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Re: long wait times in ProcessCatchupEvent()

From: bock(at)openit(dot)de (Julian v(dot) Bock)
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: long wait times in ProcessCatchupEvent()
Date: 2010-12-30 15:03:53
Message-ID: lp8vz7715y.fsf@warpcore.i.openit.de (view raw or flat)
Thread:
Lists: pgsql-performance
Hi

>>>>> "TL" == Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:

TL> bock(at)openit(dot)de (Julian v. Bock) writes:
>> I have the problem that on our servers it happens regularly under a
>> certain workload (several times per minute) that all backend
>> processes get a SIGUSR1 and spend several seconds in
>> ProcessCatchupEvent().

TL> This is fixed in 8.4 and up.
TL> http://archives.postgresql.org/pgsql-committers/2008-06/msg00227.php

Thanks for the quick reply.

TL> If you aren't willing to move off 8.3 you might be able to
TL> ameliorate the problem by reducing the volume of catalog changes,
TL> but that can be pretty hard if you're dependent on temp tables.

Upgrading to 8.4 or 9.0 is not possible at the moment but if it is only
catalog changes I can probably work around that.

Regards,
Julian v. Bock

-- 
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