Quelle  mq_perf_tests.c   Sprache: C

/*
 * This application is Copyright 2012 Red Hat, Inc.
 * Doug Ledford <dledford@redhat.com>
 *
 * mq_perf_tests is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * mq_perf_tests is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * For the full text of the license, see <http://www.gnu.org/licenses/>.
 *
 * mq_perf_tests.c
 *   Tests various types of message queue workloads, concentrating on those
 *   situations that invole large message sizes, large message queue depths,
 *   or both, and reports back useful metrics about kernel message queue
 *   performance.
 *
 */
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
#include <signal.h>
#include <pthread.h>
#include <sched.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <mqueue.h>
#include <popt.h>
#include <error.h>

#include "../kselftest.h"

static char *usage =
"Usage:\n"
" %s [-c #[,#..] -f] path\n"
"\n"
" -c # Skip most tests and go straight to a high queue depth test\n"
" and then run that test continuously (useful for running at\n"
" the same time as some other workload to see how much the\n"
" cache thrashing caused by adding messages to a very deep\n"
" queue impacts the performance of other programs). The number\n"
" indicates which CPU core we should bind the process to during\n"
" the run. If you have more than one physical CPU, then you\n"
" will need one copy per physical CPU package, and you should\n"
" specify the CPU cores to pin ourself to via a comma separated\n"
" list of CPU values.\n"
" -f Only usable with continuous mode. Pin ourself to the CPUs\n"
" as requested, then instead of looping doing a high mq\n"
" workload, just busy loop. This will allow us to lock up a\n"
" single CPU just like we normally would, but without actually\n"
" thrashing the CPU cache. This is to make it easier to get\n"
" comparable numbers from some other workload running on the\n"
" other CPUs. One set of numbers with # CPUs locked up running\n"
" an mq workload, and another set of numbers with those same\n"
" CPUs locked away from the test workload, but not doing\n"
" anything to trash the cache like the mq workload might.\n"
" path Path name of the message queue to create\n"
"\n"
" Note: this program must be run as root in order to enable all tests\n"
"\n";

char *MAX_MSGS = "/proc/sys/fs/mqueue/msg_max";
char *MAX_MSGSIZE = "/proc/sys/fs/mqueue/msgsize_max";

#define MAX_CPUS 64
char *cpu_option_string;
int cpus_to_pin[MAX_CPUS];
int num_cpus_to_pin;
pthread_t cpu_threads[MAX_CPUS];
pthread_t main_thread;
cpu_set_t *cpu_set;
int cpu_set_size;
int cpus_online;

#define MSG_SIZE 16
#define TEST1_LOOPS 10000000
#define TEST2_LOOPS 100000
int continuous_mode;
int continuous_mode_fake;

struct rlimit saved_limits, cur_limits;
int saved_max_msgs, saved_max_msgsize;
int cur_max_msgs, cur_max_msgsize;
FILE *max_msgs, *max_msgsize;
int cur_nice;
char *queue_path = "/mq_perf_tests";
mqd_t queue = -1;
struct mq_attr result;
int mq_prio_max;

