fix: shadowed local variable (-Wshadow)
[urcu.git] / tests / benchmark / test_urcu_timing.c
CommitLineData
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1/*
2 * test_urcu.c
3 *
4 * Userspace RCU library - test program
5 *
6982d6d7 6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
20bf310a 7 *
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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.
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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>
94b343fd 32#include <errno.h>
ec4e58a3 33#include <urcu/arch.h>
20bf310a 34
94df6318 35#include "thread-id.h"
20bf310a 36
121a5d44 37#define _LGPL_SOURCE
ec4e58a3 38#include <urcu.h>
20bf310a 39
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40pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
41
61c3fb60 42static
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43void 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
61c3fb60 53static
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54void 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
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65struct test_array {
66 int a;
67};
68
69static 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
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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)
20bf310a 78
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79static int num_read;
80static int num_write;
20bf310a 81
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82#define NR_READ num_read
83#define NR_WRITE num_write
84
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85static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time;
86static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time;
20bf310a 87
61c3fb60 88static
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89void *thr_reader(void *arg)
90{
83e334d0 91 unsigned int i, j;
20bf310a 92 struct test_array *local_ptr;
3fa18286 93 caa_cycles_t time1, time2;
20bf310a 94
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95 printf("thread_begin %s, tid %lu\n",
96 "reader", urcu_get_thread_id());
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97 sleep(2);
98
121a5d44 99 rcu_register_thread();
20bf310a 100
06f22bdb 101 time1 = caa_get_cycles();
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102 for (i = 0; i < OUTER_READ_LOOP; i++) {
103 for (j = 0; j < INNER_READ_LOOP; j++) {
1430ee0b 104 rcu_read_lock();
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105 local_ptr = rcu_dereference(test_rcu_pointer);
106 if (local_ptr) {
107 assert(local_ptr->a == 8);
108 }
1430ee0b 109 rcu_read_unlock();
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110 }
111 }
06f22bdb 112 time2 = caa_get_cycles();
20bf310a 113
121a5d44 114 rcu_unregister_thread();
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115
116 reader_time[(unsigned long)arg] = time2 - time1;
117
118 sleep(2);
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119 printf("thread_end %s, tid %lu\n",
120 "reader", urcu_get_thread_id());
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121 return ((void*)1);
122
123}
124
61c3fb60 125static
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126void *thr_writer(void *arg)
127{
83e334d0 128 unsigned int i, j;
20bf310a 129 struct test_array *new, *old;
3fa18286 130 caa_cycles_t time1, time2;
20bf310a 131
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132 printf("thread_begin %s, tid %lu\n",
133 "writer", urcu_get_thread_id());
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134 sleep(2);
135
102d1d23 136 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
102d1d23 137 for (j = 0; j < INNER_WRITE_LOOP; j++) {
06f22bdb 138 time1 = caa_get_cycles();
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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;
d2835e6f 146 old = rcu_xchg_pointer(&test_rcu_pointer, new);
102d1d23 147 rcu_copy_mutex_unlock();
d2835e6f 148 synchronize_rcu();
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149 /* can be done after unlock */
150 if (old) {
151 old->a = 0;
152 }
153 free(old);
06f22bdb 154 time2 = caa_get_cycles();
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155 writer_time[(unsigned long)arg] += time2 - time1;
156 usleep(1);
20bf310a 157 }
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158 }
159
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160 printf("thread_end %s, tid %lu\n",
161 "writer", urcu_get_thread_id());
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162 return ((void*)2);
163}
164
2c9689fe 165int main(int argc, char **argv)
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166{
167 int err;
2c9689fe 168 pthread_t *tid_reader, *tid_writer;
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169 void *tret;
170 int i;
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171 caa_cycles_t tot_rtime = 0;
172 caa_cycles_t tot_wtime = 0;
20bf310a 173
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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
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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));
2c9689fe 185
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186 printf("thread %-6s, tid %lu\n",
187 "main", urcu_get_thread_id());
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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++) {
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196 err = pthread_create(&tid_writer[i], NULL, thr_writer,
197 (void *)(long)i);
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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);
102d1d23 208 tot_rtime += reader_time[i];
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209 }
210 for (i = 0; i < NR_WRITE; i++) {
211 err = pthread_join(tid_writer[i], &tret);
212 if (err != 0)
213 exit(1);
102d1d23 214 tot_wtime += writer_time[i];
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215 }
216 free(test_rcu_pointer);
217 printf("Time per read : %g cycles\n",
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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));
20bf310a 221
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222 free(reader_time);
223 free(writer_time);
224 free(tid_reader);
225 free(tid_writer);
226
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227 return 0;
228}
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