tests/test_lfs_baseline.c

   1 /*
   2  * test_lfs_baseline.c
   3  *
   4  * Userspace RCU library - test lock-free stack
   5  *
   6  * Copyright February 2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  * Copyright February 2010 - Paolo Bonzini <pbonzini@redhat.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  22  */
  23
  24 #define _GNU_SOURCE
  25 #include "../config.h"
  26 #include <stdio.h>
  27 #include <pthread.h>
  28 #include <stdlib.h>
  29 #include <stdint.h>
  30 #include <stdbool.h>
  31 #include <string.h>
  32 #include <sys/types.h>
  33 #include <sys/wait.h>
  34 #include <unistd.h>
  35 #include <stdio.h>
  36 #include <assert.h>
  37 #include <sched.h>
  38 #include <errno.h>
  39
  40 #include <urcu/arch.h>
  41 #include <urcu/list.h>
  42
  43 #ifdef __linux__
  44 #include <syscall.h>
  45 #endif
  46
  47 /* hardcoded number of CPUs */
  48 #define NR_CPUS 16384
  49
  50 #if defined(_syscall0)
  51 _syscall0(pid_t, gettid)
  52 #elif defined(__NR_gettid)
  53 static inline pid_t gettid(void)
  54 {
  55         return syscall(__NR_gettid);
  56 }
  57 #else
  58 #warning "use pid as tid"
  59 static inline pid_t gettid(void)
  60 {
  61         return getpid();
  62 }
  63 #endif
  64
  65 static volatile int test_go, test_stop;
  66
  67 static unsigned long rduration;
  68
  69 static unsigned long duration;
  70
  71 /* read-side C.S. duration, in loops */
  72 static unsigned long wdelay;
  73
  74 static inline void loop_sleep(unsigned long l)
  75 {
  76         while(l-- != 0)
  77                 caa_cpu_relax();
  78 }
  79
  80 static int verbose_mode;
  81
  82 #define printf_verbose(fmt, args...)            \
  83         do {                                    \
  84                 if (verbose_mode)               \
  85                         printf(fmt, args);      \
  86         } while (0)
  87
  88 static unsigned int cpu_affinities[NR_CPUS];
  89 static unsigned int next_aff = 0;
  90 static int use_affinity = 0;
  91
  92 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
  93
  94 #ifndef HAVE_CPU_SET_T
  95 typedef unsigned long cpu_set_t;
  96 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
  97 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
  98 #endif
  99
 100 static void set_affinity(void)
 101 {
 102         cpu_set_t mask;
 103         int cpu;
 104         int ret;
 105
 106         if (!use_affinity)
 107                 return;
 108
 109 #if HAVE_SCHED_SETAFFINITY
 110         ret = pthread_mutex_lock(&affinity_mutex);
 111         if (ret) {
 112                 perror("Error in pthread mutex lock");
 113                 exit(-1);
 114         }
 115         cpu = cpu_affinities[next_aff++];
 116         ret = pthread_mutex_unlock(&affinity_mutex);
 117         if (ret) {
 118                 perror("Error in pthread mutex unlock");
 119                 exit(-1);
 120         }
 121
 122         CPU_ZERO(&mask);
 123         CPU_SET(cpu, &mask);
 124 #if SCHED_SETAFFINITY_ARGS == 2
 125         sched_setaffinity(0, &mask);
 126 #else
 127         sched_setaffinity(0, sizeof(mask), &mask);
 128 #endif
 129 #endif /* HAVE_SCHED_SETAFFINITY */
 130 }
 131
 132 /*
 133  * returns 0 if test should end.