const struct poptOption options[] = {
 {
  .longName = "continuous",
  .shortName = 'c',
  .argInfo = POPT_ARG_STRING,
  .arg = &cpu_option_string,
  .val = 'c',
  .descrip = "Run continuous tests at a high queue depth in "
   "order to test the effects of cache thrashing on "
   "other tasks on the system. This test is intended "
   "to be run on one core of each physical CPU while "
   "some other CPU intensive task is run on all the other "
   "cores of that same physical CPU and the other task "
   "is timed. It is assumed that the process of adding "
   "messages to the message queue in a tight loop will "
   "impact that other task to some degree. Once the "
   "tests are performed in this way, you should then "
   "re-run the tests using fake mode in order to check "
   "the difference in time required to perform the CPU "
   "intensive task",
  .argDescrip = "cpu[,cpu]",
 },
 {
  .longName = "fake",
  .shortName = 'f',
  .argInfo = POPT_ARG_NONE,
  .arg = &continuous_mode_fake,
  .val = 0,
  .descrip = "Tie up the CPUs that we would normally tie up in"
   "continuous mode, but don't actually do any mq stuff, "
   "just keep the CPU busy so it can't be used to process "
   "system level tasks as this would free up resources on "
   "the other CPU cores and skew the comparison between "
   "the no-mqueue work and mqueue work tests",
  .argDescrip = NULL,
 },
 {
  .longName = "path",
  .shortName = 'p',
  .argInfo = POPT_ARG_STRING | POPT_ARGFLAG_SHOW_DEFAULT,
  .arg = &queue_path,
  .val = 'p',
  .descrip = "The name of the path to use in the mqueue "
   "filesystem for our tests",
  .argDescrip = "pathname",
 },
 POPT_AUTOHELP
 POPT_TABLEEND
};

static inline void __set(FILE *stream, int value, char *err_msg);
void shutdown(int exit_val, char *err_cause, int line_no);
void sig_action_SIGUSR1(int signum, siginfo_t *info, void *context);
void sig_action(int signum, siginfo_t *info, void *context);
static inline int get(FILE *stream);
static inline void set(FILE *stream, int value);
static inline int try_set(FILE *stream, int value);
static inline void getr(int type, struct rlimit *rlim);
static inline void setr(int type, struct rlimit *rlim);
static inline void open_queue(struct mq_attr *attr);
void increase_limits(void);

static inline void __set(FILE *stream, int value, char *err_msg)
{
 rewind(stream);
 if (fprintf(stream, "%d", value) < 0)
  perror(err_msg);
}


void shutdown(int exit_val, char *err_cause, int line_no)
{
 static int in_shutdown = 0;
 int errno_at_shutdown = errno;
 int i;

 /* In case we get called by multiple threads or from an sighandler */
 if (in_shutdown++)
  return;

 /* Free the cpu_set allocated using CPU_ALLOC in main function */
 CPU_FREE(cpu_set);

 for (i = 0; i < num_cpus_to_pin; i++)
  if (cpu_threads[i]) {
   pthread_kill(cpu_threads[i], SIGUSR1);
   pthread_join(cpu_threads[i], NULL);
  }

 if (queue != -1)
  if (mq_close(queue))
   perror("mq_close() during shutdown");
 if (queue_path)
  /*
 * Be silent if this fails, if we cleaned up already it's
 * expected to fail
 */
  mq_unlink(queue_path);
 if (saved_max_msgs)
  __set(max_msgs, saved_max_msgs,
        "failed to restore saved_max_msgs");
 if (saved_max_msgsize)
  __set(max_msgsize, saved_max_msgsize,
        "failed to restore saved_max_msgsize");
 if (exit_val)
  error(exit_val, errno_at_shutdown, "%s at %d",
        err_cause, line_no);
 exit(0);
}

void sig_action_SIGUSR1(int signum, siginfo_t *info, void *context)
{
 if (pthread_self() != main_thread)
  pthread_exit(0);
 else {
  fprintf(stderr, "Caught signal %d in SIGUSR1 handler, "
    "exiting\n", signum);
  shutdown(0, "", 0);
  fprintf(stderr, "\n\nReturned from shutdown?!?!\n\n");
  exit(0);
 }
}

void sig_action(int signum, siginfo_t *info, void *context)
{
 if (pthread_self() != main_thread)
  pthread_kill(main_thread, signum);
 else {
  fprintf(stderr, "Caught signal %d, exiting\n", signum);
  shutdown(0, "", 0);
  fprintf(stderr, "\n\nReturned from shutdown?!?!\n\n");
  exit(0);
 }
}

static inline int get(FILE *stream)
{
 int value;
 rewind(stream);
 if (fscanf(stream, "%d", &value) != 1)
  shutdown(4, "Error reading /proc entry", __LINE__);
 return value;
}

