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