From: | Dan Harris <fbsd(at)drivefaster(dot)net> |
---|---|
To: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Background vacuum |
Date: | 2007-05-10 05:05:21 |
Message-ID: | 4642A811.9010703@drivefaster.net |
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Thread: | |
Lists: | pgsql-performance |
Daniel Haensse wrote:
> Dear list,
>
> I'm running postgres on a tomcat server. The vacuum is run every hour
> (cronjob) which leads to a performance drop of the tomcat applications.
> I played around with renice command and I think it is possible to reduce
> this effect which a renice. The problem is how can I figure out the PID
> of the postmaster performing the vacuum(automated)? Has anybody a nice
> solution to change process priority? A shell script, maybe even for java?
>
While this may technically work, I think it lacks a key point. 'nice' ( at
least the versions I'm familiar with ) do not adjust I/O priority. VACUUM is
bogging things down because of the extra strain on I/O. CPU usage shouldn't
really be much of a factor.
Instead, I would recommend looking at vacuum_cost_delay and the related settings
to make vacuum lower priority than the queries you care about. This should be a
cleaner solution for you.
-Dan
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