From: Richard Huxton <dev@archonet.com>
To: Jason Lustig <lustig@brandeis.edu>
Cc: pgsql-performance@postgresql.org
Subject: Re: Autovacuum running out of memory
Date: Tue, 16 Oct 2007 15:01:10 +0100
Message-ID: <4714C426.3080207@archonet.com> (raw)
In-Reply-To: <57031F92-40D5-4832-8B76-FB73E510C735@brandeis.edu>
References: <374EB3D1-EE74-4B8C-9EEC-104ADD097568@brandeis.edu>
<4714A458.5060408@archonet.com>
<E8328FA1-800E-4684-93D2-A1002BB72396@brandeis.edu>
<4714AD30.6000103@archonet.com>
<57031F92-40D5-4832-8B76-FB73E510C735@brandeis.edu>
Jason Lustig wrote:
> I lowered the maintenance_work_mem to 50MB and am still getting the same
> errors:
>
> Oct 16 09:26:57 [16402]: [1-1] user=,db= ERROR: out of memory
> Oct 16 09:26:57 [16402]: [1-2] user=,db= DETAIL: Failed on request of
> size 52428798.
> Oct 16 09:27:57 [16421]: [1-1] user=,db= ERROR: out of memory
> Oct 16 09:27:57 [16421]: [1-2] user=,db= DETAIL: Failed on request of
> size 52428798.
> Oct 16 09:29:44 [16500]: [1-1] user=,db= ERROR: out of memory
> Oct 16 09:29:44 [16500]: [1-2] user=,db= DETAIL: Failed on request of
> size 52428798.
Hmm - it's now failing on a request of 50MB, which shows it is in fact
maintenance_work_mem that's the issue.
> Looking at my free memory (from TOP) I find
>
> Mem: 2062364k total, 1846696k used, 215668k free, 223324k buffers
> Swap: 2104496k total, 160k used, 2104336k free, 928216k cached
>
> So I don't think that I'm running out of memory total... it seems like
> it's continually trying to do it. Is there a reason why Postgres would
> be doing something without a username or database? Or is that just how
> autovacuum works?
I've not seen an error at startup before, but if it's not connected yet
then that would make sense.
I'm guessing this is a per-user limit that the postgres user is hitting.
If you "su" to user postgres and run "ulimit -a" that should show you if
you have any limits defined. See "man bash" for more details on ulimit.
--
Richard Huxton
Archonet Ltd
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To: pgsql-performance@postgresql.org
Cc: dev@archonet.com, lustig@brandeis.edu
Subject: Re: Autovacuum running out of memory
In-Reply-To: <4714C426.3080207@archonet.com>
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