kernel/tools/testing/selftests/mqueue/mq_perf_tests.c

   1 /*
   2  * This application is Copyright 2012 Red Hat, Inc.
   3  *      Doug Ledford <dledford@redhat.com>
   4  *
   5  * mq_perf_tests is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, version 3.
   8  *
   9  * mq_perf_tests is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * For the full text of the license, see <http://www.gnu.org/licenses/>.
  15  *
  16  * mq_perf_tests.c
  17  *   Tests various types of message queue workloads, concentrating on those
  18  *   situations that invole large message sizes, large message queue depths,
  19  *   or both, and reports back useful metrics about kernel message queue
  20  *   performance.
  21  *
  22  */
  23 #define _GNU_SOURCE
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28 #include <string.h>
  29 #include <limits.h>
  30 #include <errno.h>
  31 #include <signal.h>
  32 #include <pthread.h>
  33 #include <sched.h>
  34 #include <sys/types.h>
  35 #include <sys/time.h>
  36 #include <sys/resource.h>
  37 #include <sys/stat.h>
  38 #include <mqueue.h>
  39 #include <popt.h>
  40
  41 static char *usage =
  42 "Usage:\n"
  43 "  %s [-c #[,#..] -f] path\n"
  44 "\n"
  45 "       -c #    Skip most tests and go straight to a high queue depth test\n"
  46 "               and then run that test continuously (useful for running at\n"
  47 "               the same time as some other workload to see how much the\n"
  48 "               cache thrashing caused by adding messages to a very deep\n"
  49 "               queue impacts the performance of other programs).  The number\n"
  50 "               indicates which CPU core we should bind the process to during\n"
  51 "               the run.  If you have more than one physical CPU, then you\n"
  52 "               will need one copy per physical CPU package, and you should\n"
  53 "               specify the CPU cores to pin ourself to via a comma separated\n"
  54 "               list of CPU values.\n"
  55 "       -f      Only usable with continuous mode.  Pin ourself to the CPUs\n"
  56 "               as requested, then instead of looping doing a high mq\n"
  57 "               workload, just busy loop.  This will allow us to lock up a\n"
  58 "               single CPU just like we normally would, but without actually\n"
  59 "               thrashing the CPU cache.  This is to make it easier to get\n"
  60 "               comparable numbers from some other workload running on the\n"
  61 "               other CPUs.  One set of numbers with # CPUs locked up running\n"
  62 "               an mq workload, and another set of numbers with those same\n"
  63 "               CPUs locked away from the test workload, but not doing\n"
  64 "               anything to trash the cache like the mq workload might.\n"
  65 "       path    Path name of the message queue to create\n"
  66 "\n"
  67 "       Note: this program must be run as root in order to enable all tests\n"
  68 "\n";
  69
  70 char *MAX_MSGS = "/proc/sys/fs/mqueue/msg_max";
  71 char *MAX_MSGSIZE = "/proc/sys/fs/mqueue/msgsize_max";
  72
  73 #define min(a, b) ((a) < (b) ? (a) : (b))
  74 #define MAX_CPUS 64
  75 char *cpu_option_string;
  76 int cpus_to_pin[MAX_CPUS];
  77 int num_cpus_to_pin;
  78 pthread_t cpu_threads[MAX_CPUS];
  79 pthread_t main_thread;
  80 cpu_set_t *cpu_set;
  81 int cpu_set_size;
  82 int cpus_online;
  83
  84 #define MSG_SIZE 16
  85 #define TEST1_LOOPS 10000000
  86 #define TEST2_LOOPS 100000
  87 int continuous_mode;
  88 int continuous_mode_fake;
  89
  90 struct rlimit saved_limits, cur_limits;
  91 int saved_max_msgs, saved_max_msgsize;
  92 int cur_max_msgs, cur_max_msgsize;
  93 FILE *max_msgs, *max_msgsize;
  94 int cur_nice;
  95 char *queue_path = "/mq_perf_tests";
  96 mqd_t queue = -1;
  97 struct mq_attr result;
  98 int mq_prio_max;
  99
 100 const struct poptOption options[] = {
 101         {
 102                 .longName = "continuous",
 103                 .shortName = 'c',
 104                 .argInfo = POPT_ARG_STRING,