static inline void set(FILE *stream, int value)
{
 int new_value;

 rewind(stream);
 if (fprintf(stream, "%d", value) < 0)
  return shutdown(5, "Failed writing to /proc file", __LINE__);
 new_value = get(stream);
 if (new_value != value)
  return shutdown(5, "We didn't get what we wrote to /proc back",
    __LINE__);
}

static inline int try_set(FILE *stream, int value)
{
 int new_value;

 rewind(stream);
 fprintf(stream, "%d", value);
 new_value = get(stream);
 return new_value == value;
}

static inline void getr(int type, struct rlimit *rlim)
{
 if (getrlimit(type, rlim))
  shutdown(6, "getrlimit()", __LINE__);
}

static inline void setr(int type, struct rlimit *rlim)
{
 if (setrlimit(type, rlim))
  shutdown(7, "setrlimit()", __LINE__);
}

/**
 * open_queue - open the global queue for testing
 * @attr - An attr struct specifying the desired queue traits
 * @result - An attr struct that lists the actual traits the queue has
 *
 * This open is not allowed to fail, failure will result in an orderly
 * shutdown of the program.  The global queue_path is used to set what
 * queue to open, the queue descriptor is saved in the global queue
 * variable.
 */
static inline void open_queue(struct mq_attr *attr)
{
 int flags = O_RDWR | O_EXCL | O_CREAT | O_NONBLOCK;
 int perms = DEFFILEMODE;

 queue = mq_open(queue_path, flags, perms, attr);
 if (queue == -1)
  shutdown(1, "mq_open()", __LINE__);
 if (mq_getattr(queue, &result))
  shutdown(1, "mq_getattr()", __LINE__);
 printf("\n\tQueue %s created:\n", queue_path);
 printf("\t\tmq_flags:\t\t\t%s\n", result.mq_flags & O_NONBLOCK ?
        "O_NONBLOCK" : "(null)");
 printf("\t\tmq_maxmsg:\t\t\t%lu\n", result.mq_maxmsg);
 printf("\t\tmq_msgsize:\t\t\t%lu\n", result.mq_msgsize);
 printf("\t\tmq_curmsgs:\t\t\t%lu\n", result.mq_curmsgs);
}

void *fake_cont_thread(void *arg)
{
 int i;

 for (i = 0; i < num_cpus_to_pin; i++)
  if (cpu_threads[i] == pthread_self())
   break;
 printf("\tStarted fake continuous mode thread %d on CPU %d\n", i,
        cpus_to_pin[i]);
 while (1)
  ;
}

void *cont_thread(void *arg)
{
 char buff[MSG_SIZE];
 int i;
 unsigned int priority;

 for (i = 0; i < num_cpus_to_pin; i++)
  if (cpu_threads[i] == pthread_self())
   break;
 printf("\tStarted continuous mode thread %d on CPU %d\n", i,
        cpus_to_pin[i]);
 while (1) {
  while (mq_send(queue, buff, sizeof(buff), 0) == 0)
   ;
  mq_receive(queue, buff, sizeof(buff), &priority);
 }
}

#define drain_queue() \
 while (mq_receive(queue, buff, MSG_SIZE, &prio_in) == MSG_SIZE)

#define do_untimed_send() \
 do { \
  if (mq_send(queue, buff, MSG_SIZE, prio_out)) \
   shutdown(3, "Test send failure", __LINE__); \
 } while (0)

