Linux：为进程禁用文件缓存？ [英] Linux : Disabling File cache for a process?

问题描述

有没有一种方法来禁用特定进程的文件缓存？

我有两个进程运行A和B.

我希望由A打开的文件保留在缓存中。

和
我不想为B启用文件缓存，所以它不会替换内存中进程缓存的文件。

有没有办法为特定的进程禁用文件缓存？

没有我知道的...唯一的选择是全局/设备特定的：

• 使用-sync选项和mount


• 使用 drop_caches

另外一点：$ b​​
$ b即使你可以做你所要求的，也不能保证任何其他进程C，D，E等）以内存中的进程A缓存的文件的方式取代...

UPDATE - after来自OP ragarding performance的评论：

Linux提供了一个叫做内存映射文件的东西（基本上这是一种访问文件的内容在内存中...操作系统分配地址空间的文件（取决于给定的参数）的一部分，并将文件的内容加载到地址空间（再次：确切的行为取决于给定的参数）。

你可以在过程A中实现你想要的功能...

结帐 mmap API调用以获取详细信息。

Is there a way to disable file cache for a particular process ?

I have two process running A and B.

I want file opened by A to remain in cache.

and I don't want to enable file cache for B so It doesn't replace the file cached by process in the memory.

Is there a way to disable file cache for a particular process?

解决方案

None that I know of... the only option are global/device-specific:

• using -sync option with mount
• using drop_caches

Another point:

Even IF you could do what you ask for there is no guarantee that any other processes (C, D, E etc.) behaves in a way that "the file cached by process A in the memory" gets replaced...

UPDATE - after comments from OP ragarding performance:

Linux offers (as most modern OS) something called "memory-mapped file" - basically this is a way to access the file's contents in-memory... the OS assigns the file (depending on the given params) part of the address space and loads the content of the file into that address space (again: exact behaviour depends on the given params).

You would do this in Process A to achieve what you want...

Checkout the mmap API calls for details.

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