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Re: heavy swapping, not sure why

From: Florian Weimer <fweimer(at)bfk(dot)de>
To: Scott Marlowe <scott(dot)marlowe(at)gmail(dot)com>
Cc: Alan Hodgson <ahodgson(at)simkin(dot)ca>, pgsql-general(at)postgresql(dot)org
Subject: Re: heavy swapping, not sure why
Date: 2011-08-30 06:54:40
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Lists: pgsql-general
* Scott Marlowe:

> On a machine with lots of memory, I've run into pathological behaviour
> with both the RHEL 5 and Ubuntu 10.04 kernels where the kswapd starts
> eating up CPU and swap io like mad, while doing essentially nothing.
> Setting swappiness to 0 delayed this behaviour but did not stop it.
> Given that I'm on a machine with 128G ram, I just put "/sbin/swapoff
> -a" in /etc/rc.local and viola, problem solved.

Was this NUMA machine?  Some older kernels can only migrate pages
between nodes through swap.

Florian Weimer                <fweimer(at)bfk(dot)de>
BFK edv-consulting GmbH
Kriegsstra├če 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99

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