 105                 .arg = &cpu_option_string,
 106                 .val = 'c',
 107                 .descrip = "Run continuous tests at a high queue depth in "
 108                         "order to test the effects of cache thrashing on "
 109                         "other tasks on the system.  This test is intended "
 110                         "to be run on one core of each physical CPU while "
 111                         "some other CPU intensive task is run on all the other "
 112                         "cores of that same physical CPU and the other task "
 113                         "is timed.  It is assumed that the process of adding "
 114                         "messages to the message queue in a tight loop will "
 115                         "impact that other task to some degree.  Once the "
 116                         "tests are performed in this way, you should then "
 117                         "re-run the tests using fake mode in order to check "
 118                         "the difference in time required to perform the CPU "
 119                         "intensive task",
 120                 .argDescrip = "cpu[,cpu]",
 121         },
 122         {
 123                 .longName = "fake",
 124                 .shortName = 'f',
 125                 .argInfo = POPT_ARG_NONE,
 126                 .arg = &continuous_mode_fake,
 127                 .val = 0,
 128                 .descrip = "Tie up the CPUs that we would normally tie up in"
 129                         "continuous mode, but don't actually do any mq stuff, "
 130                         "just keep the CPU busy so it can't be used to process "
 131                         "system level tasks as this would free up resources on "
 132                         "the other CPU cores and skew the comparison between "
 133                         "the no-mqueue work and mqueue work tests",
 134                 .argDescrip = NULL,
 135         },
 136         {
 137                 .longName = "path",
 138                 .shortName = 'p',
 139                 .argInfo = POPT_ARG_STRING | POPT_ARGFLAG_SHOW_DEFAULT,
 140                 .arg = &queue_path,
 141                 .val = 'p',
 142                 .descrip = "The name of the path to use in the mqueue "
 143                         "filesystem for our tests",
 144                 .argDescrip = "pathname",
 145         },
 146         POPT_AUTOHELP
 147         POPT_TABLEEND
 148 };
 149
 150 static inline void __set(FILE *stream, int value, char *err_msg);
 151 void shutdown(int exit_val, char *err_cause, int line_no);
 152 void sig_action_SIGUSR1(int signum, siginfo_t *info, void *context);
 153 void sig_action(int signum, siginfo_t *info, void *context);
 154 static inline int get(FILE *stream);
 155 static inline void set(FILE *stream, int value);
 156 static inline int try_set(FILE *stream, int value);
 157 static inline void getr(int type, struct rlimit *rlim);
 158 static inline void setr(int type, struct rlimit *rlim);
 159 static inline void open_queue(struct mq_attr *attr);
 160 void increase_limits(void);
 161
 162 static inline void __set(FILE *stream, int value, char *err_msg)
 163 {
 164         rewind(stream);
 165         if (fprintf(stream, "%d", value) < 0)
 166                 perror(err_msg);
 167 }
 168
 169
 170 void shutdown(int exit_val, char *err_cause, int line_no)
 171 {
 172         static int in_shutdown = 0;
 173         int errno_at_shutdown = errno;
 174         int i;
 175
 176         /* In case we get called by multiple threads or from an sighandler */
 177         if (in_shutdown++)
 178                 return;
 179
 180         for (i = 0; i < num_cpus_to_pin; i++)
 181                 if (cpu_threads[i]) {
 182                         pthread_kill(cpu_threads[i], SIGUSR1);
 183                         pthread_join(cpu_threads[i], NULL);
 184                 }
 185
 186         if (queue != -1)
 187                 if (mq_close(queue))
 188                         perror("mq_close() during shutdown");
