Add QSBR RCU timing tests
[urcu.git] / test_qsbr_timing.c
1 /*
2 * test_qsbr_timing.c
3 *
4 * Userspace QSBR - test program
5 *
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
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 <sys/syscall.h>
33 #include <arch.h>
34
35 #if defined(_syscall0)
36 _syscall0(pid_t, gettid)
37 #elif defined(__NR_gettid)
38 static inline pid_t gettid(void)
39 {
40 return syscall(__NR_gettid);
41 }
42 #else
43 #warning "use pid as tid"
44 static inline pid_t gettid(void)
45 {
46 return getpid();
47 }
48 #endif
49
50 #define _LGPL_SOURCE
51 #include "urcu-qsbr.h"
52
53 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
54
55 void rcu_copy_mutex_lock(void)
56 {
57 int ret;
58 ret = pthread_mutex_lock(&rcu_copy_mutex);
59 if (ret) {
60 perror("Error in pthread mutex lock");
61 exit(-1);
62 }
63 }
64
65 void rcu_copy_mutex_unlock(void)
66 {
67 int ret;
68
69 ret = pthread_mutex_unlock(&rcu_copy_mutex);
70 if (ret) {
71 perror("Error in pthread mutex unlock");
72 exit(-1);
73 }
74 }
75
76 struct test_array {
77 int a;
78 };
79
80 static struct test_array *test_rcu_pointer;
81
82 #define OUTER_READ_LOOP 2000U
83 #define INNER_READ_LOOP 100000U
84 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
85
86 #define OUTER_WRITE_LOOP 10U
87 #define INNER_WRITE_LOOP 200U
88 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
89
90 #define NR_READ 10
91 #define NR_WRITE 9
92
93 static cycles_t reader_time[NR_READ] __attribute__((aligned(128)));
94 static cycles_t writer_time[NR_WRITE] __attribute__((aligned(128)));
95
96 void *thr_reader(void *arg)
97 {
98 int i, j;
99 struct test_array *local_ptr;
100 cycles_t time1, time2;
101
102 printf("thread_begin %s, thread id : %lx, tid %lu\n",
103 "reader", pthread_self(), (unsigned long)gettid());
104 sleep(2);
105
106 rcu_register_thread();
107
108 time1 = get_cycles();
109 for (i = 0; i < OUTER_READ_LOOP; i++) {
110 for (j = 0; j < INNER_READ_LOOP; j++) {
111 _rcu_read_lock();
112 local_ptr = _rcu_dereference(test_rcu_pointer);
113 if (local_ptr) {
114 assert(local_ptr->a == 8);
115 }
116 _rcu_read_unlock();
117 }
118 _rcu_quiescent_state();
119 }
120 time2 = get_cycles();
121
122 rcu_unregister_thread();
123
124 reader_time[(unsigned long)arg] = time2 - time1;
125
126 sleep(2);
127 printf("thread_end %s, thread id : %lx, tid %lu\n",
128 "reader", pthread_self(), (unsigned long)gettid());
129 return ((void*)1);
130
131 }
132
133 void *thr_writer(void *arg)
134 {
135 int i, j;
136 struct test_array *new, *old;
137 cycles_t time1, time2;
138
139 printf("thread_begin %s, thread id : %lx, tid %lu\n",
140 "writer", pthread_self(), (unsigned long)gettid());
141 sleep(2);
142
143 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
144 for (j = 0; j < INNER_WRITE_LOOP; j++) {
145 time1 = get_cycles();
146 new = malloc(sizeof(struct test_array));
147 rcu_copy_mutex_lock();
148 old = test_rcu_pointer;
149 if (old) {
150 assert(old->a == 8);
151 }
152 new->a = 8;
153 old = _rcu_publish_content(&test_rcu_pointer, new);
154 rcu_copy_mutex_unlock();
155 /* can be done after unlock */
156 if (old) {
157 old->a = 0;
158 }
159 free(old);
160 time2 = get_cycles();
161 writer_time[(unsigned long)arg] += time2 - time1;
162 usleep(1);
163 }
164 }
165
166 printf("thread_end %s, thread id : %lx, tid %lu\n",
167 "writer", pthread_self(), (unsigned long)gettid());
168 return ((void*)2);
169 }
170
171 int main()
172 {
173 int err;
174 pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE];
175 void *tret;
176 int i;
177 cycles_t tot_rtime = 0;
178 cycles_t tot_wtime = 0;
179
180 printf("thread %-6s, thread id : %lx, tid %lu\n",
181 "main", pthread_self(), (unsigned long)gettid());
182
183 for (i = 0; i < NR_READ; i++) {
184 err = pthread_create(&tid_reader[i], NULL, thr_reader,
185 (void *)(long)i);
186 if (err != 0)
187 exit(1);
188 }
189 for (i = 0; i < NR_WRITE; i++) {
190 err = pthread_create(&tid_writer[i], NULL, thr_writer,
191 (void *)(long)i);
192 if (err != 0)
193 exit(1);
194 }
195
196 sleep(10);
197
198 for (i = 0; i < NR_READ; i++) {
199 err = pthread_join(tid_reader[i], &tret);
200 if (err != 0)
201 exit(1);
202 tot_rtime += reader_time[i];
203 }
204 for (i = 0; i < NR_WRITE; i++) {
205 err = pthread_join(tid_writer[i], &tret);
206 if (err != 0)
207 exit(1);
208 tot_wtime += writer_time[i];
209 }
210 free(test_rcu_pointer);
211 printf("Time per read : %g cycles\n",
212 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
213 printf("Time per write : %g cycles\n",
214 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
215
216 return 0;
217 }
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