#define do_send_recv() \
 do { \
  clock_gettime(clock, &start); \
  if (mq_send(queue, buff, MSG_SIZE, prio_out)) \
   shutdown(3, "Test send failure", __LINE__); \
  clock_gettime(clock, &middle); \
  if (mq_receive(queue, buff, MSG_SIZE, &prio_in) != MSG_SIZE) \
   shutdown(3, "Test receive failure", __LINE__); \
  clock_gettime(clock, &end); \
  nsec = ((middle.tv_sec - start.tv_sec) * 1000000000) + \
   (middle.tv_nsec - start.tv_nsec); \
  send_total.tv_nsec += nsec; \
  if (send_total.tv_nsec >= 1000000000) { \
   send_total.tv_sec++; \
   send_total.tv_nsec -= 1000000000; \
  } \
  nsec = ((end.tv_sec - middle.tv_sec) * 1000000000) + \
   (end.tv_nsec - middle.tv_nsec); \
  recv_total.tv_nsec += nsec; \
  if (recv_total.tv_nsec >= 1000000000) { \
   recv_total.tv_sec++; \
   recv_total.tv_nsec -= 1000000000; \
  } \
 } while (0)

struct test {
 char *desc;
 void (*func)(int *);
};

void const_prio(int *prio)
{
 return;
}

void inc_prio(int *prio)
{
 if (++*prio == mq_prio_max)
  *prio = 0;
}

void dec_prio(int *prio)
{
 if (--*prio < 0)
  *prio = mq_prio_max - 1;
}

void random_prio(int *prio)
{
 *prio = random() % mq_prio_max;
}

struct test test2[] = {
 {"\n\tTest #2a: Time send/recv message, queue full, constant prio\n",
  const_prio},
 {"\n\tTest #2b: Time send/recv message, queue full, increasing prio\n",
  inc_prio},
 {"\n\tTest #2c: Time send/recv message, queue full, decreasing prio\n",
  dec_prio},
 {"\n\tTest #2d: Time send/recv message, queue full, random prio\n",
  random_prio},
 {NULL, NULL}
};

/**
 * Tests to perform (all done with MSG_SIZE messages):
 *
 * 1) Time to add/remove message with 0 messages on queue
 * 1a) with constant prio
 * 2) Time to add/remove message when queue close to capacity:
 * 2a) with constant prio
 * 2b) with increasing prio
 * 2c) with decreasing prio
 * 2d) with random prio
 * 3) Test limits of priorities honored (double check _SC_MQ_PRIO_MAX)
 */
void *perf_test_thread(void *arg)
{
 char buff[MSG_SIZE];
 int prio_out;
 unsigned int prio_in;
 int i;
 clockid_t clock;
 pthread_t *t;
 struct timespec res, start, middle, end, send_total, recv_total;
 unsigned long long nsec;
 struct test *cur_test;

 t = &cpu_threads[0];
 printf("\n\tStarted mqueue performance test thread on CPU %d\n",
        cpus_to_pin[0]);
 mq_prio_max = sysconf(_SC_MQ_PRIO_MAX);
 if (mq_prio_max == -1)
  shutdown(2, "sysconf(_SC_MQ_PRIO_MAX)", __LINE__);
 if (pthread_getcpuclockid(cpu_threads[0], &clock) != 0)
  shutdown(2, "pthread_getcpuclockid", __LINE__);

 if (clock_getres(clock, &res))
  shutdown(2, "clock_getres()", __LINE__);

 printf("\t\tMax priorities:\t\t\t%d\n", mq_prio_max);
 printf("\t\tClock resolution:\t\t%lu nsec%s\n", res.tv_nsec,
        res.tv_nsec > 1 ? "s" : "");



 printf("\n\tTest #1: Time send/recv message, queue empty\n");
 printf("\t\t(%d iterations)\n", TEST1_LOOPS);
 prio_out = 0;
 send_total.tv_sec = 0;
 send_total.tv_nsec = 0;
 recv_total.tv_sec = 0;
 recv_total.tv_nsec = 0;
 for (i = 0; i < TEST1_LOOPS; i++)
  do_send_recv();
 printf("\t\tSend msg:\t\t\t%ld.%lus total time\n",
        send_total.tv_sec, send_total.tv_nsec);
 nsec = ((unsigned long long)send_total.tv_sec * 1000000000 +
   send_total.tv_nsec) / TEST1_LOOPS;
 printf("\t\t\t\t\t\t%lld nsec/msg\n", nsec);
 printf("\t\tRecv msg:\t\t\t%ld.%lus total time\n",
        recv_total.tv_sec, recv_total.tv_nsec);
 nsec = ((unsigned long long)recv_total.tv_sec * 1000000000 +
  recv_total.tv_nsec) / TEST1_LOOPS;
 printf("\t\t\t\t\t\t%lld nsec/msg\n", nsec);


