如果你有一臺記憶體很大的電腦，你是否會從禁用頁面檔案中得到好處，或者你應該保持足夠好的狀態？今天的超級使用者問答討論這個話題，以幫助滿足讀者的好奇心。

今天的問答環節是由SuperUser提供的，SuperUser是Stack Exchange的一個分支，是一個由社群驅動的問答網站分組。

照片由柯林·安德森（Flickr）提供。

問題

超級使用者閱讀器user1306322想知道如果一個人的計算機有大量RAM，禁用頁面檔案是否有好處：

Imagine that I have t*** of RAM, say 64 GB, for example. That is a lot, even for gaming computers. Now the default location of a page file in Windows is on the main operating system drive (be it HDD or SSD), which is faster in general but still not as fast as RAM.

Something tells me that disabling the page file on the hard-drive or creating a virtual RAM drive and letting the page file be there could make Windows move all its virtual memory to RAM and increase the system’s performance. But I am not very knowledgeable in that area, so that might not be true at all.

I tried both, but I could not ****yze the results to reach a definite conclusion with my knowledge level in memory-related matters. Would this work? If not, then why?

使用者1306322是否會從禁用頁面檔案中獲益？

答案

超級使用者貢獻者David Schwartz為我們提供了答案：

No matter how much RAM you have, you want the system to be able to use it efficiently. Not having a page file at all forces the operating system to use RAM inefficiently for two reas***:

• First, it cannot make pages discardable, even if they have not been accessed or modified in a very long time, which forces the disk cache to be **aller.
• Second, it has to reserve physical RAM to back allocati*** that are very unlikely to ever require it (for example, a private, modifiable file mapping), leading to a case where you can have plenty of free physical RAM and yet allocati*** are refused to avoid over-committing.

C***ider, for example, if a program makes a writable, private memory mapping of a 4 GB file. The operating system has to reserve 4 GB of RAM for this mapping because the program could conceivably modify every byte and there is no place but RAM to store it. So from the start, 4 GB of RAM is basically wasted (it can be used to cache clean disk pages, but that is about it).

You need to have a page file if you want to get the most out of your RAM, even if it is never used. It acts as an insurance policy that allows the operating system to actually use the RAM it has, rather than having to reserve it for possibilities that are extraordinarily unlikely.

The people who designed your operating system’s behavior are not fools. Having a page file gives the operating system more choices, and it will not make bad ones.

There is no point in trying to put a page file in RAM. And if you have lots of RAM, the page file is very unlikely to be used (it just needs to be there), so it does not particularly matter how fast the device it is on is.

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