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@polymtl.ca>
   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 <sys/syscall.h>
  33 #include <pthread.h>
  34 #include <arch.h>
  35
  36 #if defined(_syscall0)
  37 _syscall0(pid_t, gettid)
  38 #elif defined(__NR_gettid)
  39 static inline pid_t gettid(void)
  40 {
  41         return syscall(__NR_gettid);
  42 }
  43 #else
  44 #warning "use pid as tid"
  45 static inline pid_t gettid(void)
  46 {
  47         return getpid();
  48 }
  49 #endif
  50
  51 #include "urcu.h"
  52
  53 struct test_array {
  54         int a;
  55 };
  56
  57 static struct test_array test_array = { 8 };
  58
  59 struct per_thread_lock {
  60         pthread_mutex_t lock;
  61 } __attribute__((aligned(128)));        /* cache-line aligned */
  62
  63 static struct per_thread_lock *per_thread_lock;
  64
  65 #define OUTER_READ_LOOP 200U
  66 #define INNER_READ_LOOP 100000U
  67 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
  68
  69 #define OUTER_WRITE_LOOP 10U
  70 #define INNER_WRITE_LOOP 200U
  71 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
  72
  73 static int num_read;
  74 static int num_write;
  75
  76 #define NR_READ num_read
  77 #define NR_WRITE num_write
  78
  79 static cycles_t __attribute__((aligned(128))) *reader_time;
  80 static cycles_t __attribute__((aligned(128))) *writer_time;
  81
  82 void *thr_reader(void *arg)
  83 {
  84         int i, j;
  85         cycles_t time1, time2;
  86         long tidx = (long)arg;
  87
  88         printf("thread_begin %s, thread id : %lx, tid %lu\n",
  89                         "reader", pthread_self(), (unsigned long)gettid());
  90         sleep(2);
  91
  92         time1 = get_cycles();
  93         for (i = 0; i < OUTER_READ_LOOP; i++) {
  94                 for (j = 0; j < INNER_READ_LOOP; j++) {
  95                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
  96                         assert(test_array.a == 8);
  97                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
  98                 }
  99         }
 100         time2 = get_cycles();
 101
 102         reader_time[tidx] = time2 - time1;
 103
 104         sleep(2);
 105         printf("thread_end %s, thread id : %lx, tid %lu\n",
 106                         "reader", pthread_self(), (unsigned long)gettid());
 107         return ((void*)1);
 108
 109 }
 110
 111 void *thr_writer(void *arg)
 112 {
 113         int i, j;
 114         long tidx;
 115         cycles_t time1, time2;
 116
 117         printf("thread_begin %s, thread id : %lx, tid %lu\n",
 118                         "writer", pthread_self(), (unsigned long)gettid());
 119         sleep(2);
 120
 121         for (i = 0; i < OUTER_WRITE_LOOP; i++) {
 122                 for (j = 0; j < INNER_WRITE_LOOP; j++) {
 123                         time1 = get_cycles();
 124                         for (tidx = 0; tidx < NR_READ; tidx++) {
 125                                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 126                         }
 127                         test_array.a = 8;
 128                         for (tidx = NR_READ - 1; tidx >= 0; tidx--) {
 129                                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 130                         }
 131                         time2 = get_cycles();
 132                         writer_time[(unsigned long)arg] += time2 - time1;
 133                         usleep(1);
 134                 }
 135         }
 136
 137         printf("thread_end %s, thread id : %lx, tid %lu\n",
 138                         "writer", pthread_self(), (unsigned long)gettid());
 139         return ((void*)2);
 140 }
 141
 142 int main(int argc, char **argv)
 143 {
 144         int err;
 145         pthread_t *tid_reader, *tid_writer;
 146         void *tret;
 147         int i;
 148         cycles_t tot_rtime = 0;
 149         cycles_t tot_wtime = 0;
 150
 151         if (argc < 2) {
 152                 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
 153                 exit(-1);
 154         }
 155         num_read = atoi(argv[1]);
 156         num_write = atoi(argv[2]);
 157
 158         reader_time = malloc(sizeof(*reader_time) * num_read);
 159         writer_time = malloc(sizeof(*writer_time) * num_write);
 160         tid_reader = malloc(sizeof(*tid_reader) * num_read);
 161         tid_writer = malloc(sizeof(*tid_writer) * num_write);
 162
 163         printf("thread %-6s, thread id : %lx, tid %lu\n",
 164                         "main", pthread_self(), (unsigned long)gettid());
 165
 166         per_thread_lock = malloc(sizeof(struct per_thread_lock) * NR_READ);
 167
 168         for (i = 0; i < NR_READ; i++) {
 169                 pthread_mutex_init(&per_thread_lock[i].lock, NULL);
 170         }
 171         for (i = 0; i < NR_READ; i++) {
 172                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 173                                      (void *)(long)i);
 174                 if (err != 0)
 175                         exit(1);
 176         }
 177         for (i = 0; i < NR_WRITE; i++) {
 178                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 179                                      (void *)(long)i);
 180                 if (err != 0)
 181                         exit(1);
 182         }
 183
 184         sleep(10);
 185
 186         for (i = 0; i < NR_READ; i++) {
 187                 err = pthread_join(tid_reader[i], &tret);
 188                 if (err != 0)
 189                         exit(1);
 190                 tot_rtime += reader_time[i];
 191         }
 192         for (i = 0; i < NR_WRITE; i++) {
 193                 err = pthread_join(tid_writer[i], &tret);
 194                 if (err != 0)
 195                         exit(1);
 196                 tot_wtime += writer_time[i];
 197         }
 198         printf("Time per read : %g cycles\n",
 199                (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
 200         printf("Time per write : %g cycles\n",
 201                (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
 202         free(per_thread_lock);
 203
 204         free(reader_time);
 205         free(writer_time);
 206         free(tid_reader);
 207         free(tid_writer);
 208
 209         return 0;
 210 }