tests/benchmark/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 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 static
  71 void *thr_reader(void *arg)
  72 {
  73         unsigned int i, j;
  74         caa_cycles_t time1, time2;
  75         long tidx = (long)arg;
  76
  77         printf("thread_begin %s, tid %lu\n",
  78                 "reader", urcu_get_thread_id());
  79         sleep(2);
  80
  81         time1 = caa_get_cycles();
  82         for (i = 0; i < OUTER_READ_LOOP; i++) {
  83                 for (j = 0; j < INNER_READ_LOOP; j++) {
  84                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
  85                         assert(test_array.a == 8);
  86                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
  87                 }
  88         }
  89         time2 = caa_get_cycles();
  90
  91         reader_time[tidx] = time2 - time1;
  92
  93         sleep(2);
  94         printf("thread_end %s, tid %lu\n",
  95                 "reader", urcu_get_thread_id());
  96         return ((void*)1);
  97
  98 }
  99
 100 static
 101 void *thr_writer(void *arg)
 102 {
 103         unsigned int i, j;
 104         long tidx;
 105         caa_cycles_t time1, time2;
 106
 107         printf("thread_begin %s, tid %lu\n",
 108                 "writer", urcu_get_thread_id());
 109         sleep(2);
 110
 111         for (i = 0; i < OUTER_WRITE_LOOP; i++) {
 112                 for (j = 0; j < INNER_WRITE_LOOP; j++) {
 113                         time1 = caa_get_cycles();
 114                         for (tidx = 0; tidx < NR_READ; tidx++) {
 115                                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 116                         }
 117                         test_array.a = 8;
 118                         for (tidx = NR_READ - 1; tidx >= 0; tidx--) {
 119                                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 120                         }
 121                         time2 = caa_get_cycles();
 122                         writer_time[(unsigned long)arg] += time2 - time1;
 123                         usleep(1);
 124                 }
 125         }
 126
 127         printf("thread_end %s, tid %lu\n",
 128                 "writer", urcu_get_thread_id());
 129         return ((void*)2);
 130 }
 131
 132 int main(int argc, char **argv)
 133 {
 134         int err;
 135         pthread_t *tid_reader, *tid_writer;
 136         void *tret;
 137         int i;
 138         caa_cycles_t tot_rtime = 0;
 139         caa_cycles_t tot_wtime = 0;
 140
 141         if (argc < 2) {
 142                 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
 143                 exit(-1);
 144         }
 145         num_read = atoi(argv[1]);
 146         num_write = atoi(argv[2]);
 147
 148         reader_time = calloc(num_read, sizeof(*reader_time));
 149         writer_time = calloc(num_write, sizeof(*writer_time));
 150         tid_reader = calloc(num_read, sizeof(*tid_reader));
 151         tid_writer = calloc(num_write, sizeof(*tid_writer));
 152
 153         printf("thread %-6s, tid %lu\n",
 154                 "main", urcu_get_thread_id());
 155
 156         per_thread_lock = malloc(sizeof(struct per_thread_lock) * NR_READ);
 157
 158         for (i = 0; i < NR_READ; i++) {
 159                 pthread_mutex_init(&per_thread_lock[i].lock, NULL);
 160         }
 161         for (i = 0; i < NR_READ; i++) {
 162                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 163                                      (void *)(long)i);
 164                 if (err != 0)
 165                         exit(1);
 166         }
 167         for (i = 0; i < NR_WRITE; i++) {
 168                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 169                                      (void *)(long)i);
 170                 if (err != 0)
 171                         exit(1);
 172         }
 173
 174         sleep(10);
 175
 176         for (i = 0; i < NR_READ; i++) {
 177                 err = pthread_join(tid_reader[i], &tret);
 178                 if (err != 0)
 179                         exit(1);
 180                 tot_rtime += reader_time[i];
 181         }
 182         for (i = 0; i < NR_WRITE; i++) {
 183                 err = pthread_join(tid_writer[i], &tret);
 184                 if (err != 0)
 185                         exit(1);
 186                 tot_wtime += writer_time[i];
 187         }
 188         printf("Time per read : %g cycles\n",
 189                (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
 190         printf("Time per write : %g cycles\n",
 191                (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
 192         free(per_thread_lock);
 193
 194         free(reader_time);
 195         free(writer_time);
 196         free(tid_reader);
 197         free(tid_writer);
 198
 199         return 0;
 200 }