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de10a585 MD |
1 | /* |
2 | * test_qsbr_timing.c | |
3 | * | |
4 | * Userspace QSBR - test program | |
5 | * | |
6 | * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
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 <errno.h> | |
33 | ||
34 | #include <urcu/arch.h> | |
94df6318 | 35 | #include "thread-id.h" |
de10a585 MD |
36 | |
37 | #define _LGPL_SOURCE | |
38 | #include <urcu-qsbr.h> | |
39 | ||
40 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
41 | ||
42 | void rcu_copy_mutex_lock(void) | |
43 | { | |
44 | int ret; | |
45 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
46 | if (ret) { | |
47 | perror("Error in pthread mutex lock"); | |
48 | exit(-1); | |
49 | } | |
50 | } | |
51 | ||
52 | void rcu_copy_mutex_unlock(void) | |
53 | { | |
54 | int ret; | |
55 | ||
56 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
57 | if (ret) { | |
58 | perror("Error in pthread mutex unlock"); | |
59 | exit(-1); | |
60 | } | |
61 | } | |
62 | ||
63 | struct test_array { | |
64 | int a; | |
65 | }; | |
66 | ||
67 | static struct test_array *test_rcu_pointer; | |
68 | ||
69 | #define OUTER_READ_LOOP 2000U | |
70 | #define INNER_READ_LOOP 100000U | |
71 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
72 | ||
73 | #define OUTER_WRITE_LOOP 10U | |
74 | #define INNER_WRITE_LOOP 200U | |
75 | #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP) | |
76 | ||
77 | static int num_read; | |
78 | static int num_write; | |
79 | ||
80 | #define NR_READ num_read | |
81 | #define NR_WRITE num_write | |
82 | ||
3fa18286 MD |
83 | static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time; |
84 | static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time; | |
de10a585 MD |
85 | |
86 | void *thr_reader(void *arg) | |
87 | { | |
88 | int i, j; | |
89 | struct test_array *local_ptr; | |
3fa18286 | 90 | caa_cycles_t time1, time2; |
de10a585 | 91 | |
94df6318 MD |
92 | printf("thread_begin %s, tid %lu\n", |
93 | "reader", urcu_get_thread_id()); | |
de10a585 MD |
94 | sleep(2); |
95 | ||
96 | rcu_register_thread(); | |
97 | ||
98 | time1 = caa_get_cycles(); | |
99 | for (i = 0; i < OUTER_READ_LOOP; i++) { | |
100 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
101 | _rcu_read_lock(); | |
102 | local_ptr = _rcu_dereference(test_rcu_pointer); | |
103 | if (local_ptr) { | |
104 | assert(local_ptr->a == 8); | |
105 | } | |
106 | _rcu_read_unlock(); | |
107 | } | |
108 | _rcu_quiescent_state(); | |
109 | } | |
110 | time2 = caa_get_cycles(); | |
111 | ||
112 | rcu_unregister_thread(); | |
113 | ||
114 | reader_time[(unsigned long)arg] = time2 - time1; | |
115 | ||
116 | sleep(2); | |
94df6318 MD |
117 | printf("thread_end %s, tid %lu\n", |
118 | "reader", urcu_get_thread_id()); | |
de10a585 MD |
119 | return ((void*)1); |
120 | ||
121 | } | |
122 | ||
123 | void *thr_writer(void *arg) | |
124 | { | |
125 | int i, j; | |
126 | struct test_array *new, *old; | |
3fa18286 | 127 | caa_cycles_t time1, time2; |
de10a585 | 128 | |
94df6318 MD |
129 | printf("thread_begin %s, tid %lu\n", |
130 | "writer", urcu_get_thread_id()); | |
de10a585 MD |
131 | sleep(2); |
132 | ||
133 | for (i = 0; i < OUTER_WRITE_LOOP; i++) { | |
134 | for (j = 0; j < INNER_WRITE_LOOP; j++) { | |
135 | time1 = caa_get_cycles(); | |
136 | new = malloc(sizeof(struct test_array)); | |
137 | rcu_copy_mutex_lock(); | |
138 | old = test_rcu_pointer; | |
139 | if (old) { | |
140 | assert(old->a == 8); | |
141 | } | |
142 | new->a = 8; | |
143 | old = rcu_xchg_pointer(&test_rcu_pointer, new); | |
144 | rcu_copy_mutex_unlock(); | |
145 | synchronize_rcu(); | |
146 | /* can be done after unlock */ | |
147 | if (old) { | |
148 | old->a = 0; | |
149 | } | |
150 | free(old); | |
151 | time2 = caa_get_cycles(); | |
152 | writer_time[(unsigned long)arg] += time2 - time1; | |
153 | usleep(1); | |
154 | } | |
155 | } | |
156 | ||
94df6318 MD |
157 | printf("thread_end %s, tid %lu\n", |
158 | "writer", urcu_get_thread_id()); | |
de10a585 MD |
159 | return ((void*)2); |
160 | } | |
161 | ||
162 | int main(int argc, char **argv) | |
163 | { | |
164 | int err; | |
165 | pthread_t *tid_reader, *tid_writer; | |
166 | void *tret; | |
167 | int i; | |
3fa18286 MD |
168 | caa_cycles_t tot_rtime = 0; |
169 | caa_cycles_t tot_wtime = 0; | |
de10a585 MD |
170 | |
171 | if (argc < 2) { | |
172 | printf("Usage : %s nr_readers nr_writers\n", argv[0]); | |
173 | exit(-1); | |
174 | } | |
175 | num_read = atoi(argv[1]); | |
176 | num_write = atoi(argv[2]); | |
177 | ||
9aa14175 MD |
178 | reader_time = calloc(num_read, sizeof(*reader_time)); |
179 | writer_time = calloc(num_write, sizeof(*writer_time)); | |
180 | tid_reader = calloc(num_read, sizeof(*tid_reader)); | |
181 | tid_writer = calloc(num_write, sizeof(*tid_writer)); | |
de10a585 | 182 | |
94df6318 MD |
183 | printf("thread %-6s, tid %lu\n", |
184 | "main", urcu_get_thread_id()); | |
de10a585 MD |
185 | |
186 | for (i = 0; i < NR_READ; i++) { | |
187 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
188 | (void *)(long)i); | |
189 | if (err != 0) | |
190 | exit(1); | |
191 | } | |
192 | for (i = 0; i < NR_WRITE; i++) { | |
193 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
194 | (void *)(long)i); | |
195 | if (err != 0) | |
196 | exit(1); | |
197 | } | |
198 | ||
199 | sleep(10); | |
200 | ||
201 | for (i = 0; i < NR_READ; i++) { | |
202 | err = pthread_join(tid_reader[i], &tret); | |
203 | if (err != 0) | |
204 | exit(1); | |
205 | tot_rtime += reader_time[i]; | |
206 | } | |
207 | for (i = 0; i < NR_WRITE; i++) { | |
208 | err = pthread_join(tid_writer[i], &tret); | |
209 | if (err != 0) | |
210 | exit(1); | |
211 | tot_wtime += writer_time[i]; | |
212 | } | |
213 | free(test_rcu_pointer); | |
214 | printf("Time per read : %g cycles\n", | |
215 | (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP)); | |
216 | printf("Time per write : %g cycles\n", | |
217 | (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP)); | |
218 | ||
219 | free(reader_time); | |
220 | free(writer_time); | |
221 | free(tid_reader); | |
222 | free(tid_writer); | |
223 | ||
224 | return 0; | |
225 | } |