Linux中的缓冲存储器和缓存存储器有什么区别? [英] What is the difference between buffer and cache memory in Linux?

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问题描述

对我来说,尚不清楚两个Linux内存概念:缓冲区缓存有什么区别。我已经阅读了这篇文章,在我看来,它们之间的区别是到期时间策略:

To me it's not clear what's the difference between the two Linux memory concepts : buffer and cache. I've read through this post and it seems to me that the difference between them is the expiration policy:


  1. 缓冲区的策略为先进先出

  2. 缓存的策略为最近最少使用。

我正确吗?

特别是,我正在查看以下两个命令:免费 vmstat

In particular, I'm looking at the two commands: free and vmstat

james@utopia:~$ vmstat -S M
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
5  0      0    173     67    912    0    0    19    59   75 1087 24  4 71  1
james@utopia:~$ free -m
             total       used       free     shared    buffers     cached
Mem:          2007       1834        172          0         67        914
-/+ buffers/cache:        853       1153
Swap:         2859          0       2859


推荐答案

缓冲区代表RAM的多少部分专用于缓存磁盘块。

"Buffers" represent how much portion of RAM is dedicated to cache disk blocks. "Cached" is similar like "Buffers", only this time it caches pages from file reading.

quote from:

quote from:

  • https://web.archive.org/web/20110207101856/http://www.linuxforums.org/articles/using-top-more-efficiently_89.html

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