move whether atomic byte/short exists to uatomic_arch_*.h
[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>
94b343fd 33#include <errno.h>
ec4e58a3 34#include <urcu/arch.h>
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35
36#if defined(_syscall0)
37_syscall0(pid_t, gettid)
38#elif defined(__NR_gettid)
39static inline pid_t gettid(void)
40{
41 return syscall(__NR_gettid);
42}
43#else
44#warning "use pid as tid"
45static inline pid_t gettid(void)
46{
47 return getpid();
48}
49#endif
50
121a5d44 51#define _LGPL_SOURCE
ec4e58a3 52#include <urcu.h>
20bf310a 53
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54pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
55
56void rcu_copy_mutex_lock(void)
57{
58 int ret;
59 ret = pthread_mutex_lock(&rcu_copy_mutex);
60 if (ret) {
61 perror("Error in pthread mutex lock");
62 exit(-1);
63 }
64}
65
66void rcu_copy_mutex_unlock(void)
67{
68 int ret;
69
70 ret = pthread_mutex_unlock(&rcu_copy_mutex);
71 if (ret) {
72 perror("Error in pthread mutex unlock");
73 exit(-1);
74 }
75}
76
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77struct test_array {
78 int a;
79};
80
81static struct test_array *test_rcu_pointer;
82
83#define OUTER_READ_LOOP 2000U
84#define INNER_READ_LOOP 100000U
85#define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
86
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87#define OUTER_WRITE_LOOP 10U
88#define INNER_WRITE_LOOP 200U
89#define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
20bf310a 90
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91static int num_read;
92static int num_write;
20bf310a 93
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94#define NR_READ num_read
95#define NR_WRITE num_write
96
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97static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time;
98static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time;
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99
100void *thr_reader(void *arg)
101{
1430ee0b 102 int i, j;
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103 struct test_array *local_ptr;
104 cycles_t time1, time2;
105
106 printf("thread_begin %s, thread id : %lx, tid %lu\n",
107 "reader", pthread_self(), (unsigned long)gettid());
108 sleep(2);
109
121a5d44 110 rcu_register_thread();
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111
112 time1 = get_cycles();
113 for (i = 0; i < OUTER_READ_LOOP; i++) {
114 for (j = 0; j < INNER_READ_LOOP; j++) {
1430ee0b 115 rcu_read_lock();
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116 local_ptr = rcu_dereference(test_rcu_pointer);
117 if (local_ptr) {
118 assert(local_ptr->a == 8);
119 }
1430ee0b 120 rcu_read_unlock();
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121 }
122 }
123 time2 = get_cycles();
124
121a5d44 125 rcu_unregister_thread();
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126
127 reader_time[(unsigned long)arg] = time2 - time1;
128
129 sleep(2);
130 printf("thread_end %s, thread id : %lx, tid %lu\n",
131 "reader", pthread_self(), (unsigned long)gettid());
132 return ((void*)1);
133
134}
135
136void *thr_writer(void *arg)
137{
102d1d23 138 int i, j;
20bf310a 139 struct test_array *new, *old;
102d1d23 140 cycles_t time1, time2;
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141
142 printf("thread_begin %s, thread id : %lx, tid %lu\n",
143 "writer", pthread_self(), (unsigned long)gettid());
144 sleep(2);
145
102d1d23 146 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
102d1d23 147 for (j = 0; j < INNER_WRITE_LOOP; j++) {
fc606a74 148 time1 = get_cycles();
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149 new = malloc(sizeof(struct test_array));
150 rcu_copy_mutex_lock();
151 old = test_rcu_pointer;
152 if (old) {
153 assert(old->a == 8);
154 }
155 new->a = 8;
d2835e6f 156 old = rcu_xchg_pointer(&test_rcu_pointer, new);
102d1d23 157 rcu_copy_mutex_unlock();
d2835e6f 158 synchronize_rcu();
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159 /* can be done after unlock */
160 if (old) {
161 old->a = 0;
162 }
163 free(old);
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164 time2 = get_cycles();
165 writer_time[(unsigned long)arg] += time2 - time1;
166 usleep(1);
20bf310a 167 }
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168 }
169
170 printf("thread_end %s, thread id : %lx, tid %lu\n",
171 "writer", pthread_self(), (unsigned long)gettid());
172 return ((void*)2);
173}
174
2c9689fe 175int main(int argc, char **argv)
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176{
177 int err;
2c9689fe 178 pthread_t *tid_reader, *tid_writer;
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179 void *tret;
180 int i;
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181 cycles_t tot_rtime = 0;
182 cycles_t tot_wtime = 0;
20bf310a 183
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184 if (argc < 2) {
185 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
186 exit(-1);
187 }
188 num_read = atoi(argv[1]);
189 num_write = atoi(argv[2]);
190
191 reader_time = malloc(sizeof(*reader_time) * num_read);
192 writer_time = malloc(sizeof(*writer_time) * num_write);
193 tid_reader = malloc(sizeof(*tid_reader) * num_read);
194 tid_writer = malloc(sizeof(*tid_writer) * num_write);
195
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196 printf("thread %-6s, thread id : %lx, tid %lu\n",
197 "main", pthread_self(), (unsigned long)gettid());
198
199 for (i = 0; i < NR_READ; i++) {
200 err = pthread_create(&tid_reader[i], NULL, thr_reader,
201 (void *)(long)i);
202 if (err != 0)
203 exit(1);
204 }
205 for (i = 0; i < NR_WRITE; i++) {
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206 err = pthread_create(&tid_writer[i], NULL, thr_writer,
207 (void *)(long)i);
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208 if (err != 0)
209 exit(1);
210 }
211
212 sleep(10);
213
214 for (i = 0; i < NR_READ; i++) {
215 err = pthread_join(tid_reader[i], &tret);
216 if (err != 0)
217 exit(1);
102d1d23 218 tot_rtime += reader_time[i];
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219 }
220 for (i = 0; i < NR_WRITE; i++) {
221 err = pthread_join(tid_writer[i], &tret);
222 if (err != 0)
223 exit(1);
102d1d23 224 tot_wtime += writer_time[i];
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225 }
226 free(test_rcu_pointer);
227 printf("Time per read : %g cycles\n",
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228 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
229 printf("Time per write : %g cycles\n",
230 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
20bf310a 231
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232 free(reader_time);
233 free(writer_time);
234 free(tid_reader);
235 free(tid_writer);
236
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237 return 0;
238}
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