Documentation: rculfhash: cds_lfht_resize not within read-side C.S.
[urcu.git] / tests / test_urcu_qsbr_timing.c
1 /*
2 * test_qsbr_timing.c
3 *
4 * Userspace QSBR - 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
34 #include <urcu/arch.h>
35
36 #ifdef __linux__
37 #include <syscall.h>
38 #endif
39
40 #if defined(_syscall0)
41 _syscall0(pid_t, gettid)
42 #elif defined(__NR_gettid)
43 static inline pid_t gettid(void)
44 {
45 return syscall(__NR_gettid);
46 }
47 #else
48 #warning "use pid as tid"
49 static inline pid_t gettid(void)
50 {
51 return getpid();
52 }
53 #endif
54
55 #define _LGPL_SOURCE
56 #include <urcu-qsbr.h>
57
58 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
59
60 void 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
70 void 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
81 struct test_array {
82 int a;
83 };
84
85 static 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
95 static int num_read;
96 static int num_write;
97
98 #define NR_READ num_read
99 #define NR_WRITE num_write
100
101 static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time;
102 static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time;
103
104 void *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", (unsigned long) pthread_self(),
112 (unsigned long) gettid());
113 sleep(2);
114
115 rcu_register_thread();
116
117 time1 = caa_get_cycles();
118 for (i = 0; i < OUTER_READ_LOOP; i++) {
119 for (j = 0; j < INNER_READ_LOOP; j++) {
120 _rcu_read_lock();
121 local_ptr = _rcu_dereference(test_rcu_pointer);
122 if (local_ptr) {
123 assert(local_ptr->a == 8);
124 }
125 _rcu_read_unlock();
126 }
127 _rcu_quiescent_state();
128 }
129 time2 = caa_get_cycles();
130
131 rcu_unregister_thread();
132
133 reader_time[(unsigned long)arg] = time2 - time1;
134
135 sleep(2);
136 printf("thread_end %s, thread id : %lx, tid %lu\n",
137 "reader", (unsigned long) pthread_self(),
138 (unsigned long) gettid());
139 return ((void*)1);
140
141 }
142
143 void *thr_writer(void *arg)
144 {
145 int i, j;
146 struct test_array *new, *old;
147 cycles_t time1, time2;
148
149 printf("thread_begin %s, thread id : %lx, tid %lu\n",
150 "writer", (unsigned long) pthread_self(),
151 (unsigned long) gettid());
152 sleep(2);
153
154 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
155 for (j = 0; j < INNER_WRITE_LOOP; j++) {
156 time1 = caa_get_cycles();
157 new = malloc(sizeof(struct test_array));
158 rcu_copy_mutex_lock();
159 old = test_rcu_pointer;
160 if (old) {
161 assert(old->a == 8);
162 }
163 new->a = 8;
164 old = rcu_xchg_pointer(&test_rcu_pointer, new);
165 rcu_copy_mutex_unlock();
166 synchronize_rcu();
167 /* can be done after unlock */
168 if (old) {
169 old->a = 0;
170 }
171 free(old);
172 time2 = caa_get_cycles();
173 writer_time[(unsigned long)arg] += time2 - time1;
174 usleep(1);
175 }
176 }
177
178 printf("thread_end %s, thread id : %lx, tid %lu\n",
179 "writer", (unsigned long) pthread_self(),
180 (unsigned long) gettid());
181 return ((void*)2);
182 }
183
184 int main(int argc, char **argv)
185 {
186 int err;
187 pthread_t *tid_reader, *tid_writer;
188 void *tret;
189 int i;
190 cycles_t tot_rtime = 0;
191 cycles_t tot_wtime = 0;
192
193 if (argc < 2) {
194 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
195 exit(-1);
196 }
197 num_read = atoi(argv[1]);
198 num_write = atoi(argv[2]);
199
200 reader_time = malloc(sizeof(*reader_time) * num_read);
201 writer_time = malloc(sizeof(*writer_time) * num_write);
202 tid_reader = malloc(sizeof(*tid_reader) * num_read);
203 tid_writer = malloc(sizeof(*tid_writer) * num_write);
204
205 printf("thread %-6s, thread id : %lx, tid %lu\n",
206 "main", (unsigned long) pthread_self(),
207 (unsigned long) gettid());
208
209 for (i = 0; i < NR_READ; i++) {
210 err = pthread_create(&tid_reader[i], NULL, thr_reader,
211 (void *)(long)i);
212 if (err != 0)
213 exit(1);
214 }
215 for (i = 0; i < NR_WRITE; i++) {
216 err = pthread_create(&tid_writer[i], NULL, thr_writer,
217 (void *)(long)i);
218 if (err != 0)
219 exit(1);
220 }
221
222 sleep(10);
223
224 for (i = 0; i < NR_READ; i++) {
225 err = pthread_join(tid_reader[i], &tret);
226 if (err != 0)
227 exit(1);
228 tot_rtime += reader_time[i];
229 }
230 for (i = 0; i < NR_WRITE; i++) {
231 err = pthread_join(tid_writer[i], &tret);
232 if (err != 0)
233 exit(1);
234 tot_wtime += writer_time[i];
235 }
236 free(test_rcu_pointer);
237 printf("Time per read : %g cycles\n",
238 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
239 printf("Time per write : %g cycles\n",
240 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
241
242 free(reader_time);
243 free(writer_time);
244 free(tid_reader);
245 free(tid_writer);
246
247 return 0;
248 }
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