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420e5b92 MD |
1 | /* |
2 | * test_qsbr_timing.c | |
3 | * | |
4 | * Userspace QSBR - test program | |
5 | * | |
6982d6d7 | 6 | * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
420e5b92 MD |
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> | |
94b343fd PM |
32 | #include <errno.h> |
33 | ||
ec4e58a3 | 34 | #include <urcu/arch.h> |
420e5b92 | 35 | |
65fcc7e9 MD |
36 | #ifdef __linux__ |
37 | #include <syscall.h> | |
38 | #endif | |
39 | ||
420e5b92 MD |
40 | #if defined(_syscall0) |
41 | _syscall0(pid_t, gettid) | |
42 | #elif defined(__NR_gettid) | |
43 | static inline pid_t gettid(void) | |
44 | { | |
45 | return syscall(__NR_gettid); | |
46 | } | |
47 | #else | |
48 | #warning "use pid as tid" | |
49 | static inline pid_t gettid(void) | |
50 | { | |
51 | return getpid(); | |
52 | } | |
53 | #endif | |
54 | ||
55 | #define _LGPL_SOURCE | |
ec4e58a3 | 56 | #include <urcu-qsbr.h> |
420e5b92 MD |
57 | |
58 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; | |
59 | ||
60 | void rcu_copy_mutex_lock(void) | |
61 | { | |
62 | int ret; | |
63 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
64 | if (ret) { | |
65 | perror("Error in pthread mutex lock"); | |
66 | exit(-1); | |
67 | } | |
68 | } | |
69 | ||
70 | void rcu_copy_mutex_unlock(void) | |
71 | { | |
72 | int ret; | |
73 | ||
74 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
75 | if (ret) { | |
76 | perror("Error in pthread mutex unlock"); | |
77 | exit(-1); | |
78 | } | |
79 | } | |
80 | ||
81 | struct test_array { | |
82 | int a; | |
83 | }; | |
84 | ||
85 | static struct test_array *test_rcu_pointer; | |
86 | ||
87 | #define OUTER_READ_LOOP 2000U | |
88 | #define INNER_READ_LOOP 100000U | |
89 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
90 | ||
91 | #define OUTER_WRITE_LOOP 10U | |
92 | #define INNER_WRITE_LOOP 200U | |
93 | #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP) | |
94 | ||
2c9689fe MD |
95 | static int num_read; |
96 | static int num_write; | |
420e5b92 | 97 | |
2c9689fe MD |
98 | #define NR_READ num_read |
99 | #define NR_WRITE num_write | |
100 | ||
06f22bdb DG |
101 | static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time; |
102 | static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time; | |
420e5b92 MD |
103 | |
104 | void *thr_reader(void *arg) | |
105 | { | |
106 | int i, j; | |
107 | struct test_array *local_ptr; | |
108 | cycles_t time1, time2; | |
109 | ||
110 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
111 | "reader", pthread_self(), (unsigned long)gettid()); | |
112 | sleep(2); | |
113 | ||
114 | rcu_register_thread(); | |
115 | ||
06f22bdb | 116 | time1 = caa_get_cycles(); |
420e5b92 MD |
117 | for (i = 0; i < OUTER_READ_LOOP; i++) { |
118 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
119 | _rcu_read_lock(); | |
120 | local_ptr = _rcu_dereference(test_rcu_pointer); | |
121 | if (local_ptr) { | |
122 | assert(local_ptr->a == 8); | |
123 | } | |
124 | _rcu_read_unlock(); | |
125 | } | |
126 | _rcu_quiescent_state(); | |
127 | } | |
06f22bdb | 128 | time2 = caa_get_cycles(); |
420e5b92 MD |
129 | |
130 | rcu_unregister_thread(); | |
131 | ||
132 | reader_time[(unsigned long)arg] = time2 - time1; | |
133 | ||
134 | sleep(2); | |
135 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
136 | "reader", pthread_self(), (unsigned long)gettid()); | |
137 | return ((void*)1); | |
138 | ||