 189         if (queue_path)
 190                 /*
 191                  * Be silent if this fails, if we cleaned up already it's
 192                  * expected to fail
 193                  */
 194                 mq_unlink(queue_path);
 195         if (saved_max_msgs)
 196                 __set(max_msgs, saved_max_msgs,
 197                       "failed to restore saved_max_msgs");
 198         if (saved_max_msgsize)
 199                 __set(max_msgsize, saved_max_msgsize,
 200                       "failed to restore saved_max_msgsize");
 201         if (exit_val)
 202                 error(exit_val, errno_at_shutdown, "%s at %d",
 203                       err_cause, line_no);
 204         exit(0);
 205 }
 206
 207 void sig_action_SIGUSR1(int signum, siginfo_t *info, void *context)
 208 {
 209         if (pthread_self() != main_thread)
 210                 pthread_exit(0);
 211         else {
 212                 fprintf(stderr, "Caught signal %d in SIGUSR1 handler, "
 213                                 "exiting\n", signum);
 214                 shutdown(0, "", 0);
 215                 fprintf(stderr, "\n\nReturned from shutdown?!?!\n\n");
 216                 exit(0);
 217         }
 218 }
 219
 220 void sig_action(int signum, siginfo_t *info, void *context)
 221 {
 222         if (pthread_self() != main_thread)
 223                 pthread_kill(main_thread, signum);
 224         else {
 225                 fprintf(stderr, "Caught signal %d, exiting\n", signum);
 226                 shutdown(0, "", 0);
 227                 fprintf(stderr, "\n\nReturned from shutdown?!?!\n\n");
 228                 exit(0);
 229         }
 230 }
 231
 232 static inline int get(FILE *stream)
 233 {
 234         int value;
 235         rewind(stream);
 236         if (fscanf(stream, "%d", &value) != 1)
 237                 shutdown(4, "Error reading /proc entry", __LINE__);
 238         return value;
 239 }
 240
 241 static inline void set(FILE *stream, int value)
 242 {
 243         int new_value;
 244
 245         rewind(stream);
 246         if (fprintf(stream, "%d", value) < 0)
 247                 return shutdown(5, "Failed writing to /proc file", __LINE__);
 248         new_value = get(stream);
 249         if (new_value != value)
 250                 return shutdown(5, "We didn't get what we wrote to /proc back",
 251                                 __LINE__);
 252 }
 253
 254 static inline int try_set(FILE *stream, int value)
 255 {
 256         int new_value;
 257
 258         rewind(stream);
 259         fprintf(stream, "%d", value);
 260         new_value = get(stream);
 261         return new_value == value;
 262 }
 263
 264 static inline void getr(int type, struct rlimit *rlim)
 265 {
 266         if (getrlimit(type, rlim))
 267                 shutdown(6, "getrlimit()", __LINE__);
 268 }
 269
 270 static inline void setr(int type, struct rlimit *rlim)
 271 {
 272         if (setrlimit(type, rlim))
 273                 shutdown(7, "setrlimit()", __LINE__);
 274 }
 275
 276 /**
 277  * open_queue - open the global queue for testing
 278  * @attr - An attr struct specifying the desired queue traits
 279  * @result - An attr struct that lists the actual traits the queue has
 280  *
 281  * This open is not allowed to fail, failure will result in an orderly
 282  * shutdown of the program.  The global queue_path is used to set what
 283  * queue to open, the queue descriptor is saved in the global queue
 284  * variable.
 285  */
 286 static inline void open_queue(struct mq_attr *attr)
 287 {
 288         int flags = O_RDWR | O_EXCL | O_CREAT | O_NONBLOCK;
 289         int perms = DEFFILEMODE;
 290
 291         queue = mq_open(queue_path, flags, perms, attr);
 292         if (queue == -1)
 293                 shutdown(1, "mq_open()", __LINE__);
 294         if (mq_getattr(queue, &result))
 295                 shutdown(1, "mq_getattr()", __LINE__);
 296         printf("\n\tQueue %s created:\n", queue_path);
 297         printf("\t\tmq_flags:\t\t\t%s\n", result.mq_flags & O_NONBLOCK ?
