IBM Edward G. Bradford LINUX&WINDOWS;精确计时比较, windows 精度稍差，效率稍低，不过两者都可以接受。
运行时：Linux 和 Windows 2000上的高性能编程技术用 QueryPerformanceCounter() 计算秒
LARGE_INTEGER tim, freq; double seconds;
QueryPerformanceCounter(&tim;); QeryPerformanceFrequency(&freq;); seconds = (double)tim / (double) freq;
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运行时：Linux 和 Windows 2000上的高性能编程技术
用 QueryPerformanceCounter() 计算秒
LARGE_INTEGER tim, freq;
double seconds;
QueryPerformanceCounter(&tim;);
QeryPerformanceFrequency(&freq;);
seconds = (double)tim / (double) freq;