Documentation: rculfhash: cds_lfht_resize not within read-side C.S.
[urcu.git] / tests / test_urcu_timing.c
1 /*
2 * test_urcu.c
3 *
4 * Userspace RCU library - test program
5 *
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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 <errno.h>
33 #include <urcu/arch.h>
34
35 #ifdef __linux__
36 #include <syscall.h>
37 #endif
38
39 #if defined(_syscall0)
40 _syscall0(pid_t, gettid)
41 #elif defined(__NR_gettid)
42 static inline pid_t gettid(void)
43 {
44 return syscall(__NR_gettid);
45 }
46 #else
47 #warning "use pid as tid"
48 static inline pid_t gettid(void)
49 {
50 return getpid();
51 }
52 #endif
53
54 #define _LGPL_SOURCE
55 #include <urcu.h>
56
57 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
58
59 void 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
69 void 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
80 struct test_array {
81 int a;
82 };
83
84 static 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
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)
93
94 static int num_read;
95 static int num_write;
96
97 #define NR_READ num_read
98 #define NR_WRITE num_write
99
100 static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time;
101 static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time;
102
103 void *thr_reader(void *arg)
104 {
105 int i, j;
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", (unsigned long) pthread_self(),
111 (unsigned long) gettid());
112 sleep(2);
113
114 rcu_register_thread();
115
116 time1 = caa_get_cycles();
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 }
127 time2 = caa_get_cycles();
128
129 rcu_unregister_thread();
130
131 reader_time[(unsigned long)arg] = time2 - time1;
132
133 sleep(2);
134 printf("thread_end %s, thread id : %lx, tid %lu\n",
135 "reader", (unsigned long) pthread_self(),
136 (unsigned long) gettid());
137 return ((void*)1);
138
139 }
140
141 void *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", (unsigned long) pthread_self(),
149 (unsigned long) gettid());
150 sleep(2);
151
152 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
153 for (j = 0; j < INNER_WRITE_LOOP; j++) {
154 time1 = caa_get_cycles();
155 new = malloc(sizeof(struct test_array));
156 rcu_copy_mutex_lock();
157 old = test_rcu_pointer;
158 if (old) {
159 assert(old->a == 8);
160 }
161 new->a = 8;
162 old = rcu_xchg_pointer(&test_rcu_pointer, new);
163 rcu_copy_mutex_unlock();
164 synchronize_rcu();
165 /* can be done after unlock */
166 if (old) {
167 old->a = 0;
168 }
169 free(old);
170 time2 = caa_get_cycles();
171 writer_time[(unsigned long)arg] += time2 - time1;
172 usleep(1);
173 }
174 }
175
176 printf("thread_end %s, thread id : %lx, tid %lu\n",
177 "writer", (unsigned long) pthread_self(),
178 (unsigned long) gettid());
179 return ((void*)2);
180 }
181
182 int main(int argc, char **argv)
183 {
184 int err;
185 pthread_t *tid_reader, *tid_writer;
186 void *tret;
187 int i;
188 cycles_t tot_rtime = 0;
189 cycles_t tot_wtime = 0;
190
191 if (argc < 2) {
192 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
193 exit(-1);
194 }
195 num_read = atoi(argv[1]);
196 num_write = atoi(argv[2]);
197
198 reader_time = malloc(sizeof(*reader_time) * num_read);
199 writer_time = malloc(sizeof(*writer_time) * num_write);
200 tid_reader = malloc(sizeof(*tid_reader) * num_read);
201 tid_writer = malloc(sizeof(*tid_writer) * num_write);
202
203 printf("thread %-6s, thread id : %lx, tid %lu\n",
204 "main", (unsigned long) pthread_self(),
205 (unsigned long) gettid());
206
207 for (i = 0; i < NR_READ; i++) {
208 err = pthread_create(&tid_reader[i], NULL, thr_reader,
209 (void *)(long)i);
210 if (err != 0)
211 exit(1);
212 }
213 for (i = 0; i < NR_WRITE; i++) {
214 err = pthread_create(&tid_writer[i], NULL, thr_writer,
215 (void *)(long)i);
216 if (err != 0)
217 exit(1);
218 }
219
220 sleep(10);
221
222 for (i = 0; i < NR_READ; i++) {
223 err = pthread_join(tid_reader[i], &tret);
224 if (err != 0)
225 exit(1);
226 tot_rtime += reader_time[i];
227 }
228 for (i = 0; i < NR_WRITE; i++) {
229 err = pthread_join(tid_writer[i], &tret);
230 if (err != 0)
231 exit(1);
232 tot_wtime += writer_time[i];
233 }
234 free(test_rcu_pointer);
235 printf("Time per read : %g cycles\n",
236 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
237 printf("Time per write : %g cycles\n",
238 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
239
240 free(reader_time);
241 free(writer_time);
242 free(tid_reader);
243 free(tid_writer);
244
245 return 0;
246 }
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