5369796759bfa950108117c5d4a864ca6aa06721
[urcu.git] / test_perthreadlock_timing.c
1 /*
2 * test_perthreadloc_timing.c
3 *
4 * Per thread locks - 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 <pthread.h>
34 #include <arch.h>
35
36 #if defined(_syscall0)
37 _syscall0(pid_t, gettid)
38 #elif defined(__NR_gettid)
39 static inline pid_t gettid(void)
40 {
41 return syscall(__NR_gettid);
42 }
43 #else
44 #warning "use pid as tid"
45 static inline pid_t gettid(void)
46 {
47 return getpid();
48 }
49 #endif
50
51 #include "urcu.h"
52
53 struct test_array {
54 int a;
55 };
56
57 static struct test_array test_array = { 8 };
58
59 struct per_thread_lock {
60 pthread_mutex_t lock;
61 } __attribute__((aligned(128))); /* cache-line aligned */
62
63 static struct per_thread_lock *per_thread_lock;
64
65 #define OUTER_READ_LOOP 200U
66 #define INNER_READ_LOOP 100000U
67 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
68
69 #define OUTER_WRITE_LOOP 10U
70 #define INNER_WRITE_LOOP 200U
71 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
72
73 #define NR_READ 10
74 #define NR_WRITE 9
75
76 static cycles_t reader_time[NR_READ] __attribute__((aligned(128)));
77 static cycles_t writer_time[NR_WRITE] __attribute__((aligned(128)));
78
79 void *thr_reader(void *arg)
80 {
81 int i, j;
82 cycles_t time1, time2;
83 long tidx = (long)arg;
84
85 printf("thread_begin %s, thread id : %lx, tid %lu\n",
86 "reader", pthread_self(), (unsigned long)gettid());
87 sleep(2);
88
89 time1 = get_cycles();
90 for (i = 0; i < OUTER_READ_LOOP; i++) {
91 for (j = 0; j < INNER_READ_LOOP; j++) {
92 pthread_mutex_lock(&per_thread_lock[tidx].lock);
93 assert(test_array.a == 8);
94 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
95 }
96 }
97 time2 = get_cycles();
98
99 reader_time[tidx] = time2 - time1;
100
101 sleep(2);
102 printf("thread_end %s, thread id : %lx, tid %lu\n",
103 "reader", pthread_self(), (unsigned long)gettid());
104 return ((void*)1);
105
106 }
107
108 void *thr_writer(void *arg)
109 {
110 int i, j;
111 long tidx;
112 cycles_t time1, time2;
113
114 printf("thread_begin %s, thread id : %lx, tid %lu\n",
115 "writer", pthread_self(), (unsigned long)gettid());
116 sleep(2);
117
118 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
119 for (j = 0; j < INNER_WRITE_LOOP; j++) {
120 time1 = get_cycles();
121 for (tidx = 0; tidx < NR_READ; tidx++) {
122 pthread_mutex_lock(&per_thread_lock[tidx].lock);
123 }
124 test_array.a = 8;
125 for (tidx = NR_READ - 1; tidx >= 0; tidx--) {
126 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
127 }
128 time2 = get_cycles();
129 writer_time[(unsigned long)arg] += time2 - time1;
130 }
131 usleep(1);
132 }
133
134 printf("thread_end %s, thread id : %lx, tid %lu\n",
135 "writer", pthread_self(), (unsigned long)gettid());
136 return ((void*)2);
137 }
138
139 int main()
140 {
141 int err;
142 pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE];
143 void *tret;
144 int i;
145 cycles_t tot_rtime = 0;
146 cycles_t tot_wtime = 0;
147
148 printf("thread %-6s, thread id : %lx, tid %lu\n",
149 "main", pthread_self(), (unsigned long)gettid());
150
151 per_thread_lock = malloc(sizeof(struct per_thread_lock) * NR_READ);
152
153 for (i = 0; i < NR_READ; i++) {
154 pthread_mutex_init(&per_thread_lock[i].lock, NULL);
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++) {
163 err = pthread_create(&tid_writer[i], NULL, thr_writer,
164 (void *)(long)i);
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);
175 tot_rtime += reader_time[i];
176 }
177 for (i = 0; i < NR_WRITE; i++) {
178 err = pthread_join(tid_writer[i], &tret);
179 if (err != 0)
180 exit(1);
181 tot_wtime += writer_time[i];
182 }
183 printf("Time per read : %g cycles\n",
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));
187 free(per_thread_lock);
188
189 return 0;
190 }
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