计算程序运行时间的代码

原创已于 2025-02-07 08:21:40 修改 · 181 阅读

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于 2025-02-05 22:55:54 首次发布

 

#include <stdlib.h>

#include <stdio.h>


#include <sys/time.h>



#define GET_TIME_INIT(num) struct timeval _timers[num]



#define GET_TIME_VAL(num) gettimeofday(&_timers[num], NULL)



#define TIME_VAL_TO_MS(num) (((double)_timers[num].tv_sec*1000.0) + ((double)_timers[num].tv_usec/1000.0))



int main() { 

	GET_TIME_INIT(3);
sleep(1);

 

				GET_TIME_VAL(0);

 					sleep(1);

				GET_TIME_VAL(1);

 sleep(2);

				GET_TIME_VAL(2);




				printf("1:0 ms =  %f \n" , TIME_VAL_TO_MS(1) - TIME_VAL_TO_MS(0) );  		
			printf("2:1 ms =  %f \n" , TIME_VAL_TO_MS(2) - TIME_VAL_TO_MS(1) );  		



			}

先上代码，后面再分析。、

#include <windows.h>

#define GET_TIME_INIT(num) LARGE_INTEGER _timers[num]; LARGE_INTEGER _freq; QueryPerformanceFrequency(&_freq)

#define GET_TIME_VAL(num) QueryPerformanceCounter(&_timers[num])

#define TIME_VAL_TO_MS(num) ((double)_timers[num].QuadPart*1000.0/_freq.QuadPart)