 298                "O_NONBLOCK" : "(null)");
 299         printf("\t\tmq_maxmsg:\t\t\t%lu\n", result.mq_maxmsg);
 300         printf("\t\tmq_msgsize:\t\t\t%lu\n", result.mq_msgsize);
 301         printf("\t\tmq_curmsgs:\t\t\t%lu\n", result.mq_curmsgs);
 302 }
 303
 304 void *fake_cont_thread(void *arg)
 305 {
 306         int i;
 307
 308         for (i = 0; i < num_cpus_to_pin; i++)
 309                 if (cpu_threads[i] == pthread_self())
 310                         break;
 311         printf("\tStarted fake continuous mode thread %d on CPU %d\n", i,
 312                cpus_to_pin[i]);
 313         while (1)
 314                 ;
 315 }
 316
 317 void *cont_thread(void *arg)
 318 {
 319         char buff[MSG_SIZE];
 320         int i, priority;
 321
 322         for (i = 0; i < num_cpus_to_pin; i++)
 323                 if (cpu_threads[i] == pthread_self())
 324                         break;
 325         printf("\tStarted continuous mode thread %d on CPU %d\n", i,
 326                cpus_to_pin[i]);
 327         while (1) {
 328                 while (mq_send(queue, buff, sizeof(buff), 0) == 0)
 329                         ;
 330                 mq_receive(queue, buff, sizeof(buff), &priority);
 331         }
 332 }
 333
 334 #define drain_queue() \
 335         while (mq_receive(queue, buff, MSG_SIZE, &prio_in) == MSG_SIZE)
 336
 337 #define do_untimed_send() \
 338         do { \
 339                 if (mq_send(queue, buff, MSG_SIZE, prio_out)) \
 340                         shutdown(3, "Test send failure", __LINE__); \
 341         } while (0)
 342
 343 #define do_send_recv() \
 344         do { \
 345                 clock_gettime(clock, &start); \
 346                 if (mq_send(queue, buff, MSG_SIZE, prio_out)) \
 347                         shutdown(3, "Test send failure", __LINE__); \
 348                 clock_gettime(clock, &middle); \
 349                 if (mq_receive(queue, buff, MSG_SIZE, &prio_in) != MSG_SIZE) \
 350                         shutdown(3, "Test receive failure", __LINE__); \
 351                 clock_gettime(clock, &end); \
 352                 nsec = ((middle.tv_sec - start.tv_sec) * 1000000000) + \
 353                         (middle.tv_nsec - start.tv_nsec); \
 354                 send_total.tv_nsec += nsec; \
 355                 if (send_total.tv_nsec >= 1000000000) { \
 356                         send_total.tv_sec++; \
 357                         send_total.tv_nsec -= 1000000000; \
 358                 } \
 359                 nsec = ((end.tv_sec - middle.tv_sec) * 1000000000) + \
 360                         (end.tv_nsec - middle.tv_nsec); \
 361                 recv_total.tv_nsec += nsec; \
 362                 if (recv_total.tv_nsec >= 1000000000) { \
 363                         recv_total.tv_sec++; \
 364                         recv_total.tv_nsec -= 1000000000; \
 365                 } \
 366         } while (0)
 367
 368 struct test {
 369         char *desc;
 370         void (*func)(int *);
 371 };
 372
 373 void const_prio(int *prio)
 374 {
 375         return;
 376 }
 377
 378 void inc_prio(int *prio)
 379 {
 380         if (++*prio == mq_prio_max)
 381                 *prio = 0;
 382 }
 383
 384 void dec_prio(int *prio)
 385 {
 386         if (--*prio < 0)
 387                 *prio = mq_prio_max - 1;
 388 }
 389
 390 void random_prio(int *prio)
 391 {
 392         *prio = random() % mq_prio_max;
 393 }
 394
 395 struct test test2[] = {
 396         {"\n\tTest #2a: Time send/recv message, queue full, constant prio\n",
 397                 const_prio},
 398         {"\n\tTest #2b: Time send/recv message, queue full, increasing prio\n",
 399                 inc_prio},
 400         {"\n\tTest #2c: Time send/recv message, queue full, decreasing prio\n",
 401                 dec_prio},
 402         {"\n\tTest #2d: Time send/recv message, queue full, random prio\n",
 403                 random_prio},
 404         {NULL, NULL}
 405 };
 406
 407 /**
 408  * Tests to perform (all done with MSG_SIZE messages):
 409  *
 410  * 1) Time to add/remove message with 0 messages on queue
 411  * 1a) with constant prio
 412  * 2) Time to add/remove message when queue close to capacity:
 413  * 2a) with constant prio
 414  * 2b) with increasing prio
 415  * 2c) with decreasing prio
 416  * 2d) with random prio
