tests/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@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 static struct test_array test_array = { 8 };
  46
  47 struct per_thread_lock {
  48         pthread_mutex_t lock;
  49 } __attribute__((aligned(CAA_CACHE_LINE_SIZE)));        /* cache-line aligned */
  50
  51 static struct per_thread_lock *per_thread_lock;
  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 cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time;
  68 static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time;
  69
  70 void *thr_reader(void *arg)
  71 {
  72         int i, j;
  73         cycles_t time1, time2;
  74         long tidx = (long)arg;
  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                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
  84                         assert(test_array.a == 8);
  85                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
  86                 }
  87         }
  88         time2 = caa_get_cycles();
  89
  90         reader_time[tidx] = time2 - time1;
  91
  92         sleep(2);
  93         printf("thread_end %s, tid %lu\n",
  94                 "reader", urcu_get_thread_id());
  95         return ((void*)1);
  96
  97 }
  98
  99 void *thr_writer(void *arg)
 100 {
 101         int i, j;
 102         long tidx;
 103         cycles_t time1, time2;
 104
 105         printf("thread_begin %s, tid %lu\n",
 106                 "writer", urcu_get_thread_id());
 107         sleep(2);
 108
 109         for (i = 0; i < OUTER_WRITE_LOOP; i++) {
 110                 for (j = 0; j < INNER_WRITE_LOOP; j++) {
 111                         time1 = caa_get_cycles();
 112                         for (tidx = 0; tidx < NR_READ; tidx++) {
 113                                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 114                         }
 115                         test_array.a = 8;
 116                         for (tidx = NR_READ - 1; tidx >= 0; tidx--) {
 117                                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 118                         }
 119                         time2 = caa_get_cycles();
 120                         writer_time[(unsigned long)arg] += time2 - time1;
 121                         usleep(1);
 122                 }
 123         }
 124
 125         printf("thread_end %s, tid %lu\n",
 126                 "writer", urcu_get_thread_id());
 127         return ((void*)2);
 128 }
 129
 130 int main(int argc, char **argv)
 131 {
 132         int err;
 133         pthread_t *tid_reader, *tid_writer;
 134         void *tret;
 135         int i;
 136         cycles_t tot_rtime = 0;
 137         cycles_t tot_wtime = 0;
 138
 139         if (argc < 2) {
 140                 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
 141                 exit(-1);
 142         }
 143         num_read = atoi(argv[1]);
 144         num_write = atoi(argv[2]);
 145
 146         reader_time = malloc(sizeof(*reader_time) * num_read);
 147         writer_time = malloc(sizeof(*writer_time) * num_write);
 148         tid_reader = malloc(sizeof(*tid_reader) * num_read);
 149         tid_writer = malloc(sizeof(*tid_writer) * num_write);
 150
 151         printf("thread %-6s, tid %lu\n",
 152                 "main", urcu_get_thread_id());
 153
 154         per_thread_lock = malloc(sizeof(struct per_thread_lock) * NR_READ);
 155
 156         for (i = 0; i < NR_READ; i++) {
 157                 pthread_mutex_init(&per_thread_lock[i].lock, NULL);
 158         }
 159         for (i = 0; i < NR_READ; i++) {
 160                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 161                                      (void *)(long)i);
 162                 if (err != 0)
 163                         exit(1);
 164         }
 165         for (i = 0; i < NR_WRITE; i++) {
 166                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 167                                      (void *)(long)i);
 168                 if (err != 0)
 169                         exit(1);
 170         }
 171
 172         sleep(10);
 173
 174         for (i = 0; i < NR_READ; i++) {
 175                 err = pthread_join(tid_reader[i], &tret);
 176                 if (err != 0)
 177                         exit(1);
 178                 tot_rtime += reader_time[i];
 179         }
 180         for (i = 0; i < NR_WRITE; i++) {
 181                 err = pthread_join(tid_writer[i], &tret);
 182                 if (err != 0)
 183                         exit(1);
 184                 tot_wtime += writer_time[i];
 185         }
 186         printf("Time per read : %g cycles\n",
 187                (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
 188         printf("Time per write : %g cycles\n",
 189                (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
 190         free(per_thread_lock);
 191
 192         free(reader_time);
 193         free(writer_time);
 194         free(tid_reader);
 195         free(tid_writer);
 196
 197         return 0;
 198 }