mq_perf_tests.c

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/*
 * This application is Copyright 2012 Red Hat, Inc.
 *  Doug Ledford <[email protected]>
 *
 * 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 <mqueue.h>
#include <popt.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 min(a, b) ((a) < (b) ? (a) : (b))
#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;

    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__);
}

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%d\n", result.mq_maxmsg);
    printf("\t\tmq_msgsize:\t\t\t%d\n", result.mq_msgsize);
    printf("\t\tmq_curmsgs:\t\t\t%d\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, 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}
};

void *perf_test_thread(void *arg)
{
    char buff[MSG_SIZE];
    int prio_out, 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%d 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%d.%ds 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%d nsec/msg\n", nsec);
    printf("\t\tRecv msg:\t\t\t%d.%ds 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%d nsec/msg\n", nsec);


    for (cur_test = test2; cur_test->desc != NULL; cur_test++) {
        printf(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%d.%ds 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%d nsec/msg\n", nsec);
        printf("\t\tRecv msg:\t\t\t%d.%ds 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%d 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;
    struct sigaction sa;
    poptContext popt_context;
    char rc;
    void *retval;

    main_thread = pthread_self();
    num_cpus_to_pin = 0;

    if (sysconf(_SC_NPROCESSORS_ONLN) == -1) {
        perror("sysconf(_SC_NPROCESSORS_ONLN)");
        exit(1);
    }
    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");
                    exit(1);
                } 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()");
                    exit(1);
                }
                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);
        exit(1);
    } else if (!continuous_mode) {
        num_cpus_to_pin = 1;
        cpus_to_pin[0] = cpus_online - 1;
    }

    if (getuid() != 0) {
        fprintf(stderr, "Not running as root, but almost all tests "
            "require root in order to modify\nsystem settings.  "
            "Exiting.\n");
        exit(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%d\n", saved_limits.rlim_cur);
    printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t%d\n", 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%d\n",
               cur_limits.rlim_cur);
        printf("\tRLIMIT_MSGQUEUE(hard):\t\t\t%d\n",
               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);
}