 for (cur_test = test2; cur_test->desc != NULL; cur_test++) {
  printf("%s:\n", cur_test->desc);
  printf("\t\t(%d iterations)\n", TEST2_LOOPS);
  prio_out = 0;
  send_total.tv_sec = 0;
  send_total.tv_nsec = 0;
  recv_total.tv_sec = 0;
  recv_total.tv_nsec = 0;
  printf("\t\tFilling queue...");
  fflush(stdout);
  clock_gettime(clock, &start);
  for (i = 0; i < result.mq_maxmsg - 1; i++) {
   do_untimed_send();
   cur_test->func(&prio_out);
  }
  clock_gettime(clock, &end);
  nsec = ((unsigned long long)(end.tv_sec - start.tv_sec) *
   1000000000) + (end.tv_nsec - start.tv_nsec);
  printf("done.\t\t%lld.%llds\n", nsec / 1000000000,
         nsec % 1000000000);
  printf("\t\tTesting...");
  fflush(stdout);
  for (i = 0; i < TEST2_LOOPS; i++) {
   do_send_recv();
   cur_test->func(&prio_out);
  }
  printf("done.\n");
  printf("\t\tSend msg:\t\t\t%ld.%lus total time\n",
         send_total.tv_sec, send_total.tv_nsec);
  nsec = ((unsigned long long)send_total.tv_sec * 1000000000 +
    send_total.tv_nsec) / TEST2_LOOPS;
  printf("\t\t\t\t\t\t%lld nsec/msg\n", nsec);
  printf("\t\tRecv msg:\t\t\t%ld.%lus total time\n",
         recv_total.tv_sec, recv_total.tv_nsec);
  nsec = ((unsigned long long)recv_total.tv_sec * 1000000000 +
   recv_total.tv_nsec) / TEST2_LOOPS;
  printf("\t\t\t\t\t\t%lld nsec/msg\n", nsec);
  printf("\t\tDraining queue...");
  fflush(stdout);
  clock_gettime(clock, &start);
  drain_queue();
  clock_gettime(clock, &end);
  nsec = ((unsigned long long)(end.tv_sec - start.tv_sec) *
   1000000000) + (end.tv_nsec - start.tv_nsec);
  printf("done.\t\t%lld.%llds\n", nsec / 1000000000,
         nsec % 1000000000);
 }
 return 0;
}

void increase_limits(void)
{
 cur_limits.rlim_cur = RLIM_INFINITY;
 cur_limits.rlim_max = RLIM_INFINITY;
 setr(RLIMIT_MSGQUEUE, &cur_limits);
 while (try_set(max_msgs, cur_max_msgs += 10))
  ;
 cur_max_msgs = get(max_msgs);
 while (try_set(max_msgsize, cur_max_msgsize += 1024))
  ;
 cur_max_msgsize = get(max_msgsize);
 if (setpriority(PRIO_PROCESS, 0, -20) != 0)
  shutdown(2, "setpriority()", __LINE__);
 cur_nice = -20;
}

int main(int argc, char *argv[])
{
 struct mq_attr attr;
 char *option, *next_option;
 int i, cpu, rc;
 struct sigaction sa;
 poptContext popt_context;
 void *retval;

 main_thread = pthread_self();
 num_cpus_to_pin = 0;

 if (sysconf(_SC_NPROCESSORS_ONLN) == -1) {
  perror("sysconf(_SC_NPROCESSORS_ONLN)");
  exit(1);
 }

