Fix typo in license file
[urcu.git] / 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 *
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 <sys/syscall.h>
33#include <arch.h>
34
35/* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
36#define CACHE_LINE_SIZE 4096
37
38#if defined(_syscall0)
39_syscall0(pid_t, gettid)
40#elif defined(__NR_gettid)
41static inline pid_t gettid(void)
42{
43 return syscall(__NR_gettid);
44}
45#else
46#warning "use pid as tid"
47static inline pid_t gettid(void)
48{
49 return getpid();
50}
51#endif
52
53#define _LGPL_SOURCE
54#include "urcu.h"
55
56pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
57
58void rcu_copy_mutex_lock(void)
59{
60 int ret;
61 ret = pthread_mutex_lock(&rcu_copy_mutex);
62 if (ret) {
63 perror("Error in pthread mutex lock");
64 exit(-1);
65 }
66}
67
68void rcu_copy_mutex_unlock(void)
69{
70 int ret;
71
72 ret = pthread_mutex_unlock(&rcu_copy_mutex);
73 if (ret) {
74 perror("Error in pthread mutex unlock");
75 exit(-1);
76 }
77}
78
79struct test_array {
80 int a;
81};
82
83static struct test_array *test_rcu_pointer;
84
85#define OUTER_READ_LOOP 2000U
86#define INNER_READ_LOOP 100000U
87#define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
88
89#define OUTER_WRITE_LOOP 10U
90#define INNER_WRITE_LOOP 200U
91#define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
92
93static int num_read;
94static int num_write;
95
96#define NR_READ num_read
97#define NR_WRITE num_write
98
99static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time;
100static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time;
101
102void *thr_reader(void *arg)
103{
104 int i, j;
105 struct test_array *local_ptr;
106 cycles_t time1, time2;
107
108 printf("thread_begin %s, thread id : %lx, tid %lu\n",
109 "reader", pthread_self(), (unsigned long)gettid());
110 sleep(2);
111
112 rcu_register_thread();
113
114 time1 = get_cycles();
115 for (i = 0; i < OUTER_READ_LOOP; i++) {
116 for (j = 0; j < INNER_READ_LOOP; j++) {
117 rcu_read_lock();
118 local_ptr = rcu_dereference(test_rcu_pointer);
119 if (local_ptr) {
120 assert(local_ptr->a == 8);
121 }
122 rcu_read_unlock();
123 }
124 }
125 time2 = get_cycles();
126
127 rcu_unregister_thread();
128
129 reader_time[(unsigned long)arg] = time2 - time1;
130
131 sleep(2);
132 printf("thread_end %s, thread id : %lx, tid %lu\n",
133 "reader", pthread_self(), (unsigned long)gettid());
134 return ((void*)1);
135
136}
137
138void *thr_writer(void *arg)
139{
140 int i, j;
141 struct test_array *new, *old;
142 cycles_t time1, time2;
143
144 printf("thread_begin %s, thread id : %lx, tid %lu\n",
145 "writer", pthread_self(), (unsigned long)gettid());
146 sleep(2);
147
148 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
149 for (j = 0; j < INNER_WRITE_LOOP; j++) {
150 time1 = get_cycles();
151 new = malloc(sizeof(struct test_array));
152 rcu_copy_mutex_lock();
153 old = test_rcu_pointer;
154 if (old) {
155 assert(old->a == 8);
156 }
157 new->a = 8;
158 old = rcu_publish_content(&test_rcu_pointer, new);
159 rcu_copy_mutex_unlock();
160 /* can be done after unlock */
161 if (old) {
162 old->a = 0;
163 }
164 free(old);
165 time2 = get_cycles();
166 writer_time[(unsigned long)arg] += time2 - time1;
167 usleep(1);
168 }
169 }
170
171 printf("thread_end %s, thread id : %lx, tid %lu\n",
172 "writer", pthread_self(), (unsigned long)gettid());
173 return ((void*)2);
174}
175
176int main(int argc, char **argv)
177{
178 int err;
179 pthread_t *tid_reader, *tid_writer;
180 void *tret;
181 int i;
182 cycles_t tot_rtime = 0;
183 cycles_t tot_wtime = 0;
184
185 if (argc < 2) {
186 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
187 exit(-1);
188 }
189 num_read = atoi(argv[1]);
190 num_write = atoi(argv[2]);
191
192 reader_time = malloc(sizeof(*reader_time) * num_read);
193 writer_time = malloc(sizeof(*writer_time) * num_write);
194 tid_reader = malloc(sizeof(*tid_reader) * num_read);
195 tid_writer = malloc(sizeof(*tid_writer) * num_write);
196
197 printf("thread %-6s, thread id : %lx, tid %lu\n",
198 "main", pthread_self(), (unsigned long)gettid());
199
200 for (i = 0; i < NR_READ; i++) {
201 err = pthread_create(&tid_reader[i], NULL, thr_reader,
202 (void *)(long)i);
203 if (err != 0)
204 exit(1);
205 }
206 for (i = 0; i < NR_WRITE; i++) {
207 err = pthread_create(&tid_writer[i], NULL, thr_writer,
208 (void *)(long)i);
209 if (err != 0)
210 exit(1);
211 }
212
213 sleep(10);
214
215 for (i = 0; i < NR_READ; i++) {
216 err = pthread_join(tid_reader[i], &tret);
217 if (err != 0)
218 exit(1);
219 tot_rtime += reader_time[i];
220 }
221 for (i = 0; i < NR_WRITE; i++) {
222 err = pthread_join(tid_writer[i], &tret);
223 if (err != 0)
224 exit(1);
225 tot_wtime += writer_time[i];
226 }
227 free(test_rcu_pointer);
228 printf("Time per read : %g cycles\n",
229 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
230 printf("Time per write : %g cycles\n",
231 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
232
233 free(reader_time);
234 free(writer_time);
235 free(tid_reader);
236 free(tid_writer);
237
238 return 0;
239}
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