 417  * 3) Test limits of priorities honored (double check _SC_MQ_PRIO_MAX)
 418  */
 419 void *perf_test_thread(void *arg)
 420 {
 421         char buff[MSG_SIZE];
 422         int prio_out, prio_in;
 423         int i;
 424         clockid_t clock;
 425         pthread_t *t;
 426         struct timespec res, start, middle, end, send_total, recv_total;
 427         unsigned long long nsec;
 428         struct test *cur_test;
 429
 430         t = &cpu_threads[0];
 431         printf("\n\tStarted mqueue performance test thread on CPU %d\n",
 432                cpus_to_pin[0]);
 433         mq_prio_max = sysconf(_SC_MQ_PRIO_MAX);
 434         if (mq_prio_max == -1)
 435                 shutdown(2, "sysconf(_SC_MQ_PRIO_MAX)", __LINE__);
 436         if (pthread_getcpuclockid(cpu_threads[0], &clock) != 0)
 437                 shutdown(2, "pthread_getcpuclockid", __LINE__);
 438
 439         if (clock_getres(clock, &res))
 440                 shutdown(2, "clock_getres()", __LINE__);
 441
 442         printf("\t\tMax priorities:\t\t\t%d\n", mq_prio_max);
 443         printf("\t\tClock resolution:\t\t%lu nsec%s\n", res.tv_nsec,
 444                res.tv_nsec > 1 ? "s" : "");
 445
 446
 447
 448         printf("\n\tTest #1: Time send/recv message, queue empty\n");
 449         printf("\t\t(%d iterations)\n", TEST1_LOOPS);
 450         prio_out = 0;
 451         send_total.tv_sec = 0;
 452         send_total.tv_nsec = 0;
 453         recv_total.tv_sec = 0;
 454         recv_total.tv_nsec = 0;
 455         for (i = 0; i < TEST1_LOOPS; i++)
 456                 do_send_recv();
 457         printf("\t\tSend msg:\t\t\t%ld.%lus total time\n",
 458                send_total.tv_sec, send_total.tv_nsec);
 459         nsec = ((unsigned long long)send_total.tv_sec * 1000000000 +
 460                  send_total.tv_nsec) / TEST1_LOOPS;
 461         printf("\t\t\t\t\t\t%lld nsec/msg\n", nsec);
 462         printf("\t\tRecv msg:\t\t\t%ld.%lus total time\n",
 463                recv_total.tv_sec, recv_total.tv_nsec);
 464         nsec = ((unsigned long long)recv_total.tv_sec * 1000000000 +
 465                 recv_total.tv_nsec) / TEST1_LOOPS;
 466         printf("\t\t\t\t\t\t%lld nsec/msg\n", nsec);
 467
 468
 469         for (cur_test = test2; cur_test->desc != NULL; cur_test++) {
 470                 printf("%s:\n", cur_test->desc);
 471                 printf("\t\t(%d iterations)\n", TEST2_LOOPS);
 472                 prio_out = 0;
 473                 send_total.tv_sec = 0;
 474                 send_total.tv_nsec = 0;
 475                 recv_total.tv_sec = 0;
 476                 recv_total.tv_nsec = 0;
 477                 printf("\t\tFilling queue...");
 478                 fflush(stdout);
 479                 clock_gettime(clock, &start);
 480                 for (i = 0; i < result.mq_maxmsg - 1; i++) {
 481                         do_untimed_send();
 482                         cur_test->func(&prio_out);
 483                 }
 484                 clock_gettime(clock, &end);
 485                 nsec = ((unsigned long long)(end.tv_sec - start.tv_sec) *
 486                         1000000000) + (end.tv_nsec - start.tv_nsec);
 487                 printf("done.\t\t%lld.%llds\n", nsec / 1000000000,
 488                        nsec % 1000000000);
 489                 printf("\t\tTesting...");
 490                 fflush(stdout);
 491                 for (i = 0; i < TEST2_LOOPS; i++) {
 492                         do_send_recv();
 493                         cur_test->func(&prio_out);
 494                 }
 495                 printf("done.\n");
 496                 printf("\t\tSend msg:\t\t\t%ld.%lus total time\n",
 497                        send_total.tv_sec, send_total.tv_nsec);
 498                 nsec = ((unsigned long long)send_total.tv_sec * 1000000000 +
 499                          send_total.tv_nsec) / TEST2_LOOPS;
 500                 printf("\t\t\t\t\t\t%lld nsec/msg\n", nsec);
 501                 printf("\t\tRecv msg:\t\t\t%ld.%lus total time\n",
 502                        recv_total.tv_sec, recv_total.tv_nsec);
 503                 nsec = ((unsigned long long)recv_total.tv_sec * 1000000000 +
 504                         recv_total.tv_nsec) / TEST2_LOOPS;
 505                 printf("\t\t\t\t\t\t%lld nsec/msg\n", nsec);
 506                 printf("\t\tDraining queue...");
 507                 fflush(stdout);
