Timer resolution in windows XP

最新推荐文章于 2023-05-17 10:56:54 发布

pkrobbie

最新推荐文章于 2023-05-17 10:56:54 发布

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本文链接：https://blog.youkuaiyun.com/pkrobbie/article/details/1486310

本文探讨了Windows操作系统中不同计时器的分辨率及应用。指出GetTickCount()已过时，建议使用GetSystemTimeAdjustment()获取更高精度。对于需要极高精度的应用场景，推荐使用QueryPerformanceFrequency和QueryPerformanceCounter，其精度可达纳秒级。

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Many articles said that the resolution of GetTickCount() is 55ms. It is obsolete for windows XP. We should use GetSystemTimeAdjustment() to retrieve the resolution. For Windows XP on a P4 computer, it is 15.6250 ms.

For high-resolution timer, we could use QueryPerformanceFrequency and QueryPerformanceCounter. The sample code is similar to the following:

LARGE_INTEGER Frequency;
QueryPerformanceFrequency(&Frequency);

LARGE_INTEGER beginPerformanceCount, endPerformanceCount;   // counter value

QueryPerformanceCounter(&beginPerformanceCount);

// Do something

QueryPerformanceCounter(&endPerformanceCount);

double valinSec = (double)(endPerformanceCount.QuadPart -  beginPerformanceCount.QuadPart)  /  (double)Frequency.QuadPart;

Its solution could be less than 1 nanosecond.