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LINUX-L  2007

LINUX-L 2007

Subject:

Re: My server uses swap :(

From:

Daniel Franke <[log in to unmask]>

Reply-To:

Platform Independent Linux List! <[log in to unmask]>

Date:

Sat, 10 Mar 2007 20:56:02 -0500

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text/plain (38 lines)

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On Sun, Mar 11, 2007 at 12:39:41AM +0200, Arthur Sherman wrote:
> I've 3GB RAM on my (hosting) server.
> When I last checked with 'free', I realised that it had some KB of swap
> used, while having >2GB of RAM unused:
>
> --
> [root@ns1 mail]# free
> total used free shared buffers cached
> Mem: 3115152 969056 2146096 0 163456 303584
> -/+ buffers/cache: 502016 2613136
> Swap: 1052152 8 1052144
> --
>
> I assume that there has been a peak in usage.
> How do I check what app/site sucked the RAM?

That's completely normal. The kernel will always try to use as much memory
as it can spare for I/O buffering. If buffer memory gets heavily fragmented,
it'll use a bit of swap space while it defragments. The performance impact
is negligible and it'll happen no matter how much RAM you have. After the
memory frees up, the swap space will remain in use because fetching from
swap is done lazily (i.e. on-demand).

- --
 Daniel Franke [log in to unmask] http://www.dfranke.us
 |----| =|\ \\\\
 || * | -|-\--------- Man is free at the instant he wants to be.
 -----| =| \ /// --Voltaire
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