 508                 clock_gettime(clock, &start);
 509                 drain_queue();
 510                 clock_gettime(clock, &end);
 511                 nsec = ((unsigned long long)(end.tv_sec - start.tv_sec) *
 512                         1000000000) + (end.tv_nsec - start.tv_nsec);
 513                 printf("done.\t\t%lld.%llds\n", nsec / 1000000000,
 514                        nsec % 1000000000);
 515         }
 516         return 0;
 517 }
 518
 519 void increase_limits(void)
 520 {
 521         cur_limits.rlim_cur = RLIM_INFINITY;
 522         cur_limits.rlim_max = RLIM_INFINITY;
 523         setr(RLIMIT_MSGQUEUE, &cur_limits);
 524         while (try_set(max_msgs, cur_max_msgs += 10))
 525                 ;
 526         cur_max_msgs = get(max_msgs);
 527         while (try_set(max_msgsize, cur_max_msgsize += 1024))
 528                 ;
 529         cur_max_msgsize = get(max_msgsize);
 530         if (setpriority(PRIO_PROCESS, 0, -20) != 0)
 531                 shutdown(2, "setpriority()", __LINE__);
 532         cur_nice = -20;
 533 }
 534
 535 int main(int argc, char *argv[])
 536 {
 537         struct mq_attr attr;
 538         char *option, *next_option;
 539         int i, cpu, rc;
 540         struct sigaction sa;
 541         poptContext popt_context;
 542         void *retval;
 543
 544         main_thread = pthread_self();
 545         num_cpus_to_pin = 0;
 546
 547         if (sysconf(_SC_NPROCESSORS_ONLN) == -1) {
 548                 perror("sysconf(_SC_NPROCESSORS_ONLN)");
 549                 exit(1);
 550         }
 551         cpus_online = min(MAX_CPUS, sysconf(_SC_NPROCESSORS_ONLN));
 552         cpu_set = CPU_ALLOC(cpus_online);
 553         if (cpu_set == NULL) {
 554                 perror("CPU_ALLOC()");
 555                 exit(1);
 556         }
 557         cpu_set_size = CPU_ALLOC_SIZE(cpus_online);
 558         CPU_ZERO_S(cpu_set_size, cpu_set);
 559
 560         popt_context = poptGetContext(NULL, argc, (const char **)argv,
 561                                       options, 0);
 562
 563         while ((rc = poptGetNextOpt(popt_context)) > 0) {
 564                 switch (rc) {
 565                 case 'c':
 566                         continuous_mode = 1;
 567                         option = cpu_option_string;
 568                         do {
 569                                 next_option = strchr(option, ',');
 570                                 if (next_option)
 571                                         *next_option = '\0';
 572                                 cpu = atoi(option);
 573                                 if (cpu >= cpus_online)
 574                                         fprintf(stderr, "CPU %d exceeds "
 575                                                 "cpus online, ignoring.\n",
 576                                                 cpu);
 577                                 else
 578                                         cpus_to_pin[num_cpus_to_pin++] = cpu;
 579                                 if (next_option)
 580                                         option = ++next_option;
 581                         } while (next_option && num_cpus_to_pin < MAX_CPUS);
 582                         /* Double check that they didn't give us the same CPU
 583                          * more than once */
 584                         for (cpu = 0; cpu < num_cpus_to_pin; cpu++) {
 585                                 if (CPU_ISSET_S(cpus_to_pin[cpu], cpu_set_size,
 586                                                 cpu_set)) {
 587                                         fprintf(stderr, "Any given CPU may "
 588                                                 "only be given once.\n");
 589                                         exit(1);
 590                                 } else
 591                                         CPU_SET_S(cpus_to_pin[cpu],
 592                                                   cpu_set_size, cpu_set);
 593                         }
 594                         break;
 595                 case 'p':
 596                         /*
 597                          * Although we can create a msg queue with a
 598                          * non-absolute path name, unlink will fail.  So,
 599                          * if the name doesn't start with a /, add one
 600                          * when we save it.
