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/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* Copyright 2010 Douglas Santos <douglas.santos@polymtl.ca>
* Copyright 2021 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* LTTng Userspace Tracer (UST) - benchmark tool
*/
#include <stdio.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <sched.h>
#include <time.h>
#include <urcu/compiler.h>
#ifdef TRACING
#define LTTNG_UST_TRACEPOINT_DEFINE
#include "ust_tests_benchmark.h"
#endif
#define printf_verbose(fmt, args...) \
do { \
if (verbose_mode) \
printf(fmt, ## args); \
} while (0)
static int verbose_mode;
struct thread_counter {
unsigned long long nr_loops;
};
static int nr_threads;
static unsigned long duration;
static volatile int test_go, test_stop;
static
void do_stuff(void)
{
int i;
#ifdef TRACING
int v = 50;
#endif
for (i = 0; i < 100; i++)
cmm_barrier();
#ifdef TRACING
lttng_ust_tracepoint(ust_tests_benchmark, tpbench, v);
#endif
}
static
void *function(void *arg __attribute__((unused)))
{
unsigned long long nr_loops = 0;
struct thread_counter *thread_counter = arg;
while (!test_go)
cmm_barrier();
for (;;) {
do_stuff();
nr_loops++;
if (test_stop)
break;
}
thread_counter->nr_loops = nr_loops;
return NULL;
}
static
void usage(char **argv) {
printf("Usage: %s nr_threads duration(s) <OPTIONS>\n", argv[0]);
printf("OPTIONS:\n");
printf(" [-v] (verbose output)\n");
printf("\n");
}
int main(int argc, char **argv)
{
unsigned long long total_loops = 0;
unsigned long i_thr;
void *retval;
int i;
if (argc < 3) {
usage(argv);
exit(1);
}
nr_threads = atoi(argv[1]);
duration = atol(argv[2]);
for (i = 3; i < argc; i++) {
if (argv[i][0] != '-')
continue;
switch (argv[i][1]) {
case 'v':
verbose_mode = 1;
break;
}
}
printf_verbose("using %d thread(s)\n", nr_threads);
printf_verbose("for a duration of %lds\n", duration);
pthread_t thread[nr_threads];
struct thread_counter thread_counter[nr_threads];
for (i = 0; i < nr_threads; i++) {
thread_counter[i].nr_loops = 0;
if (pthread_create(&thread[i], NULL, function, &thread_counter[i])) {
fprintf(stderr, "thread create %d failed\n", i);
exit(1);
}
}
test_go = 1;
for (i_thr = 0; i_thr < duration; i_thr++) {
sleep(1);
if (verbose_mode) {
fwrite(".", sizeof(char), 1, stdout);
fflush(stdout);
}
}
printf_verbose("\n");
test_stop = 1;
for (i = 0; i < nr_threads; i++) {
if (pthread_join(thread[i], &retval)) {
fprintf(stderr, "thread join %d failed\n", i);
exit(1);
}
total_loops += thread_counter[i].nr_loops;
}
printf("Number of loops: %llu\n", total_loops);
return 0;
}
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