tests/benchmark/test_perthreadlock.c

   1 // SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   2 //
   3 // SPDX-License-Identifier: GPL-2.0-or-later
   4
   5 /*
   6  * Userspace RCU library - test program
   7  */
   8
   9 #include <stdio.h>
  10 #include <pthread.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <sys/types.h>
  14 #include <sys/wait.h>
  15 #include <unistd.h>
  16 #include <stdio.h>
  17 #include <errno.h>
  18
  19 #include <urcu/arch.h>
  20 #include <urcu/assert.h>
  21 #include <urcu/tls-compat.h>
  22 #include "thread-id.h"
  23
  24 /* hardcoded number of CPUs */
  25 #define NR_CPUS 16384
  26
  27 #ifndef DYNAMIC_LINK_TEST
  28 #define _LGPL_SOURCE
  29 #endif
  30 #include <urcu.h>
  31
  32 struct test_array {
  33         int a;
  34 };
  35
  36 struct per_thread_lock {
  37         pthread_mutex_t lock;
  38 } __attribute__((aligned(CAA_CACHE_LINE_SIZE)));        /* cache-line aligned */
  39
  40 static struct per_thread_lock *per_thread_lock;
  41
  42 static unsigned long wdelay;
  43
  44 static volatile struct test_array test_array = { 8 };
  45
  46 static unsigned long duration;
  47
  48 /* read-side C.S. duration, in loops */
  49 static unsigned long rduration;
  50
  51 /* write-side C.S. duration, in loops */
  52 static unsigned long wduration;
  53
  54 static inline void loop_sleep(unsigned long loops)
  55 {
  56         while (loops-- != 0)
  57                 caa_cpu_relax();
  58 }
  59
  60 static int verbose_mode;
  61
  62 #define printf_verbose(fmt, args...)            \
  63         do {                                    \
  64                 if (verbose_mode)               \
  65                         printf(fmt, args);      \
  66         } while (0)
  67
  68 static unsigned int cpu_affinities[NR_CPUS];
  69 static unsigned int next_aff = 0;
  70 static int use_affinity = 0;
  71
  72 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
  73
  74 static void set_affinity(void)
  75 {
  76 #ifdef HAVE_SCHED_SETAFFINITY
  77         cpu_set_t mask;
  78         int cpu, ret;
  79 #endif /* HAVE_SCHED_SETAFFINITY */
  80
  81         if (!use_affinity)
  82                 return;
  83
  84 #ifdef HAVE_SCHED_SETAFFINITY
  85         ret = pthread_mutex_lock(&affinity_mutex);
  86         if (ret) {
  87                 errno = ret;
  88                 perror("Error in pthread mutex lock");
  89                 abort();
  90         }
  91         cpu = cpu_affinities[next_aff++];
  92         ret = pthread_mutex_unlock(&affinity_mutex);
  93         if (ret) {
  94                 errno = ret;
  95                 perror("Error in pthread mutex unlock");
  96                 abort();
  97         }
  98         CPU_ZERO(&mask);
  99         CPU_SET(cpu, &mask);
 100         sched_setaffinity(0, sizeof(mask), &mask);
 101 #endif /* HAVE_SCHED_SETAFFINITY */
 102 }
 103
 104 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
 105 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
 106
 107 static
 108 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *tot_nr_writes;
 109 static
 110 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *tot_nr_reads;
 111
 112 static unsigned int nr_readers;
 113 static unsigned int nr_writers;
 114
 115 static void urcu_mutex_lock(pthread_mutex_t *lock)
 116 {
 117         int ret;
 118
 119         ret = pthread_mutex_lock(lock);
 120         if (ret) {
 121                 errno = ret;
 122                 perror("Error in pthread mutex lock");
 123                 abort();
 124         }
 125 }
 126
 127 static void urcu_mutex_unlock(pthread_mutex_t *lock)
 128 {
 129         int ret;
 130
 131         ret = pthread_mutex_unlock(lock);
 132         if (ret) {
 133                 errno = ret;
 134                 perror("Error in pthread mutex unlock");
 135                 abort();
 136         }
 137 }
 138
 139 static
 140 void *thr_reader(void *data)
 141 {
 142         unsigned long tidx = (unsigned long)data;
 143
 144         printf_verbose("thread_begin %s, tid %lu\n",
 145                         "reader", urcu_get_thread_id());