 601                          */
 602                         option = queue_path;
 603                         if (*option != '/') {
 604                                 queue_path = malloc(strlen(option) + 2);
 605                                 if (!queue_path) {
 606                                         perror("malloc()");
 607                                         exit(1);
 608                                 }
 609                                 queue_path[0] = '/';
 610                                 queue_path[1] = 0;
 611                                 strcat(queue_path, option);
 612                                 free(option);
 613                         }
 614                         break;
 615                 }
 616         }
 617
 618         if (continuous_mode && num_cpus_to_pin == 0) {
 619                 fprintf(stderr, "Must pass at least one CPU to continuous "
 620                         "mode.\n");
 621                 poptPrintUsage(popt_context, stderr, 0);
 622                 exit(1);
 623         } else if (!continuous_mode) {
 624                 num_cpus_to_pin = 1;
 625                 cpus_to_pin[0] = cpus_online - 1;
 626         }
 627
 628         if (getuid() != 0) {
 629                 fprintf(stderr, "Not running as root, but almost all tests "
 630                         "require root in order to modify\nsystem settings.  "
 631                         "Exiting.\n");
 632                 exit(1);
 633         }
 634
 635         max_msgs = fopen(MAX_MSGS, "r+");
 636         max_msgsize = fopen(MAX_MSGSIZE, "r+");
 637         if (!max_msgs)
 638                 shutdown(2, "Failed to open msg_max", __LINE__);
 639         if (!max_msgsize)
 640                 shutdown(2, "Failed to open msgsize_max", __LINE__);
 641
 642         /* Load up the current system values for everything we can */
 643         getr(RLIMIT_MSGQUEUE, &saved_limits);
 644         cur_limits = saved_limits;
 645         saved_max_msgs = cur_max_msgs = get(max_msgs);
 646         saved_max_msgsize = cur_max_msgsize = get(max_msgsize);
 647         errno = 0;
 648         cur_nice = getpriority(PRIO_PROCESS, 0);
 649         if (errno)
 650                 shutdown(2, "getpriority()", __LINE__);
 651
 652         /* Tell the user our initial state */
 653         printf("\nInitial system state:\n");
 654         printf("\tUsing queue path:\t\t\t%s\n", queue_path);
 655         printf("\tRLIMIT_MSGQUEUE(soft):\t\t\t%ld\n",
 656                 (long) saved_limits.rlim_cur);
 657         printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t%ld\n",
 658                 (long) saved_limits.rlim_max);
 659         printf("\tMaximum Message Size:\t\t\t%d\n", saved_max_msgsize);
 660         printf("\tMaximum Queue Size:\t\t\t%d\n", saved_max_msgs);
 661         printf("\tNice value:\t\t\t\t%d\n", cur_nice);
 662         printf("\n");
 663
 664         increase_limits();
 665
 666         printf("Adjusted system state for testing:\n");
 667         if (cur_limits.rlim_cur == RLIM_INFINITY) {
 668                 printf("\tRLIMIT_MSGQUEUE(soft):\t\t\t(unlimited)\n");
 669                 printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t(unlimited)\n");
 670         } else {
 671                 printf("\tRLIMIT_MSGQUEUE(soft):\t\t\t%ld\n",
 672                        (long) cur_limits.rlim_cur);
 673                 printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t%ld\n",
 674                        (long) cur_limits.rlim_max);
 675         }
 676         printf("\tMaximum Message Size:\t\t\t%d\n", cur_max_msgsize);
 677         printf("\tMaximum Queue Size:\t\t\t%d\n", cur_max_msgs);
 678         printf("\tNice value:\t\t\t\t%d\n", cur_nice);
 679         printf("\tContinuous mode:\t\t\t(%s)\n", continuous_mode ?