 if (getuid() != 0)
  ksft_exit_skip("Not running as root, but almost all tests "
   "require root in order to modify\nsystem settings. "
   "Exiting.\n");

 cpus_online = MIN(MAX_CPUS, sysconf(_SC_NPROCESSORS_ONLN));
 cpu_set = CPU_ALLOC(cpus_online);
 if (cpu_set == NULL) {
  perror("CPU_ALLOC()");
  exit(1);
 }
 cpu_set_size = CPU_ALLOC_SIZE(cpus_online);
 CPU_ZERO_S(cpu_set_size, cpu_set);

 popt_context = poptGetContext(NULL, argc, (const char **)argv,
          options, 0);

 while ((rc = poptGetNextOpt(popt_context)) > 0) {
  switch (rc) {
  case 'c':
   continuous_mode = 1;
   option = cpu_option_string;
   do {
    next_option = strchr(option, ',');
    if (next_option)
     *next_option = '\0';
    cpu = atoi(option);
    if (cpu >= cpus_online)
     fprintf(stderr, "CPU %d exceeds "
      "cpus online, ignoring.\n",
      cpu);
    else
     cpus_to_pin[num_cpus_to_pin++] = cpu;
    if (next_option)
     option = ++next_option;
   } while (next_option && num_cpus_to_pin < MAX_CPUS);
   /* Double check that they didn't give us the same CPU
 * more than once */
   for (cpu = 0; cpu < num_cpus_to_pin; cpu++) {
    if (CPU_ISSET_S(cpus_to_pin[cpu], cpu_set_size,
      cpu_set)) {
     fprintf(stderr, "Any given CPU may "
      "only be given once.\n");
     goto err_code;
    } else
     CPU_SET_S(cpus_to_pin[cpu],
        cpu_set_size, cpu_set);
   }
   break;
  case 'p':
   /*
 * Although we can create a msg queue with a
 * non-absolute path name, unlink will fail.  So,
 * if the name doesn't start with a /, add one
 * when we save it.
 */
   option = queue_path;
   if (*option != '/') {
    queue_path = malloc(strlen(option) + 2);
    if (!queue_path) {
     perror("malloc()");
     goto err_code;
    }
    queue_path[0] = '/';
    queue_path[1] = 0;
    strcat(queue_path, option);
    free(option);
   }
   break;
  }
 }

 if (continuous_mode && num_cpus_to_pin == 0) {
  fprintf(stderr, "Must pass at least one CPU to continuous "
   "mode.\n");
  poptPrintUsage(popt_context, stderr, 0);
  goto err_code;
 } else if (!continuous_mode) {
  num_cpus_to_pin = 1;
  cpus_to_pin[0] = cpus_online - 1;
 }

 max_msgs = fopen(MAX_MSGS, "r+");
 max_msgsize = fopen(MAX_MSGSIZE, "r+");
 if (!max_msgs)
  shutdown(2, "Failed to open msg_max", __LINE__);
 if (!max_msgsize)
  shutdown(2, "Failed to open msgsize_max", __LINE__);

 /* Load up the current system values for everything we can */
 getr(RLIMIT_MSGQUEUE, &saved_limits);
 cur_limits = saved_limits;
 saved_max_msgs = cur_max_msgs = get(max_msgs);
 saved_max_msgsize = cur_max_msgsize = get(max_msgsize);
 errno = 0;
 cur_nice = getpriority(PRIO_PROCESS, 0);
 if (errno)
  shutdown(2, "getpriority()", __LINE__);