 146
 147         set_affinity();
 148
 149         wait_until_go();
 150
 151         for (;;) {
 152                 int v;
 153
 154                 urcu_mutex_lock(&per_thread_lock[tidx].lock);
 155                 v = test_array.a;
 156                 urcu_posix_assert(v == 8);
 157                 if (caa_unlikely(rduration))
 158                         loop_sleep(rduration);
 159                 urcu_mutex_unlock(&per_thread_lock[tidx].lock);
 160                 URCU_TLS(nr_reads)++;
 161                 if (caa_unlikely(!test_duration_read()))
 162                         break;
 163         }
 164
 165         tot_nr_reads[tidx] = URCU_TLS(nr_reads);
 166         printf_verbose("thread_end %s, tid %lu\n",
 167                         "reader", urcu_get_thread_id());
 168         return ((void*)1);
 169
 170 }
 171
 172 static
 173 void *thr_writer(void *data)
 174 {
 175         unsigned long wtidx = (unsigned long)data;
 176         long tidx;
 177
 178         printf_verbose("thread_begin %s, tid %lu\n",
 179                         "writer", urcu_get_thread_id());
 180
 181         set_affinity();
 182
 183         wait_until_go();
 184
 185         for (;;) {
 186                 for (tidx = 0; tidx < (long)nr_readers; tidx++) {
 187                         urcu_mutex_lock(&per_thread_lock[tidx].lock);
 188                 }
 189                 test_array.a = 0;
 190                 test_array.a = 8;
 191                 if (caa_unlikely(wduration))
 192                         loop_sleep(wduration);
 193                 for (tidx = (long)nr_readers - 1; tidx >= 0; tidx--) {
 194                         urcu_mutex_unlock(&per_thread_lock[tidx].lock);
 195                 }
 196                 URCU_TLS(nr_writes)++;
 197                 if (caa_unlikely(!test_duration_write()))
 198                         break;
 199                 if (caa_unlikely(wdelay))
 200                         loop_sleep(wdelay);
 201         }
 202
 203         printf_verbose("thread_end %s, tid %lu\n",
 204                         "writer", urcu_get_thread_id());
 205         tot_nr_writes[wtidx] = URCU_TLS(nr_writes);
 206         return ((void*)2);
 207 }
 208
 209 static
 210 void show_usage(char **argv)
 211 {
 212         printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
 213                 argv[0]);
 214         printf("OPTIONS:\n");
 215         printf("        [-d delay] (writer period (us))\n");
 216         printf("        [-c duration] (reader C.S. duration (in loops))\n");
 217         printf("        [-e duration] (writer C.S. duration (in loops))\n");
 218         printf("        [-v] (verbose output)\n");
 219         printf("        [-a cpu#] [-a cpu#]... (affinity)\n");
 220         printf("\n");
 221 }
 222
 223 int main(int argc, char **argv)
 224 {
 225         int err;
 226         pthread_t *tid_reader, *tid_writer;
 227         void *tret;
 228         unsigned long long tot_reads = 0, tot_writes = 0;
 229         int i, a;
 230         unsigned int i_thr;
 231
 232         if (argc < 4) {
 233                 show_usage(argv);
 234                 return -1;
 235         }
 236         cmm_smp_mb();
 237
 238         err = sscanf(argv[1], "%u", &nr_readers);
 239         if (err != 1) {
 240                 show_usage(argv);
 241                 return -1;
 242         }
 243
 244         err = sscanf(argv[2], "%u", &nr_writers);
 245         if (err != 1) {
 246                 show_usage(argv);
 247                 return -1;
 248         }
 249
 250         err = sscanf(argv[3], "%lu", &duration);
 251         if (err != 1) {
 252                 show_usage(argv);
 253                 return -1;
 254         }
 255
 256         for (i = 4; i < argc; i++) {
 257                 if (argv[i][0] != '-')
 258                         continue;
 259                 switch (argv[i][1]) {
 260                 case 'a':
 261                         if (argc < i + 2) {
 262                                 show_usage(argv);
 263                                 return -1;
 264                         }
