move whether atomic byte/short exists to uatomic_arch_*.h
[urcu.git] / tests / test_rwlock_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 *
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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
d8540fc5 23#define _GNU_SOURCE
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24#include <stdio.h>
25#include <pthread.h>
26#include <stdlib.h>
27#include <string.h>
28#include <sys/types.h>
29#include <sys/wait.h>
30#include <unistd.h>
31#include <stdio.h>
32#include <assert.h>
33#include <sys/syscall.h>
34#include <pthread.h>
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35#include <errno.h>
36
ec4e58a3 37#include <urcu/arch.h>
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38
39#if defined(_syscall0)
40_syscall0(pid_t, gettid)
41#elif defined(__NR_gettid)
42static inline pid_t gettid(void)
43{
44 return syscall(__NR_gettid);
45}
46#else
47#warning "use pid as tid"
48static inline pid_t gettid(void)
49{
50 return getpid();
51}
52#endif
53
ec4e58a3 54#include <urcu.h>
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55
56struct test_array {
57 int a;
58};
59
60pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;
61
62static struct test_array test_array = { 8 };
63
64#define OUTER_READ_LOOP 200U
65#define INNER_READ_LOOP 100000U
66#define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
67
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68#define OUTER_WRITE_LOOP 10U
69#define INNER_WRITE_LOOP 200U
70#define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
20bf310a 71
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72static int num_read;
73static int num_write;
20bf310a 74
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75#define NR_READ num_read
76#define NR_WRITE num_write
77
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78static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time;
79static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time;
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80
81void *thr_reader(void *arg)
82{
83 int i, j;
84 cycles_t time1, time2;
85
86 printf("thread_begin %s, thread id : %lx, tid %lu\n",
87 "reader", pthread_self(), (unsigned long)gettid());
88 sleep(2);
89
90 time1 = get_cycles();
91 for (i = 0; i < OUTER_READ_LOOP; i++) {
92 for (j = 0; j < INNER_READ_LOOP; j++) {
93 pthread_rwlock_rdlock(&lock);
94 assert(test_array.a == 8);
95 pthread_rwlock_unlock(&lock);
96 }
97 }
98 time2 = get_cycles();
99
100 reader_time[(unsigned long)arg] = time2 - time1;
101
102 sleep(2);
103 printf("thread_end %s, thread id : %lx, tid %lu\n",
104 "reader", pthread_self(), (unsigned long)gettid());
105 return ((void*)1);
106
107}
108
109void *thr_writer(void *arg)
110{
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111 int i, j;
112 cycles_t time1, time2;
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113
114 printf("thread_begin %s, thread id : %lx, tid %lu\n",
115 "writer", pthread_self(), (unsigned long)gettid());
116 sleep(2);
117
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118 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
119 for (j = 0; j < INNER_WRITE_LOOP; j++) {
120 time1 = get_cycles();
121 pthread_rwlock_wrlock(&lock);
122 test_array.a = 8;
123 pthread_rwlock_unlock(&lock);
124 time2 = get_cycles();
125 writer_time[(unsigned long)arg] += time2 - time1;
126 usleep(1);
127 }
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128 }
129
130 printf("thread_end %s, thread id : %lx, tid %lu\n",
131 "writer", pthread_self(), (unsigned long)gettid());
132 return ((void*)2);
133}
134
2c9689fe 135int main(int argc, char **argv)
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136{
137 int err;
2c9689fe 138 pthread_t *tid_reader, *tid_writer;
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139 void *tret;
140 int i;
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141 cycles_t tot_rtime = 0;
142 cycles_t tot_wtime = 0;
20bf310a 143
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144 if (argc < 2) {
145 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
146 exit(-1);
147 }
148 num_read = atoi(argv[1]);
149 num_write = atoi(argv[2]);
150
151 reader_time = malloc(sizeof(*reader_time) * num_read);
152 writer_time = malloc(sizeof(*writer_time) * num_write);
153 tid_reader = malloc(sizeof(*tid_reader) * num_read);
154 tid_writer = malloc(sizeof(*tid_writer) * num_write);
155
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156 printf("thread %-6s, thread id : %lx, tid %lu\n",
157 "main", pthread_self(), (unsigned long)gettid());
158
159 for (i = 0; i < NR_READ; i++) {
160 err = pthread_create(&tid_reader[i], NULL, thr_reader,
161 (void *)(long)i);
162 if (err != 0)
163 exit(1);
164 }
165 for (i = 0; i < NR_WRITE; i++) {
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166 err = pthread_create(&tid_writer[i], NULL, thr_writer,
167 (void *)(long)i);
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168 if (err != 0)
169 exit(1);
170 }
171
172 sleep(10);
173
174 for (i = 0; i < NR_READ; i++) {
175 err = pthread_join(tid_reader[i], &tret);
176 if (err != 0)
177 exit(1);
102d1d23 178 tot_rtime += reader_time[i];
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179 }
180 for (i = 0; i < NR_WRITE; i++) {
181 err = pthread_join(tid_writer[i], &tret);
182 if (err != 0)
183 exit(1);
102d1d23 184 tot_wtime += writer_time[i];
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185 }
186 printf("Time per read : %g cycles\n",
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187 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
188 printf("Time per write : %g cycles\n",
189 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
20bf310a 190
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191 free(reader_time);
192 free(writer_time);
193 free(tid_reader);
194 free(tid_writer);
195
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196 return 0;
197}
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