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         int i, j, ret;
  73         caa_cycles_t time1, time2;
  74
  75         printf("thread_begin %s, tid %lu\n",
  76                 "reader", urcu_get_thread_id());
  77         sleep(2);
  78
  79         time1 = caa_get_cycles();
  80         for (i = 0; i < OUTER_READ_LOOP; i++) {
  81                 for (j = 0; j < INNER_READ_LOOP; j++) {
  82                         ret = pthread_rwlock_rdlock(&lock);
  83                         if (ret) {
  84                                 fprintf(stderr, "reader pthread_rwlock_rdlock: %s\n", strerror(ret));
  85                                 abort();
  86                         }
  87
  88                         assert(test_array.a == 8);
  89
  90                         ret = pthread_rwlock_unlock(&lock);
  91                         if (ret) {
  92                                 fprintf(stderr, "reader pthread_rwlock_unlock: %s\n", strerror(ret));
  93                                 abort();
  94                         }
  95                 }
  96         }
  97         time2 = caa_get_cycles();
  98
  99         reader_time[(unsigned long)arg] = time2 - time1;
 100
 101         sleep(2);
 102         printf("thread_end %s, tid %lu\n",
 103                 "reader", urcu_get_thread_id());
 104         return ((void*)1);
 105
 106 }
 107
 108 void *thr_writer(void *arg)
 109 {
 110         int i, j, ret;
 111         caa_cycles_t time1, time2;
 112
 113         printf("thread_begin %s, tid %lu\n",
 114                 "writer", urcu_get_thread_id());
 115         sleep(2);
 116
 117         for (i = 0; i < OUTER_WRITE_LOOP; i++) {
 118                 for (j = 0; j < INNER_WRITE_LOOP; j++) {
 119                         time1 = caa_get_cycles();
 120                         ret = pthread_rwlock_wrlock(&lock);
 121                         if (ret) {
 122                                 fprintf(stderr, "writer pthread_rwlock_wrlock: %s\n", strerror(ret));
 123                                 abort();
 124                         }
 125
 126                         test_array.a = 8;
 127
 128                         ret = pthread_rwlock_unlock(&lock);
 129                         if (ret) {
 130                                 fprintf(stderr, "writer pthread_rwlock_unlock: %s\n", strerror(ret));
 131                                 abort();
 132                         }
 133
 134                         time2 = caa_get_cycles();
 135                         writer_time[(unsigned long)arg] += time2 - time1;
 136                         usleep(1);
 137                 }
 138         }
 139
 140         printf("thread_end %s, tid %lu\n",
 141                 "writer", urcu_get_thread_id());
 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         caa_cycles_t tot_rtime = 0;
 152         caa_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         err = pthread_rwlock_init(&lock, NULL);
 162         if (err != 0) {
 163                 fprintf(stderr, "pthread_rwlock_init: (%d) %s\n", err, strerror(err));
 164                 exit(1);
 165         }
 166
 167         reader_time = calloc(num_read, sizeof(*reader_time));
 168         writer_time = calloc(num_write, sizeof(*writer_time));
 169         tid_reader = calloc(num_read, sizeof(*tid_reader));
 170         tid_writer = calloc(num_write, sizeof(*tid_writer));
 171
 172         printf("thread %-6s, tid %lu\n",
 173                 "main", urcu_get_thread_id());
 174
 175         for (i = 0; i < NR_READ; i++) {
 176                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 177                                      (void *)(long)i);
 178                 if (err != 0)
 179                         exit(1);
 180         }
 181         for (i = 0; i < NR_WRITE; i++) {
 182                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 183                                      (void *)(long)i);
 184                 if (err != 0)
 185                         exit(1);
 186         }
 187
 188         sleep(10);
 189
 190         for (i = 0; i < NR_READ; i++) {
 191                 err = pthread_join(tid_reader[i], &tret);
 192                 if (err != 0)
 193                         exit(1);
 194                 tot_rtime += reader_time[i];
 195         }
 196         for (i = 0; i < NR_WRITE; i++) {
 197                 err = pthread_join(tid_writer[i], &tret);
 198                 if (err != 0)
 199                         exit(1);
 200                 tot_wtime += writer_time[i];
 201         }
 202         printf("Time per read : %g cycles\n",
 203                (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
 204         printf("Time per write : %g cycles\n",
 205                (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
 206
 207         err = pthread_rwlock_destroy(&lock);
 208         if (err != 0) {
 209                 fprintf(stderr, "pthread_rwlock_destroy: (%d) %s\n", err, strerror(err));
 210                 exit(1);
 211         }
 212         free(reader_time);
 213         free(writer_time);
 214         free(tid_reader);
 215         free(tid_writer);
 216
 217         return 0;
 218 }