 265                         a = atoi(argv[++i]);
 266                         cpu_affinities[next_aff++] = a;
 267                         use_affinity = 1;
 268                         printf_verbose("Adding CPU %d affinity\n", a);
 269                         break;
 270                 case 'c':
 271                         if (argc < i + 2) {
 272                                 show_usage(argv);
 273                                 return -1;
 274                         }
 275                         rduration = atol(argv[++i]);
 276                         break;
 277                 case 'd':
 278                         if (argc < i + 2) {
 279                                 show_usage(argv);
 280                                 return -1;
 281                         }
 282                         wdelay = atol(argv[++i]);
 283                         break;
 284                 case 'e':
 285                         if (argc < i + 2) {
 286                                 show_usage(argv);
 287                                 return -1;
 288                         }
 289                         wduration = atol(argv[++i]);
 290                         break;
 291                 case 'v':
 292                         verbose_mode = 1;
 293                         break;
 294                 }
 295         }
 296
 297         printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
 298                 duration, nr_readers, nr_writers);
 299         printf_verbose("Writer delay : %lu loops.\n", wdelay);
 300         printf_verbose("Reader duration : %lu loops.\n", rduration);
 301         printf_verbose("thread %-6s, tid %lu\n",
 302                         "main", urcu_get_thread_id());
 303
 304         tid_reader = calloc(nr_readers, sizeof(*tid_reader));
 305         tid_writer = calloc(nr_writers, sizeof(*tid_writer));
 306         tot_nr_reads = calloc(nr_readers, sizeof(*tot_nr_reads));
 307         tot_nr_writes = calloc(nr_writers, sizeof(*tot_nr_writes));
 308         per_thread_lock = calloc(nr_readers, sizeof(*per_thread_lock));
 309         for (i_thr = 0; i_thr < nr_readers; i_thr++) {
 310                 pthread_mutex_init(&per_thread_lock[i_thr].lock, NULL);
 311         }
 312
 313         next_aff = 0;
 314
 315         for (i_thr = 0; i_thr < nr_readers; i_thr++) {
 316                 err = pthread_create(&tid_reader[i_thr], NULL, thr_reader,
 317                                      (void *)(long)i_thr);
 318                 if (err != 0)
 319                         exit(1);
 320         }
 321         for (i_thr = 0; i_thr < nr_writers; i_thr++) {
 322                 err = pthread_create(&tid_writer[i_thr], NULL, thr_writer,
 323                                      (void *)(long)i_thr);
 324                 if (err != 0)
 325                         exit(1);
 326         }
 327
 328         test_for(duration);
 329
 330         for (i_thr = 0; i_thr < nr_readers; i_thr++) {
 331                 err = pthread_join(tid_reader[i_thr], &tret);
 332                 if (err != 0)
 333                         exit(1);
 334                 tot_reads += tot_nr_reads[i_thr];
 335         }
 336         for (i_thr = 0; i_thr < nr_writers; i_thr++) {
 337                 err = pthread_join(tid_writer[i_thr], &tret);
 338                 if (err != 0)
 339                         exit(1);
 340                 tot_writes += tot_nr_writes[i_thr];
 341         }
 342
 343         printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
 344                tot_writes);
 345         printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
 346                 "nr_writers %3u "
 347                 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
 348                 argv[0], duration, nr_readers, rduration, wduration,
 349                 nr_writers, wdelay, tot_reads, tot_writes,
 350                 tot_reads + tot_writes);
 351
 352         free(tid_reader);
 353         free(tid_writer);
 354         free(tot_nr_reads);
 355         free(tot_nr_writes);
 356         free(per_thread_lock);
 357         return 0;
 358 }