OT: cached memory

Mike Hoskins michoski at cisco.com
Wed Jun 13 18:00:44 UTC 2012

this is a common source of confusion and more of a linuxism...it will fill
all available memory with cache, and reclaim as needed.  you can adjust it
somewhat with various sysctls.


-----Original Message-----
From: Dan Letkeman <danletkeman at gmail.com>
Date: Wednesday, June 13, 2012 10:50 AM
To: bind-users <bind-users at lists.isc.org>
Subject: OT: cached memory

>Just wondering if anyone has a real world example of how much cached
>memory a server really needs?
>If I run the command "free -m" it shows that it is using all of the
>memory on the server and most of it is cached.  I understand the
>concept and the reasoning, but what I would like to know is how much
>is a reasonable amount to have?  I am assuming that if I gave this
>server 10 times the amount it would eventually cache that as well.
>                  total       used       free     shared    buffers
>Mem:          3017       2961         56          0        158       2434
>-/+ buffers/cache:        368       2649
>Swap:         5023          0       5023
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