86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
|
#include <sys/time.h>
|
||
|
|
#include <time.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <signal.h>
|
||
|
|
|
||
|
|
#define TIME_CYCLE_SEC 10
|
||
|
|
|
||
|
|
typedef unsigned long long ull;
|
||
|
|
|
||
|
|
static ull max_wait_time = 0;
|
||
|
|
|
||
|
|
void termination_handler (int signum) {
|
||
|
|
if(signum == SIGINT) {
|
||
|
|
printf("----------------------------\n");
|
||
|
|
printf("Тест окончен!\n");
|
||
|
|
printf ("Максимальная задержка за всё время = %llu микросекунд\n", max_wait_time);
|
||
|
|
exit(0);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
int max_wait_test() {
|
||
|
|
|
||
|
|
signal(SIGINT, termination_handler);
|
||
|
|
|
||
|
|
struct timezone tz;
|
||
|
|
tz.tz_minuteswest = 0;
|
||
|
|
tz.tz_dsttime = 0;
|
||
|
|
|
||
|
|
struct timeval tv;
|
||
|
|
|
||
|
|
gettimeofday(&tv, &tz);
|
||
|
|
ull last_time = ((ull)tv.tv_sec) * 1000000 + (ull)tv.tv_usec;
|
||
|
|
ull start_tv_sec = (ull)tv.tv_sec;
|
||
|
|
ull last_tv_sec = start_tv_sec;
|
||
|
|
ull average_wait_time = 0;
|
||
|
|
|
||
|
|
while( 1 == 1 ) {
|
||
|
|
|
||
|
|
gettimeofday(&tv, &tz);
|
||
|
|
|
||
|
|
ull mcs = ((ull)tv.tv_sec) * 1000000 + (ull)tv.tv_usec;
|
||
|
|
|
||
|
|
ull delta_time = mcs - last_time;
|
||
|
|
|
||
|
|
if(delta_time > max_wait_time)
|
||
|
|
max_wait_time = delta_time;
|
||
|
|
|
||
|
|
if(delta_time > average_wait_time)
|
||
|
|
average_wait_time = delta_time;
|
||
|
|
|
||
|
|
|
||
|
|
// noop на несколько наносекунд
|
||
|
|
struct timespec wait_ts;
|
||
|
|
wait_ts.tv_sec = 0;
|
||
|
|
wait_ts.tv_nsec = 10;
|
||
|
|
nanosleep(&wait_ts,NULL);
|
||
|
|
|
||
|
|
// Выводим каждые TIME_CYCLE_SEC секунд среднюю задержку за эти TIME_CYCLE_SEC секунд
|
||
|
|
if(last_tv_sec + TIME_CYCLE_SEC <= tv.tv_sec) {
|
||
|
|
printf("----------------------------\n");
|
||
|
|
printf("Время выполнения = %llu секунд\n", last_tv_sec - start_tv_sec);
|
||
|
|
printf("Максимальная задержка за %d секунд = %llu микросекунд\n", TIME_CYCLE_SEC, average_wait_time);
|
||
|
|
printf ("Максимальная задержка за всё время = %llu микросекунд\n", max_wait_time);
|
||
|
|
fflush(stdout);
|
||
|
|
gettimeofday(&tv, &tz);
|
||
|
|
last_tv_sec = tv.tv_sec;
|
||
|
|
mcs = ((ull)tv.tv_sec) * 1000000 + (ull)tv.tv_usec;
|
||
|
|
average_wait_time = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
// сохраняем последнюю отметку времени
|
||
|
|
last_time = mcs;
|
||
|
|
}
|
||
|
|
|
||
|
|
return EXIT_SUCCESS;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char * argv[]) {
|
||
|
|
|
||
|
|
max_wait_test();
|
||
|
|
|
||
|
|
return EXIT_SUCCESS;
|
||
|
|
}
|
||
|
|
|