 134  */
 135 static int test_duration_dequeue(void)
 136 {
 137         return !test_stop;
 138 }
 139
 140 static int test_duration_enqueue(void)
 141 {
 142         return !test_stop;
 143 }
 144
 145 static unsigned long long __thread nr_dequeues;
 146 static unsigned long long __thread nr_enqueues;
 147
 148 static unsigned long long __thread nr_successful_dequeues;
 149 static unsigned long long __thread nr_successful_enqueues;
 150
 151 static unsigned int nr_enqueuers;
 152 static unsigned int nr_dequeuers;
 153
 154 pthread_mutex_t test_mutex = PTHREAD_MUTEX_INITIALIZER;
 155
 156 struct test {
 157         struct cds_list_head node;
 158 };
 159
 160 static CDS_LIST_HEAD(q);
 161
 162 static
 163 void test_mutex_lock(void)
 164 {
 165         int ret;
 166         ret = pthread_mutex_lock(&test_mutex);
 167         if (ret) {
 168                 perror("Error in pthread mutex lock");
 169                 exit(-1);
 170         }
 171 }
 172
 173 static
 174 void test_mutex_unlock(void)
 175 {
 176         int ret;
 177
 178         ret = pthread_mutex_unlock(&test_mutex);
 179         if (ret) {
 180                 perror("Error in pthread mutex unlock");
 181                 exit(-1);
 182         }
 183 }
 184
 185 void *thr_enqueuer(void *_count)
 186 {
 187         unsigned long long *count = _count;
 188
 189         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 190                         "enqueuer", pthread_self(), (unsigned long)gettid());
 191
 192         set_affinity();
 193
 194         while (!test_go)
 195         {
 196         }
 197         cmm_smp_mb();
 198
 199         for (;;) {
 200                 struct test *node = malloc(sizeof(*node));
 201                 if (!node)
 202                         goto fail;
 203                 test_mutex_lock();
 204                 cds_list_add(&node->node, &q);
 205                 test_mutex_unlock();
 206                 nr_successful_enqueues++;
 207
 208                 if (unlikely(wdelay))
 209                         loop_sleep(wdelay);
 210 fail:
 211                 nr_enqueues++;
 212                 if (unlikely(!test_duration_enqueue()))
 213                         break;
 214         }
 215
 216         count[0] = nr_enqueues;
 217         count[1] = nr_successful_enqueues;
 218         printf_verbose("enqueuer thread_end, thread id : %lx, tid %lu, "
 219                        "enqueues %llu successful_enqueues %llu\n",
 220                        pthread_self(), (unsigned long)gettid(), nr_enqueues,
 221                        nr_successful_enqueues);
 222         return ((void*)1);
 223
 224 }
 225
 226 void *thr_dequeuer(void *_count)
 227 {
 228         unsigned long long *count = _count;
 229         int ret;
 230
 231         printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
 232                         "dequeuer", pthread_self(), (unsigned long)gettid());
 233
 234         set_affinity();
 235
 236         while (!test_go)
 237         {
 238         }
 239         cmm_smp_mb();
 240
 241         for (;;) {
 242                 struct test *node;
 243
 244                 test_mutex_lock();
 245                 if (!cds_list_empty(&q)) {
 246                         node = cds_list_first_entry(&q, struct test, node);
 247                         cds_list_del(&node->node);
 248                 } else {
 249                         node = NULL;
 250                 }
 251                 test_mutex_unlock();
 252
 253                 if (node) {
 254                         free(node);
 255                         nr_successful_dequeues++;
 256                 }
 257
 258                 nr_dequeues++;
 259                 if (unlikely(!test_duration_dequeue()))
 260                         break;
 261                 if (unlikely(rduration))
 262                         loop_sleep(rduration);
 263         }
 264
 265         printf_verbose("dequeuer thread_end, thread id : %lx, tid %lu, "
 266                        "dequeues %llu, successful_dequeues %llu\n",
 267                        pthread_self(), (unsigned long)gettid(), nr_dequeues,
 268                        nr_successful_dequeues);
 269         count[0] = nr_dequeues;
 270         count[1] = nr_successful_dequeues;
 271         return ((void*)2);
 272 }
 273
 274 void test_end(unsigned long long *nr_dequeues)
 275 {
 276         struct test *node;
 277
 278         do {
 279                 if (!cds_list_empty(&q)) {
 280                         node = cds_list_first_entry(&q, struct test, node);
 281                 } else {
 282                         node = NULL;
 283                 }
 284                 if (node) {
 285                         cds_list_del(&node->node);
 286                         free(node);     /* no more concurrent access */
 287                         (*nr_dequeues)++;
 288                 }
 289         } while (node);
 290 }
 291
 292 void show_usage(int argc, char **argv)
 293 {
 294         printf("Usage : %s nr_dequeuers nr_enqueuers duration (s)", argv[0]);
 295         printf(" [-d delay] (enqueuer period (in loops))");
 296         printf(" [-c duration] (dequeuer period (in loops))");
 297         printf(" [-v] (verbose output)");
 298         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 299         printf("\n");
 300 }
 301
 302 int main(int argc, char **argv)
 303 {
 304         int err;
 305         pthread_t *tid_enqueuer, *tid_dequeuer;
 306         void *tret;
 307         unsigned long long *count_enqueuer, *count_dequeuer;
 308         unsigned long long tot_enqueues = 0, tot_dequeues = 0;
 309         unsigned long long tot_successful_enqueues = 0,
 310                            tot_successful_dequeues = 0;
 311         unsigned long long end_dequeues = 0;
 312         int i, a;
 313
 314         if (argc < 4) {
 315                 show_usage(argc, argv);
 316                 return -1;
