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 void *thr_reader(void *arg)
  71 {
  72         caa_cycles_t time1, time2;
  73         long tidx = (long)arg;
  74         unsigned int i, j;
  75         int ret;
  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                         ret = pthread_mutex_lock(&per_thread_lock[tidx].lock);
  85                         if (ret) {
  86                                 perror("Error in pthread mutex lock");
  87                                 exit(-1);
  88                         }
  89                         assert(test_array.a == 8);
  90                         ret = pthread_mutex_unlock(&per_thread_lock[tidx].lock);
  91                         if (ret) {
  92                                 perror("Error in pthread mutex unlock");
  93                                 exit(-1);
  94                         }
  95                 }
  96         }
  97         time2 = caa_get_cycles();
  98
  99         reader_time[tidx] = 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         caa_cycles_t time1, time2;
 111         unsigned int i, j;
 112         long tidx;
 113         int ret;
 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                         for (tidx = 0; tidx < NR_READ; tidx++) {
 123                                 ret = pthread_mutex_lock(&per_thread_lock[tidx].lock);
 124                                 if (ret) {
 125                                         perror("Error in pthread mutex lock");
 126                                         exit(-1);
 127                                 }
 128                         }
 129                         test_array.a = 8;
 130                         for (tidx = NR_READ - 1; tidx >= 0; tidx--) {
 131                                 ret = pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 132                                 if (ret) {
 133                                         perror("Error in pthread mutex unlock");
 134                                         exit(-1);
 135                                 }
 136                         }
 137                         time2 = caa_get_cycles();
 138                         writer_time[(unsigned long)arg] += time2 - time1;
 139                         usleep(1);
 140                 }
 141         }
 142
 143         printf("thread_end %s, tid %lu\n",
 144                 "writer", urcu_get_thread_id());
 145         return ((void*)2);
 146 }
 147
 148 int main(int argc, char **argv)
 149 {
 150         int err;
 151         pthread_t *tid_reader, *tid_writer;
 152         void *tret;
 153         int i;
 154         caa_cycles_t tot_rtime = 0;
 155         caa_cycles_t tot_wtime = 0;
 156
 157         if (argc < 2) {
 158                 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
 159                 exit(-1);
 160         }
 161         num_read = atoi(argv[1]);
 162         num_write = atoi(argv[2]);
 163
 164         reader_time = calloc(num_read, sizeof(*reader_time));
 165         writer_time = calloc(num_write, sizeof(*writer_time));
 166         tid_reader = calloc(num_read, sizeof(*tid_reader));
 167         tid_writer = calloc(num_write, sizeof(*tid_writer));
 168
 169         printf("thread %-6s, tid %lu\n",
 170                 "main", urcu_get_thread_id());
 171
 172         per_thread_lock = malloc(sizeof(struct per_thread_lock) * NR_READ);
 173
 174         for (i = 0; i < NR_READ; i++) {
 175                 pthread_mutex_init(&per_thread_lock[i].lock, NULL);
 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         free(per_thread_lock);
 209
 210         free(reader_time);
 211         free(writer_time);
 212         free(tid_reader);
 213         free(tid_writer);
 214
 215         return 0;
 216 }