[Linux學習日誌] OS中的記憶體快取

posted in: Linux, Server | 2

最近在玩cloudatcost賣的便宜vps主機,發現明明我什麼程式都沒開,結果記憶體卻用到了73%,如下圖:

image

查了一下,發現下面這篇文章寫的蠻好的:

http://blogger.gtwang.org/2013/07/linux-cache-memory-linux.html

原來linux會把沒用到memory拿來當做memdisk來用阿……第一次知道有這種事。

另外發現自己不太懂buffer跟cache的差別,稍微查了一下:

http://stackoverflow.com/questions/6345020/linux-memory-buffer-vs-cache

簡單來說:

A buffer is something that has yet to be “written” to disk.

A cache is something that has been “read” from the disk and stored for later use.

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