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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 | } |