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 #ifdef __linux__
  38 #include <syscall.h>
  39 #endif
  40
  41 #if defined(_syscall0)
  42 _syscall0(pid_t, gettid)
  43 #elif defined(__NR_gettid)
  44 static inline pid_t gettid(void)
  45 {
  46         return syscall(__NR_gettid);
  47 }
  48 #else
  49 #warning "use pid as tid"
  50 static inline pid_t gettid(void)
  51 {
  52         return getpid();
  53 }
  54 #endif
  55
  56 #include <urcu.h>
  57
  58 struct test_array {
  59         int a;
  60 };
  61
  62 static struct test_array test_array = { 8 };
  63
  64 struct per_thread_lock {
  65         pthread_mutex_t lock;
  66 } __attribute__((aligned(CAA_CACHE_LINE_SIZE)));        /* cache-line aligned */
  67
  68 static struct per_thread_lock *per_thread_lock;
  69
  70 #define OUTER_READ_LOOP 200U
  71 #define INNER_READ_LOOP 100000U
  72 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
  73
  74 #define OUTER_WRITE_LOOP 10U
  75 #define INNER_WRITE_LOOP 200U
  76 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
  77
  78 static int num_read;
  79 static int num_write;
  80
  81 #define NR_READ num_read
  82 #define NR_WRITE num_write
  83
  84 static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time;
  85 static cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time;
  86
  87 void *thr_reader(void *arg)
  88 {
  89         int i, j;
  90         cycles_t time1, time2;
  91         long tidx = (long)arg;
  92
  93         printf("thread_begin %s, thread id : %lx, tid %lu\n",
  94                         "reader", pthread_self(), (unsigned long)gettid());
  95         sleep(2);
  96
  97         time1 = caa_get_cycles();
  98         for (i = 0; i < OUTER_READ_LOOP; i++) {
  99                 for (j = 0; j < INNER_READ_LOOP; j++) {
 100                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
 101                         assert(test_array.a == 8);
 102                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 103                 }
 104         }
 105         time2 = caa_get_cycles();
 106
 107         reader_time[tidx] = time2 - time1;
 108
 109         sleep(2);
 110         printf("thread_end %s, thread id : %lx, tid %lu\n",
 111                         "reader", pthread_self(), (unsigned long)gettid());
 112         return ((void*)1);
 113
 114 }
 115
 116 void *thr_writer(void *arg)
 117 {
 118         int i, j;
 119         long tidx;
 120         cycles_t time1, time2;
 121
 122         printf("thread_begin %s, thread id : %lx, tid %lu\n",
 123                         "writer", pthread_self(), (unsigned long)gettid());
 124         sleep(2);
 125
 126         for (i = 0; i < OUTER_WRITE_LOOP; i++) {
 127                 for (j = 0; j < INNER_WRITE_LOOP; j++) {
 128                         time1 = caa_get_cycles();
 129                         for (tidx = 0; tidx < NR_READ; tidx++) {
 130                                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 131                         }
 132                         test_array.a = 8;
 133                         for (tidx = NR_READ - 1; tidx >= 0; tidx--) {
 134                                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 135                         }
 136                         time2 = caa_get_cycles();
 137                         writer_time[(unsigned long)arg] += time2 - time1;
 138                         usleep(1);
 139                 }
 140         }
 141
 142         printf("thread_end %s, thread id : %lx, tid %lu\n",
 143                         "writer", pthread_self(), (unsigned long)gettid());
 144         return ((void*)2);
 145 }
 146
 147 int main(int argc, char **argv)
 148 {
 149         int err;
 150         pthread_t *tid_reader, *tid_writer;
 151         void *tret;
 152         int i;
 153         cycles_t tot_rtime = 0;
 154         cycles_t tot_wtime = 0;
 155
 156         if (argc < 2) {
 157                 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
 158                 exit(-1);
 159         }
 160         num_read = atoi(argv[1]);
 161         num_write = atoi(argv[2]);
 162
 163         reader_time = malloc(sizeof(*reader_time) * num_read);
 164         writer_time = malloc(sizeof(*writer_time) * num_write);
 165         tid_reader = malloc(sizeof(*tid_reader) * num_read);
 166         tid_writer = malloc(sizeof(*tid_writer) * num_write);
 167
 168         printf("thread %-6s, thread id : %lx, tid %lu\n",
 169                         "main", pthread_self(), (unsigned long)gettid());
 170
 171         per_thread_lock = malloc(sizeof(struct per_thread_lock) * NR_READ);
 172
 173         for (i = 0; i < NR_READ; i++) {
 174                 pthread_mutex_init(&per_thread_lock[i].lock, NULL);
 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         free(per_thread_lock);
 208
 209         free(reader_time);
 210         free(writer_time);
 211         free(tid_reader);
 212         free(tid_writer);
 213
 214         return 0;
 215 }