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