOP; j++) {
06f22bdb 151 time1 = caa_get_cycles();
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152 new = malloc(sizeof(struct test_array));
153 rcu_copy_mutex_lock();
154 old = test_rcu_pointer;
155 if (old) {
156 assert(old->a == 8);
157 }
158 new->a = 8;
d2835e6f 159 old = rcu_xchg_pointer(&test_rcu_pointer, new);
102d1d23 160 rcu_copy_mutex_unlock();
d2835e6f 161 synchronize_rcu();
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162 /* can be done after unlock */
163 if (old) {
164 old->a = 0;
165 }
166 free(old);
06f22bdb 167 time2 = caa_get_cycles();
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168 writer_time[(unsigned long)arg] += time2 - time1;
169 usleep(1);
20bf310a 170 }
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171 }
172
173 printf("thread_end %s, thread id : %lx, tid %lu\n",
174 "writer", pthread_self(), (unsigned long)gettid());
175 return ((void*)2);
176}
177
2c9689fe 178int main(int argc, char **argv)
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179{
180 int err;
2c9689fe 181 pthread_t *tid_reader, *tid_writer;
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182 void *tret;
183 int i;
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184 cycles_t tot_rtime = 0;
185 cycles_t tot_wtime = 0;
20bf310a 186
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187 if (argc < 2) {
188 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
189 exit(-1);
190 }
191 num_read = atoi(argv[1]);
192 num_write = atoi(argv[2]);
193
194 reader_time = malloc(sizeof(*reader_time) * num_read);
195 writer_time = malloc(sizeof(*writer_time) * num_write);
196 tid_reader = malloc(sizeof(*tid_reader) * num_read);
197 tid_writer = malloc(sizeof(*tid_writer) * num_write);
198
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199 printf("thread %-6s, thread id : %lx, tid %lu\n",
200 "main", pthread_self(), (unsigned long)gettid());
201
202 for (i = 0; i < NR_READ; i++) {
203 err = pthread_create(&tid_reader[i], NULL, thr_reader,
204 (void *)(long)i);
205 if (err != 0)
206 exit(1);
207 }
208 for (i = 0; i < NR_WRITE; i++) {
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209 err = pthread_create(&tid_writer[i], NULL, thr_writer,
210 (void *)(long)i);
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211 if (err != 0)
212 exit(1);
213 }
214
215 sleep(10);
216
217 for (i = 0; i < NR_READ; i++) {
218 err = pthread_join(tid_reader[i], &tret);
219 if (err != 0)
220 exit(1);
102d1d23 221 tot_rtime += reader_time[i];
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222 }
223 for (i = 0; i < NR_WRITE; i++) {
224 err = pthread_join(tid_writer[i], &tret);
225 if (err != 0)
226 exit(1);
102d1d23 227 tot_wtime += writer_time[i];
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228 }
229 free(test_rcu_pointer);
230 printf("Time per read : %g cycles\n",
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231 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
232 printf("Time per write : %g cycles\n",
233 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
20bf310a 234
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235 free(reader_time);
236 free(writer_time);
237 free(tid_reader);
238 free(tid_writer);
239
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240 return 0;
241}
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