 317         }
 318
 319         err = sscanf(argv[1], "%u", &nr_dequeuers);
 320         if (err != 1) {
 321                 show_usage(argc, argv);
 322                 return -1;
 323         }
 324
 325         err = sscanf(argv[2], "%u", &nr_enqueuers);
 326         if (err != 1) {
 327                 show_usage(argc, argv);
 328                 return -1;
 329         }
 330
 331         err = sscanf(argv[3], "%lu", &duration);
 332         if (err != 1) {
 333                 show_usage(argc, argv);
 334                 return -1;
 335         }
 336
 337         for (i = 4; i < argc; i++) {
 338                 if (argv[i][0] != '-')
 339                         continue;
 340                 switch (argv[i][1]) {
 341                 case 'a':
 342                         if (argc < i + 2) {
 343                                 show_usage(argc, argv);
 344                                 return -1;
 345                         }
 346                         a = atoi(argv[++i]);
 347                         cpu_affinities[next_aff++] = a;
 348                         use_affinity = 1;
 349                         printf_verbose("Adding CPU %d affinity\n", a);
 350                         break;
 351                 case 'c':
 352                         if (argc < i + 2) {
 353                                 show_usage(argc, argv);
 354                                 return -1;
 355                         }
 356                         rduration = atol(argv[++i]);
 357                         break;
 358                 case 'd':
 359                         if (argc < i + 2) {
 360                                 show_usage(argc, argv);
 361                                 return -1;
 362                         }
 363                         wdelay = atol(argv[++i]);
 364                         break;
 365                 case 'v':
 366                         verbose_mode = 1;
 367                         break;
 368                 }
 369         }
 370
 371         printf_verbose("running test for %lu seconds, %u enqueuers, "
 372                        "%u dequeuers.\n",
 373                        duration, nr_enqueuers, nr_dequeuers);
 374         printf_verbose("Writer delay : %lu loops.\n", rduration);
 375         printf_verbose("Reader duration : %lu loops.\n", wdelay);
 376         printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
 377                         "main", pthread_self(), (unsigned long)gettid());
 378
 379         tid_enqueuer = malloc(sizeof(*tid_enqueuer) * nr_enqueuers);
 380         tid_dequeuer = malloc(sizeof(*tid_dequeuer) * nr_dequeuers);
 381         count_enqueuer = malloc(2 * sizeof(*count_enqueuer) * nr_enqueuers);
 382         count_dequeuer = malloc(2 * sizeof(*count_dequeuer) * nr_dequeuers);
 383
 384         next_aff = 0;
 385
 386         for (i = 0; i < nr_enqueuers; i++) {
 387                 err = pthread_create(&tid_enqueuer[i], NULL, thr_enqueuer,
 388                                      &count_enqueuer[2 * i]);
 389                 if (err != 0)
 390                         exit(1);
 391         }
 392         for (i = 0; i < nr_dequeuers; i++) {
 393                 err = pthread_create(&tid_dequeuer[i], NULL, thr_dequeuer,
 394                                      &count_dequeuer[2 * i]);
 395                 if (err != 0)
 396                         exit(1);
 397         }
 398
 399         cmm_smp_mb();
 400
 401         test_go = 1;
 402
 403         for (i = 0; i < duration; i++) {
 404                 sleep(1);
 405                 if (verbose_mode)
 406                         write (1, ".", 1);
 407         }
 408
 409         test_stop = 1;
 410
 411         for (i = 0; i < nr_enqueuers; i++) {
 412                 err = pthread_join(tid_enqueuer[i], &tret);
 413                 if (err != 0)
 414                         exit(1);
 415                 tot_enqueues += count_enqueuer[2 * i];
 416                 tot_successful_enqueues += count_enqueuer[2 * i + 1];
 417         }
 418         for (i = 0; i < nr_dequeuers; i++) {
 419                 err = pthread_join(tid_dequeuer[i], &tret);
 420                 if (err != 0)
 421                         exit(1);
 422                 tot_dequeues += count_dequeuer[2 * i];
 423                 tot_successful_dequeues += count_dequeuer[2 * i + 1];
 424         }
 425
 426         test_end(&end_dequeues);
 427
 428         printf_verbose("total number of enqueues : %llu, dequeues %llu\n",
 429                        tot_enqueues, tot_dequeues);
 430         printf_verbose("total number of successful enqueues : %llu, "
 431                        "successful dequeues %llu\n",
 432                        tot_successful_enqueues, tot_successful_dequeues);
 433         printf("SUMMARY %-25s testdur %4lu nr_enqueuers %3u wdelay %6lu "
 434                 "nr_dequeuers %3u "
 435                 "rdur %6lu nr_enqueues %12llu nr_dequeues %12llu "
 436                 "successful enqueues %12llu successful dequeues %12llu "
 437                 "end_dequeues %llu nr_ops %12llu\n",
 438                 argv[0], duration, nr_enqueuers, wdelay,
 439                 nr_dequeuers, rduration, tot_enqueues, tot_dequeues,
 440                 tot_successful_enqueues,
 441                 tot_successful_dequeues, end_dequeues,
 442                 tot_enqueues + tot_dequeues);
 443         if (tot_successful_enqueues != tot_successful_dequeues + end_dequeues)
 444                 printf("WARNING! Discrepancy between nr succ. enqueues %llu vs "
 445                        "succ. dequeues + end dequeues %llu.\n",
 446                        tot_successful_enqueues,
 447                        tot_successful_dequeues + end_dequeues);
 448
 449         free(count_enqueuer);
 450         free(count_dequeuer);
 451         free(tid_enqueuer);
 452         free(tid_dequeuer);
 453         return 0;
 454 }