Update default value for batch size
[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 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
37 #define CACHE_LINE_SIZE 4096
38
39 #if defined(_syscall0)
40 _syscall0(pid_t, gettid)
41 #elif defined(__NR_gettid)
42 static inline pid_t gettid(void)
43 {
44 return syscall(__NR_gettid);
45 }
46 #else
47 #warning "use pid as tid"
48 static inline pid_t gettid(void)
49 {
50 return getpid();
51 }
52 #endif
53
54 #include "urcu.h"
55
56 struct test_array {
57 int a;
58 };
59
60 static struct test_array test_array = { 8 };
61
62 struct per_thread_lock {
63 pthread_mutex_t lock;
64 } __attribute__((aligned(CACHE_LINE_SIZE))); /* cache-line aligned */
65
66 static struct per_thread_lock *per_thread_lock;
67
68 #define OUTER_READ_LOOP 200U
69 #define INNER_READ_LOOP 100000U
70 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
71
72 #define OUTER_WRITE_LOOP 10U
73 #define INNER_WRITE_LOOP 200U
74 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
75
76 static int num_read;
77 static int num_write;
78
79 #define NR_READ num_read
80 #define NR_WRITE num_write
81
82 static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time;
83 static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time;
84
85 void *thr_reader(void *arg)
86 {
87 int i, j;
88 cycles_t time1, time2;
89 long tidx = (long)arg;
90
91 printf("thread_begin %s, thread id : %lx, tid %lu\n",
92 "reader", pthread_self(), (unsigned long)gettid());
93 sleep(2);
94
95 time1 = get_cycles();
96 for (i = 0; i < OUTER_READ_LOOP; i++) {
97 for (j = 0; j < INNER_READ_LOOP; j++) {
98 pthread_mutex_lock(&per_thread_lock[tidx].lock);
99 assert(test_array.a == 8);
100 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
101 }
102 }
103 time2 = get_cycles();
104
105 reader_time[tidx] = time2 - time1;
106
107 sleep(2);
108 printf("thread_end %s, thread id : %lx, tid %lu\n",
109 "reader", pthread_self(), (unsigned long)gettid());
110 return ((void*)1);
111
112 }
113
114 void *thr_writer(void *arg)
115 {
116 int i, j;
117 long tidx;
118 cycles_t time1, time2;
119
120 printf("thread_begin %s, thread id : %lx, tid %lu\n",
121 "writer", pthread_self(), (unsigned long)gettid());
122 sleep(2);
123
124 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
125 for (j = 0; j < INNER_WRITE_LOOP; j++) {
126 time1 = get_cycles();
127 for (tidx = 0; tidx < NR_READ; tidx++) {
128 pthread_mutex_lock(&per_thread_lock[tidx].lock);
129 }
130 test_array.a = 8;
131 for (tidx = NR_READ - 1; tidx >= 0; tidx--) {
132 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
133 }
134 time2 = get_cycles();
135 writer_time[(unsigned long)arg] += time2 - time1;
136 usleep(1);
137 }
138 }
139
140 printf("thread_end %s, thread id : %lx, tid %lu\n",
141 "writer", pthread_self(), (unsigned long)gettid());
142 return ((void*)2);
143 }
144
145 int main(int argc, char **argv)
146 {
147 int err;
148 pthread_t *tid_reader, *tid_writer;
149 void *tret;
150 int i;
151 cycles_t tot_rtime = 0;
152 cycles_t tot_wtime = 0;
153
154 if (argc < 2) {
155 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
156 exit(-1);
157 }
158 num_read = atoi(argv[1]);
159 num_write = atoi(argv[2]);
160
161 reader_time = malloc(sizeof(*reader_time) * num_read);
162 writer_time = malloc(sizeof(*writer_time) * num_write);
163 tid_reader = malloc(sizeof(*tid_reader) * num_read);
164 tid_writer = malloc(sizeof(*tid_writer) * num_write);
165
166 printf("thread %-6s, thread id : %lx, tid %lu\n",
167 "main", pthread_self(), (unsigned long)gettid());
168
169 per_thread_lock = malloc(sizeof(struct per_thread_lock) * NR_READ);
170
171 for (i = 0; i < NR_READ; i++) {
172 pthread_mutex_init(&per_thread_lock[i].lock, NULL);
173 }
174 for (i = 0; i < NR_READ; i++) {
175 err = pthread_create(&tid_reader[i], NULL, thr_reader,
176 (void *)(long)i);
177 if (err != 0)
178 exit(1);
179 }
180 for (i = 0; i < NR_WRITE; i++) {
181 err = pthread_create(&tid_writer[i], NULL, thr_writer,
182 (void *)(long)i);
183 if (err != 0)
184 exit(1);
185 }
186
187 sleep(10);
188
189 for (i = 0; i < NR_READ; i++) {
190 err = pthread_join(tid_reader[i], &tret);
191 if (err != 0)
192 exit(1);
193 tot_rtime += reader_time[i];
194 }
195 for (i = 0; i < NR_WRITE; i++) {
196 err = pthread_join(tid_writer[i], &tret);
197 if (err != 0)
198 exit(1);
199 tot_wtime += writer_time[i];
200 }
201 printf("Time per read : %g cycles\n",
202 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
203 printf("Time per write : %g cycles\n",
204 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
205 free(per_thread_lock);
206
207 free(reader_time);
208 free(writer_time);
209 free(tid_reader);
210 free(tid_writer);
211
212 return 0;
213 }
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