 680                (continuous_mode_fake ? "fake mode" : "enabled") :
 681                "disabled");
 682         printf("\tCPUs to pin:\t\t\t\t%d", cpus_to_pin[0]);
 683         for (cpu = 1; cpu < num_cpus_to_pin; cpu++)
 684                         printf(",%d", cpus_to_pin[cpu]);
 685         printf("\n");
 686
 687         sa.sa_sigaction = sig_action_SIGUSR1;
 688         sigemptyset(&sa.sa_mask);
 689         sigaddset(&sa.sa_mask, SIGHUP);
 690         sigaddset(&sa.sa_mask, SIGINT);
 691         sigaddset(&sa.sa_mask, SIGQUIT);
 692         sigaddset(&sa.sa_mask, SIGTERM);
 693         sa.sa_flags = SA_SIGINFO;
 694         if (sigaction(SIGUSR1, &sa, NULL) == -1)
 695                 shutdown(1, "sigaction(SIGUSR1)", __LINE__);
 696         sa.sa_sigaction = sig_action;
 697         if (sigaction(SIGHUP, &sa, NULL) == -1)
 698                 shutdown(1, "sigaction(SIGHUP)", __LINE__);
 699         if (sigaction(SIGINT, &sa, NULL) == -1)
 700                 shutdown(1, "sigaction(SIGINT)", __LINE__);
 701         if (sigaction(SIGQUIT, &sa, NULL) == -1)
 702                 shutdown(1, "sigaction(SIGQUIT)", __LINE__);
 703         if (sigaction(SIGTERM, &sa, NULL) == -1)
 704                 shutdown(1, "sigaction(SIGTERM)", __LINE__);
 705
 706         if (!continuous_mode_fake) {
 707                 attr.mq_flags = O_NONBLOCK;
 708                 attr.mq_maxmsg = cur_max_msgs;
 709                 attr.mq_msgsize = MSG_SIZE;
 710                 open_queue(&attr);
 711         }
 712         for (i = 0; i < num_cpus_to_pin; i++) {
 713                 pthread_attr_t thread_attr;
 714                 void *thread_func;
 715
 716                 if (continuous_mode_fake)
 717                         thread_func = &fake_cont_thread;
 718                 else if (continuous_mode)
 719                         thread_func = &cont_thread;
 720                 else
 721                         thread_func = &perf_test_thread;
 722
 723                 CPU_ZERO_S(cpu_set_size, cpu_set);
 724                 CPU_SET_S(cpus_to_pin[i], cpu_set_size, cpu_set);
 725                 pthread_attr_init(&thread_attr);
 726                 pthread_attr_setaffinity_np(&thread_attr, cpu_set_size,
 727                                             cpu_set);
 728                 if (pthread_create(&cpu_threads[i], &thread_attr, thread_func,
 729                                    NULL))
 730                         shutdown(1, "pthread_create()", __LINE__);
 731                 pthread_attr_destroy(&thread_attr);
 732         }
 733
 734         if (!continuous_mode) {
 735                 pthread_join(cpu_threads[0], &retval);
 736                 shutdown((long)retval, "perf_test_thread()", __LINE__);
 737         } else {
 738                 while (1)
 739                         sleep(1);
 740         }
 741         shutdown(0, "", 0);
 742 }