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 <sys/syscall.h>
  33 #include <pthread.h>
  34 #include <errno.h>
  35
  36 #include <urcu/arch.h>
  37
  38 #if defined(_syscall0)
  39 _syscall0(pid_t, gettid)
  40 #elif defined(__NR_gettid)
  41 static inline pid_t gettid(void)
  42 {
  43         return syscall(__NR_gettid);
  44 }
  45 #else
  46 #warning "use pid as tid"
  47 static inline pid_t gettid(void)
  48 {
  49         return getpid();
  50 }
  51 #endif
  52
  53 #include <urcu.h>
  54
  55 struct test_array {
  56         int a;
  57 };
  58
  59 static struct test_array test_array = { 8 };
  60
  61 struct per_thread_lock {
  62         pthread_mutex_t lock;
  63 } __attribute__((aligned(CACHE_LINE_SIZE)));    /* cache-line aligned */
  64
  65 static struct per_thread_lock *per_thread_lock;
  66
  67 #define OUTER_READ_LOOP 200U
  68 #define INNER_READ_LOOP 100000U
  69 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
  70
  71 #define OUTER_WRITE_LOOP 10U
  72 #define INNER_WRITE_LOOP 200U
  73 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
  74
  75 static int num_read;
  76 static int num_write;
  77
  78 #define NR_READ num_read
  79 #define NR_WRITE num_write
  80
  81 static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time;
  82 static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time;
  83
  84 void *thr_reader(void *arg)
  85 {
  86         int i, j;
  87         cycles_t time1, time2;
  88         long tidx = (long)arg;
  89
  90         printf("thread_begin %s, thread id : %lx, tid %lu\n",
  91                         "reader", pthread_self(), (unsigned long)gettid());
  92         sleep(2);
  93
  94         time1 = get_cycles();
  95         for (i = 0; i < OUTER_READ_LOOP; i++) {
  96                 for (j = 0; j < INNER_READ_LOOP; j++) {
  97                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
  98                         assert(test_array.a == 8);
  99                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 100                 }
 101         }
 102         time2 = get_cycles();
 103
 104         reader_time[tidx] = time2 - time1;
 105
 106         sleep(2);
 107         printf("thread_end %s, thread id : %lx, tid %lu\n",
 108                         "reader", pthread_self(), (unsigned long)gettid());
 109         return ((void*)1);
 110
 111 }
 112
 113 void *thr_writer(void *arg)
 114 {
 115         int i, j;
 116         long tidx;
 117         cycles_t time1, time2;
 118
 119         printf("thread_begin %s, thread id : %lx, tid %lu\n",
 120                         "writer", pthread_self(), (unsigned long)gettid());
 121         sleep(2);
 122
 123         for (i = 0; i < OUTER_WRITE_LOOP; i++) {
 124                 for (j = 0; j < INNER_WRITE_LOOP; j++) {
 125                         time1 = get_cycles();
 126                         for (tidx = 0; tidx < NR_READ; tidx++) {
 127                                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 128                         }
 129                         test_array.a = 8;
 130                         for (tidx = NR_READ - 1; tidx >= 0; tidx--) {
 131                                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 132                         }
 133                         time2 = get_cycles();
 134                         writer_time[(unsigned long)arg] += time2 - time1;
 135                         usleep(1);
 136                 }
 137         }
 138
 139         printf("thread_end %s, thread id : %lx, tid %lu\n",
 140                         "writer", pthread_self(), (unsigned long)gettid());
 141         return ((void*)2);
 142 }
 143
 144 int main(int argc, char **argv)
 145 {
 146         int err;
 147         pthread_t *tid_reader, *tid_writer;
 148         void *tret;
 149         int i;
 150         cycles_t tot_rtime = 0;
 151         cycles_t tot_wtime = 0;
 152
 153         if (argc < 2) {
 154                 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
 155                 exit(-1);
 156         }
 157         num_read = atoi(argv[1]);
 158         num_write = atoi(argv[2]);
 159
 160         reader_time = malloc(sizeof(*reader_time) * num_read);
 161         writer_time = malloc(sizeof(*writer_time) * num_write);
 162         tid_reader = malloc(sizeof(*tid_reader) * num_read);
 163         tid_writer = malloc(sizeof(*tid_writer) * num_write);
 164
 165         printf("thread %-6s, thread id : %lx, tid %lu\n",
 166                         "main", pthread_self(), (unsigned long)gettid());
 167
 168         per_thread_lock = malloc(sizeof(struct per_thread_lock) * NR_READ);
 169
 170         for (i = 0; i < NR_READ; i++) {
 171                 pthread_mutex_init(&per_thread_lock[i].lock, NULL);
 172         }
 173         for (i = 0; i < NR_READ; i++) {
 174                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 175                                      (void *)(long)i);
 176                 if (err != 0)
 177                         exit(1);
 178         }
 179         for (i = 0; i < NR_WRITE; i++) {
 180                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 181                                      (void *)(long)i);
 182                 if (err != 0)
 183                         exit(1);
 184         }
 185
 186         sleep(10);
 187
 188         for (i = 0; i < NR_READ; i++) {
 189                 err = pthread_join(tid_reader[i], &tret);
 190                 if (err != 0)
 191                         exit(1);
 192                 tot_rtime += reader_time[i];
 193         }
 194         for (i = 0; i < NR_WRITE; i++) {
 195                 err = pthread_join(tid_writer[i], &tret);
 196                 if (err != 0)
 197                         exit(1);
 198                 tot_wtime += writer_time[i];
 199         }
 200         printf("Time per read : %g cycles\n",
 201                (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
 202         printf("Time per write : %g cycles\n",
 203                (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
 204         free(per_thread_lock);
 205
 206         free(reader_time);
 207         free(writer_time);
 208         free(tid_reader);
 209         free(tid_writer);
 210
 211         return 0;
 212 }