为什么Directory.GetFiles（）在后续运行中运行得更快？ [英] Why does Directory.GetFiles() run faster on subsequent runs?

问题描述

我不太确定是什么原因造成的，因此，如果我找不到搜索所需的信息，请原谅我。例如：

假设我们有一个包含1,000,000个文件的文件夹。在其上运行Directory.GetFiles（）将花费几分钟。但是，立即重新运行仅需几秒钟。为什么会这样？对象是否被缓存在某个地方？我该如何使用原始时间运行它？尝试在完全不同的扇区中读取大量其他目录信息，以清除缓存。

I'm not really sure what causes this so please forgive me if I couldn't find the information I needed in a search. Here is an example:

Let's say that we have a folder with 1,000,000 files. Running Directory.GetFiles() on that will take a few minutes. However, running it again right after will take only a few seconds. Why does this happen? Are the objects being cached somewhere? How can I run it with the original time?

解决方案

Hard drives have internal caches that will help speed up subsequent reads. Try reading a bunch of other directory information in a completely different sector to clear the cache.

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