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From: Evgeniy Shishkin <itparanoia@gmail.com>
To: AJ Weber <aweber@comcast.net>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: autovacuum fringe case?
Date: Wed, 23 Jan 2013 23:03:25 +0400
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On 23.01.2013, at 20:53, AJ Weber <aweber@comcast.net> wrote:

> I have a server that is IO-bound right now (it's 4 cores, and top indicates the use rarely hits 25%, but the Wait spikes above 25-40% regularly).  The server is running postgresql 9.0 and tomcat 6.  As I have mentioned in a previous thread, I can't alter the hardware to add disks unfortunately, so I'm going to try and move postgresql off this application server to its own host, but this is a production environment, so in the meantime...
> 
> Is it possible that some spikes in IO could be attributable to the autovacuum process?  Is there a way to check this theory?
> 

Try iotop

> Would it be advisable (or even permissible to try/test) to disable autovacuum, and schedule a manual vacuumdb in the middle of the night, when this server is mostly-idle?
> 
> Thanks for any tips.  I'm in a bit of a jam with my limited hardware.
> 
> -AJ
> 
> 
> 
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