算法程序中精确统计运行时间的方法（C/C++）

关键函数

　　在Windows.h中

　　QueryPerformanceFrequency，QueryPerformanceCounter

示例

 1 LARGE_INTEGER litmp;
 2 double frequency,runTime,minus;//CPU时钟频率，运行时间，运行周期数之差
 3 LONGLONG timeStart,timeEnd;//排序前周期数，排序执行后周期数
 4 QueryPerformanceFrequency(&litmp);
 5 frequency=(double) litmp.QuadPart;
 6 QueryPerformanceCounter(&litmp);
 7 timeStart=litmp.QuadPart;
 8 
 9 //要统计时间的核心代码
10 
11 QueryPerformanceCounter(&litmp);
12 timeEnd=litmp.QuadPart;
13 minus=(double)(timeEnd-timeStart);
14 runTime=minus/frequency;

posted on 2011-10-26 16:07 Auguster 阅读(1184) 评论(0) 收藏举报