139 | } | |
140 | ||
141 | void *thr_writer(void *arg) | |
142 | { | |
143 | int i, j; | |
144 | struct test_array *new, *old; | |
145 | cycles_t time1, time2; | |
146 | ||
147 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
148 | "writer", pthread_self(), (unsigned long)gettid()); | |
149 | sleep(2); | |
150 | ||
151 | for (i = 0; i < OUTER_WRITE_LOOP; i++) { | |
152 | for (j = 0; j < INNER_WRITE_LOOP; j++) { | |
06f22bdb | 153 | time1 = caa_get_cycles(); |
420e5b92 MD |
154 | new = malloc(sizeof(struct test_array)); |
155 | rcu_copy_mutex_lock(); | |
156 | old = test_rcu_pointer; | |
157 | if (old) { | |
158 | assert(old->a == 8); | |
159 | } | |
160 | new->a = 8; | |
d2835e6f | 161 | old = rcu_xchg_pointer(&test_rcu_pointer, new); |
420e5b92 | 162 | rcu_copy_mutex_unlock(); |
d2835e6f | 163 | synchronize_rcu(); |
420e5b92 MD |
164 | /* can be done after unlock */ |
165 | if (old) { | |
166 | old->a = 0; | |
167 | } | |
168 | free(old); | |
06f22bdb | 169 | time2 = caa_get_cycles(); |
420e5b92 MD |
170 | writer_time[(unsigned long)arg] += time2 - time1; |
171 | usleep(1); | |
172 | } | |
173 | } | |
174 | ||
175 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
176 | "writer", pthread_self(), (unsigned long)gettid()); | |
177 | return ((void*)2); | |
178 | } | |
179 | ||
2c9689fe | 180 | int main(int argc, char **argv) |
420e5b92 MD |
181 | { |
182 | int err; | |
2c9689fe | 183 | pthread_t *tid_reader, *tid_writer; |
420e5b92 MD |
184 | void *tret; |
185 | int i; | |
186 | cycles_t tot_rtime = 0; | |
187 | cycles_t tot_wtime = 0; | |
188 | ||
2c9689fe MD |
189 | if (argc < 2) { |
190 | printf("Usage : %s nr_readers nr_writers\n", argv[0]); | |
191 | exit(-1); | |
192 | } | |
193 | num_read = atoi(argv[1]); | |
194 | num_write = atoi(argv[2]); | |
195 | ||
196 | reader_time = malloc(sizeof(*reader_time) * num_read); | |
197 | writer_time = malloc(sizeof(*writer_time) * num_write); | |
198 | tid_reader = malloc(sizeof(*tid_reader) * num_read); | |
199 | tid_writer = malloc(sizeof(*tid_writer) * num_write); | |
200 | ||
420e5b92 MD |
201 | printf("thread %-6s, thread id : %lx, tid %lu\n", |
202 | "main", pthread_self(), (unsigned long)gettid()); | |
203 | ||
204 | for (i = 0; i < NR_READ; i++) { | |
205 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
206 | (void *)(long)i); | |
207 | if (err != 0) | |
208 | exit(1); | |
209 | } | |
210 | for (i = 0; i < NR_WRITE; i++) { | |
211 | err = pthread_create(&tid_writer[i], NULL, thr_writer, | |
212 | (void *)(long)i); | |
213 | if (err != 0) | |
214 | exit(1); | |
215 | } | |
216 | ||
217 | sleep(10); | |
218 | ||
219 | for (i = 0; i < NR_READ; i++) { | |
220 | err = pthread_join(tid_reader[i], &tret); | |
221 | if (err != 0) | |
222 | exit(1); | |
223 | tot_rtime += reader_time[i]; | |
224 | } | |
225 | for (i = 0; i < NR_WRITE; i++) { | |
226 | err = pthread_join(tid_writer[i], &tret); | |
227 | if (err != 0) | |
228 | exit(1); | |
229 | tot_wtime += writer_time[i]; | |
230 | } | |
231 | free(test_rcu_pointer); | |
232 | printf("Time per read : %g cycles\n", | |
233 | (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP)); | |
234 | printf("Time per write : %g cycles\n", | |
235 | (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP)); | |
236 | ||
2c9689fe MD |
237 | free(reader_time); |
238 | free(writer_time); | |
239 | free(tid_reader); | |
240 | free(tid_writer); | |
241 | ||
420e5b92 MD |
242 | return 0; |
243 | } |