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