/*
* 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 <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__);
}
/**
* 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%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}
};
/**
* 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, 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);
}
