计算程序运行时间

计算程序运行时间


方法一：

int64 now,then;
double elapsed_seconds, tickspersecond=cvGetTickFrequency() * 1.0e6; 


while(1) { 
then = cvGetTickCount(); 
doSomeStuff(); 
now = cvGetTickCount(); 
elapsed_seconds = (double)(now - then) / tickspersecond;
cout<<"运行时间为："<<elapsed_seconds<<"秒"<<endl; 
}

方法二：

double time0 = static_cast<double>(getTickCount());


doSomeStuff();


time0 = ((double)getTickCount() - time0)/getTickFrequency();


cout<<"运行时间为："<<time0<<"秒"<<endl;