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", (unsigned long) pthread_self(),
  95                         (unsigned long) gettid());
  96         sleep(2);
  97
  98         time1 = caa_get_cycles();
  99         for (i = 0; i < OUTER_READ_LOOP; i++) {
 100                 for (j = 0; j < INNER_READ_LOOP; j++) {
 101                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
 102                         assert(test_array.a == 8);
 103                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 104                 }
 105         }
 106         time2 = caa_get_cycles();
 107
 108         reader_time[tidx] = time2 - time1;
 109
 110         sleep(2);
 111         printf("thread_end %s, thread id : %lx, tid %lu\n",
 112                         "reader", (unsigned long) pthread_self(),
 113                         (unsigned long) gettid());
 114         return ((void*)1);
 115
 116 }
 117
 118 void *thr_writer(void *arg)
 119 {
 120         int i, j;
 121         long tidx;
 122         cycles_t time1, time2;
 123
 124         printf("thread_begin %s, thread id : %lx, tid %lu\n",
 125                         "writer", (unsigned long) pthread_self(),
 126                         (unsigned long) gettid());
 127         sleep(2);
 128
 129         for (i = 0; i < OUTER_WRITE_LOOP; i++) {
 130                 for (j = 0; j < INNER_WRITE_LOOP; j++) {
 131                         time1 = caa_get_cycles();
 132                         for (tidx = 0; tidx < NR_READ; tidx++) {
 133                                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 134                         }
 135                         test_array.a = 8;
 136                         for (tidx = NR_READ - 1; tidx >= 0; tidx--) {
 137                                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 138                         }
 139                         time2 = caa_get_cycles();
 140                         writer_time[(unsigned long)arg] += time2 - time1;
 141                         usleep(1);
 142                 }
 143         }
 144
 145         printf("thread_end %s, thread id : %lx, tid %lu\n",
 146                         "writer", (unsigned long) pthread_self(),
 147                         (unsigned long) gettid());
 148         return ((void*)2);
 149 }
 150
 151 int main(int argc, char **argv)
 152 {
 153         int err;
 154         pthread_t *tid_reader, *tid_writer;
 155         void *tret;
 156         int i;
 157         cycles_t tot_rtime = 0;
 158         cycles_t tot_wtime = 0;
 159
 160         if (argc < 2) {
 161                 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
 162                 exit(-1);
 163         }
 164         num_read = atoi(argv[1]);
 165         num_write = atoi(argv[2]);
 166
 167         reader_time = malloc(sizeof(*reader_time) * num_read);
 168         writer_time = malloc(sizeof(*writer_time) * num_write);
 169         tid_reader = malloc(sizeof(*tid_reader) * num_read);
 170         tid_writer = malloc(sizeof(*tid_writer) * num_write);
 171
 172         printf("thread %-6s, thread id : %lx, tid %lu\n",
 173                         "main", (unsigned long) pthread_self(),
 174                         (unsigned long) gettid());
 175
 176         per_thread_lock = malloc(sizeof(struct per_thread_lock) * NR_READ);
 177
 178         for (i = 0; i < NR_READ; i++) {
 179                 pthread_mutex_init(&per_thread_lock[i].lock, NULL);
 180         }
 181         for (i = 0; i < NR_READ; i++) {
 182                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 183                                      (void *)(long)i);
 184                 if (err != 0)
 185                         exit(1);
 186         }
 187         for (i = 0; i < NR_WRITE; i++) {
 188                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 189                                      (void *)(long)i);
 190                 if (err != 0)
 191                         exit(1);
 192         }
 193
 194         sleep(10);
 195
 196         for (i = 0; i < NR_READ; i++) {
 197                 err = pthread_join(tid_reader[i], &tret);
 198                 if (err != 0)
 199                         exit(1);
 200                 tot_rtime += reader_time[i];
 201         }
 202         for (i = 0; i < NR_WRITE; i++) {
 203                 err = pthread_join(tid_writer[i], &tret);
 204                 if (err != 0)
 205                         exit(1);
 206                 tot_wtime += writer_time[i];
 207         }
 208         printf("Time per read : %g cycles\n",
 209                (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
 210         printf("Time per write : %g cycles\n",
 211                (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
 212         free(per_thread_lock);
 213
 214         free(reader_time);
 215         free(writer_time);
 216         free(tid_reader);
 217         free(tid_writer);
 218
 219         return 0;
 220 }