 /* Tell the user our initial state */
 printf("\nInitial system state:\n");
 printf("\tUsing queue path:\t\t\t%s\n", queue_path);
 printf("\tRLIMIT_MSGQUEUE(soft):\t\t\t%ld\n",
  (long) saved_limits.rlim_cur);
 printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t%ld\n",
  (long) saved_limits.rlim_max);
 printf("\tMaximum Message Size:\t\t\t%d\n", saved_max_msgsize);
 printf("\tMaximum Queue Size:\t\t\t%d\n", saved_max_msgs);
 printf("\tNice value:\t\t\t\t%d\n", cur_nice);
 printf("\n");

 increase_limits();

 printf("Adjusted system state for testing:\n");
 if (cur_limits.rlim_cur == RLIM_INFINITY) {
  printf("\tRLIMIT_MSGQUEUE(soft):\t\t\t(unlimited)\n");
  printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t(unlimited)\n");
 } else {
  printf("\tRLIMIT_MSGQUEUE(soft):\t\t\t%ld\n",
         (long) cur_limits.rlim_cur);
  printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t%ld\n",
         (long) cur_limits.rlim_max);
 }
 printf("\tMaximum Message Size:\t\t\t%d\n", cur_max_msgsize);
 printf("\tMaximum Queue Size:\t\t\t%d\n", cur_max_msgs);
 printf("\tNice value:\t\t\t\t%d\n", cur_nice);
 printf("\tContinuous mode:\t\t\t(%s)\n", continuous_mode ?
        (continuous_mode_fake ? "fake mode" : "enabled") :
        "disabled");
 printf("\tCPUs to pin:\t\t\t\t%d", cpus_to_pin[0]);
 for (cpu = 1; cpu < num_cpus_to_pin; cpu++)
   printf(",%d", cpus_to_pin[cpu]);
 printf("\n");

 sa.sa_sigaction = sig_action_SIGUSR1;
 sigemptyset(&sa.sa_mask);
 sigaddset(&sa.sa_mask, SIGHUP);
 sigaddset(&sa.sa_mask, SIGINT);
 sigaddset(&sa.sa_mask, SIGQUIT);
 sigaddset(&sa.sa_mask, SIGTERM);
 sa.sa_flags = SA_SIGINFO;
 if (sigaction(SIGUSR1, &sa, NULL) == -1)
  shutdown(1, "sigaction(SIGUSR1)", __LINE__);
 sa.sa_sigaction = sig_action;
 if (sigaction(SIGHUP, &sa, NULL) == -1)
  shutdown(1, "sigaction(SIGHUP)", __LINE__);
 if (sigaction(SIGINT, &sa, NULL) == -1)
  shutdown(1, "sigaction(SIGINT)", __LINE__);
 if (sigaction(SIGQUIT, &sa, NULL) == -1)
  shutdown(1, "sigaction(SIGQUIT)", __LINE__);
 if (sigaction(SIGTERM, &sa, NULL) == -1)
  shutdown(1, "sigaction(SIGTERM)", __LINE__);

 if (!continuous_mode_fake) {
  attr.mq_flags = O_NONBLOCK;
  attr.mq_maxmsg = cur_max_msgs;
  attr.mq_msgsize = MSG_SIZE;
  open_queue(&attr);
 }
 for (i = 0; i < num_cpus_to_pin; i++) {
  pthread_attr_t thread_attr;
  void *thread_func;

  if (continuous_mode_fake)
   thread_func = &fake_cont_thread;
  else if (continuous_mode)
   thread_func = &cont_thread;
  else
   thread_func = &perf_test_thread;

  CPU_ZERO_S(cpu_set_size, cpu_set);
  CPU_SET_S(cpus_to_pin[i], cpu_set_size, cpu_set);
  pthread_attr_init(&thread_attr);
  pthread_attr_setaffinity_np(&thread_attr, cpu_set_size,
         cpu_set);
  if (pthread_create(&cpu_threads[i], &thread_attr, thread_func,
       NULL))
   shutdown(1, "pthread_create()", __LINE__);
  pthread_attr_destroy(&thread_attr);
 }

 if (!continuous_mode) {
  pthread_join(cpu_threads[0], &retval);
  shutdown((long)retval, "perf_test_thread()", __LINE__);
 } else {
  while (1)
   sleep(1);
 }
 shutdown(0, "", 0);

err_code:
 CPU_FREE(cpu_set);
 exit(1);

}