rculfstack: header implementation should be defined as static inline
[urcu.git] / tests / test_qsbr_timing.c
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1/*
2 * test_qsbr_timing.c
3 *
4 * Userspace QSBR - test program
5 *
6982d6d7 6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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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>
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32#include <errno.h>
33
ec4e58a3 34#include <urcu/arch.h>
420e5b92 35
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36#ifdef __linux__
37#include <syscall.h>
38#endif
39
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40#if defined(_syscall0)
41_syscall0(pid_t, gettid)
42#elif defined(__NR_gettid)
43static inline pid_t gettid(void)
44{
45 return syscall(__NR_gettid);
46}
47#else
48#warning "use pid as tid"
49static inline pid_t gettid(void)
50{
51 return getpid();
52}
53#endif
54
55#define _LGPL_SOURCE
ec4e58a3 56#include <urcu-qsbr.h>
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57
58pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
59
60void rcu_copy_mutex_lock(void)
61{
62 int ret;
63 ret = pthread_mutex_lock(&rcu_copy_mutex);
64 if (ret) {
65 perror("Error in pthread mutex lock");
66 exit(-1);
67 }
68}
69
70void rcu_copy_mutex_unlock(void)
71{
72 int ret;
73
74 ret = pthread_mutex_unlock(&rcu_copy_mutex);
75 if (ret) {
76 perror("Error in pthread mutex unlock");
77 exit(-1);
78 }
79}
80
81struct test_array {
82 int a;
83};
84
85static struct test_array *test_rcu_pointer;
86
87#define OUTER_READ_LOOP 2000U
88#define INNER_READ_LOOP 100000U
89#define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
90
91#define OUTER_WRITE_LOOP 10U
92#define INNER_WRITE_LOOP 200U
93#define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
94
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95static int num_read;
96static int num_write;
420e5b92 97
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98#define NR_READ num_read
99#define NR_WRITE num_write
100
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101static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time;
102static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time;
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103
104void *thr_reader(void *arg)
105{
106 int i, j;
107 struct test_array *local_ptr;
108 cycles_t time1, time2;
109
110 printf("thread_begin %s, thread id : %lx, tid %lu\n",
111 "reader", pthread_self(), (unsigned long)gettid());
112 sleep(2);
113
114 rcu_register_thread();
115
06f22bdb 116 time1 = caa_get_cycles();
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117 for (i = 0; i < OUTER_READ_LOOP; i++) {
118 for (j = 0; j < INNER_READ_LOOP; j++) {
119 _rcu_read_lock();
120 local_ptr = _rcu_dereference(test_rcu_pointer);
121 if (local_ptr) {
122 assert(local_ptr->a == 8);
123 }
124 _rcu_read_unlock();
125 }
126 _rcu_quiescent_state();
127 }
06f22bdb 128 time2 = caa_get_cycles();
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129
130 rcu_unregister_thread();
131
132 reader_time[(unsigned long)arg] = time2 - time1;
133
134 sleep(2);
135 printf("thread_end %s, thread id : %lx, tid %lu\n",
136 "reader", pthread_self(), (unsigned long)gettid());
137 return ((void*)1);
138
139}
140
141void *thr_writer(void *arg)
142{
143 int i, j;
144 struct test_array *new, *old;
145 cycles_t time1, time2;
146
147 printf("thread_begin %s, thread id : %lx, tid %lu\n",
148 "writer", pthread_self(), (unsigned long)gettid());
149 sleep(2);
150
151 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
152 for (j = 0; j < INNER_WRITE_LOOP; j++) {
06f22bdb 153 time1 = caa_get_cycles();
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154 new = malloc(sizeof(struct test_array));
155 rcu_copy_mutex_lock();
156 old = test_rcu_pointer;
157 if (old) {
158 assert(old->a == 8);
159 }
160 new->a = 8;
d2835e6f 161 old = rcu_xchg_pointer(&test_rcu_pointer, new);
420e5b92 162 rcu_copy_mutex_unlock();
d2835e6f 163 synchronize_rcu();
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164 /* can be done after unlock */
165 if (old) {
166 old->a = 0;
167 }
168 free(old);
06f22bdb 169 time2 = caa_get_cycles();
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170 writer_time[(unsigned long)arg] += time2 - time1;
171 usleep(1);
172 }
173 }
174
175 printf("thread_end %s, thread id : %lx, tid %lu\n",
176 "writer", pthread_self(), (unsigned long)gettid());
177 return ((void*)2);
178}
179
2c9689fe 180int main(int argc, char **argv)
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181{
182 int err;
2c9689fe 183 pthread_t *tid_reader, *tid_writer;
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184 void *tret;
185 int i;
186 cycles_t tot_rtime = 0;
187 cycles_t tot_wtime = 0;
188
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189 if (argc < 2) {
190 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
191 exit(-1);
192 }
193 num_read = atoi(argv[1]);
194 num_write = atoi(argv[2]);
195
196 reader_time = malloc(sizeof(*reader_time) * num_read);
197 writer_time = malloc(sizeof(*writer_time) * num_write);
198 tid_reader = malloc(sizeof(*tid_reader) * num_read);
199 tid_writer = malloc(sizeof(*tid_writer) * num_write);
200
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201 printf("thread %-6s, thread id : %lx, tid %lu\n",
202 "main", pthread_self(), (unsigned long)gettid());
203
204 for (i = 0; i < NR_READ; i++) {
205 err = pthread_create(&tid_reader[i], NULL, thr_reader,
206 (void *)(long)i);
207 if (err != 0)
208 exit(1);
209 }
210 for (i = 0; i < NR_WRITE; i++) {
211 err = pthread_create(&tid_writer[i], NULL, thr_writer,
212 (void *)(long)i);
213 if (err != 0)
214 exit(1);
215 }
216
217 sleep(10);
218
219 for (i = 0; i < NR_READ; i++) {
220 err = pthread_join(tid_reader[i], &tret);
221 if (err != 0)
222 exit(1);
223 tot_rtime += reader_time[i];
224 }
225 for (i = 0; i < NR_WRITE; i++) {
226 err = pthread_join(tid_writer[i], &tret);
227 if (err != 0)
228 exit(1);
229 tot_wtime += writer_time[i];
230 }
231 free(test_rcu_pointer);
232 printf("Time per read : %g cycles\n",
233 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
234 printf("Time per write : %g cycles\n",
235 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
236
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237 free(reader_time);
238 free(writer_time);
239 free(tid_reader);
240 free(tid_writer);
241
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242 return 0;
243}
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