tests/benchmark/test_rwlock_timing.c

   1 /*
   2  * test_urcu.c
   3  *
   4  * Userspace RCU library - 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 <pthread.h>
  33 #include <errno.h>
  34
  35 #include <urcu/arch.h>
  36
  37 #include "thread-id.h"
  38
  39 #include <urcu.h>
  40
  41 struct test_array {
  42         int a;
  43 };
  44
  45 /*
  46  * static rwlock initializer is broken on Cygwin. Use runtime
  47  * initialization.
  48  */
  49 pthread_rwlock_t lock;
  50
  51 static struct test_array test_array = { 8 };
  52
  53 #define OUTER_READ_LOOP 200U
  54 #define INNER_READ_LOOP 100000U
  55 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
  56
  57 #define OUTER_WRITE_LOOP 10U
  58 #define INNER_WRITE_LOOP 200U
  59 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
  60
  61 static int num_read;
  62 static int num_write;
  63
  64 #define NR_READ num_read
  65 #define NR_WRITE num_write
  66
  67 static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time;
  68 static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time;
  69
  70 void *thr_reader(void *arg)
  71 {
  72         unsigned int i, j;
  73         int ret;
  74         caa_cycles_t time1, time2;
  75
  76         printf("thread_begin %s, tid %lu\n",
  77                 "reader", urcu_get_thread_id());
  78         sleep(2);
  79
  80         time1 = caa_get_cycles();
  81         for (i = 0; i < OUTER_READ_LOOP; i++) {
  82                 for (j = 0; j < INNER_READ_LOOP; j++) {
  83                         ret = pthread_rwlock_rdlock(&lock);
  84                         if (ret) {
  85                                 fprintf(stderr, "reader pthread_rwlock_rdlock: %s\n", strerror(ret));
  86                                 abort();
  87                         }
  88
  89                         assert(test_array.a == 8);
  90
  91                         ret = pthread_rwlock_unlock(&lock);
  92                         if (ret) {
  93                                 fprintf(stderr, "reader pthread_rwlock_unlock: %s\n", strerror(ret));
  94                                 abort();
  95                         }
  96                 }
  97         }
  98         time2 = caa_get_cycles();
  99
 100         reader_time[(unsigned long)arg] = time2 - time1;
 101
 102         sleep(2);
 103         printf("thread_end %s, tid %lu\n",
 104                 "reader", urcu_get_thread_id());
 105         return ((void*)1);
 106
 107 }
 108
 109 void *thr_writer(void *arg)
 110 {
 111         unsigned int i, j;
 112         int ret;
 113         caa_cycles_t time1, time2;
 114
 115         printf("thread_begin %s, tid %lu\n",
 116                 "writer", urcu_get_thread_id());
 117         sleep(2);
 118
 119         for (i = 0; i < OUTER_WRITE_LOOP; i++) {
 120                 for (j = 0; j < INNER_WRITE_LOOP; j++) {
 121                         time1 = caa_get_cycles();
 122                         ret = pthread_rwlock_wrlock(&lock);
 123                         if (ret) {
 124                                 fprintf(stderr, "writer pthread_rwlock_wrlock: %s\n", strerror(ret));
 125                                 abort();
 126                         }
 127
 128                         test_array.a = 8;
 129
 130                         ret = pthread_rwlock_unlock(&lock);
 131                         if (ret) {
 132                                 fprintf(stderr, "writer pthread_rwlock_unlock: %s\n", strerror(ret));
 133                                 abort();
 134                         }
 135
 136                         time2 = caa_get_cycles();
 137                         writer_time[(unsigned long)arg] += time2 - time1;
 138                         usleep(1);
 139                 }
 140         }
 141
 142         printf("thread_end %s, tid %lu\n",
 143                 "writer", urcu_get_thread_id());
 144         return ((void*)2);
 145 }
 146
 147 int main(int argc, char **argv)
 148 {
 149         int err;
 150         pthread_t *tid_reader, *tid_writer;
 151         void *tret;
 152         int i;
 153         caa_cycles_t tot_rtime = 0;
 154         caa_cycles_t tot_wtime = 0;
 155
 156         if (argc < 2) {
 157                 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
 158                 exit(-1);
 159         }
 160         num_read = atoi(argv[1]);
 161         num_write = atoi(argv[2]);
 162
 163         err = pthread_rwlock_init(&lock, NULL);
 164         if (err != 0) {
 165                 fprintf(stderr, "pthread_rwlock_init: (%d) %s\n", err, strerror(err));
 166                 exit(1);
 167         }
 168
 169         reader_time = calloc(num_read, sizeof(*reader_time));
 170         writer_time = calloc(num_write, sizeof(*writer_time));
 171         tid_reader = calloc(num_read, sizeof(*tid_reader));
 172         tid_writer = calloc(num_write, sizeof(*tid_writer));
 173
 174         printf("thread %-6s, tid %lu\n",
 175                 "main", urcu_get_thread_id());
 176
 177         for (i = 0; i < NR_READ; i++) {
 178                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 179                                      (void *)(long)i);
 180                 if (err != 0)
 181                         exit(1);
 182         }
 183         for (i = 0; i < NR_WRITE; i++) {
 184                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 185                                      (void *)(long)i);
 186                 if (err != 0)
 187                         exit(1);
 188         }
 189
 190         sleep(10);
 191
 192         for (i = 0; i < NR_READ; i++) {
 193                 err = pthread_join(tid_reader[i], &tret);
 194                 if (err != 0)
 195                         exit(1);
 196                 tot_rtime += reader_time[i];
 197         }
 198         for (i = 0; i < NR_WRITE; i++) {
 199                 err = pthread_join(tid_writer[i], &tret);
 200                 if (err != 0)
 201                         exit(1);
 202                 tot_wtime += writer_time[i];
 203         }
 204         printf("Time per read : %g cycles\n",
 205                (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
 206         printf("Time per write : %g cycles\n",
 207                (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
 208
 209         err = pthread_rwlock_destroy(&lock);
 210         if (err != 0) {
 211                 fprintf(stderr, "pthread_rwlock_destroy: (%d) %s\n", err, strerror(err));
 212                 exit(1);
 213         }
 214         free(reader_time);
 215         free(writer_time);
 216         free(tid_reader);
 217         free(tid_writer);
 218
 219         return 0;
 220 }