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