From: Jim C. Nasby <jnasby@pervasive.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Zoltan Boszormenyi <zboszor@dunaweb.hu>
Cc: pgsql-hackers@postgresql.org
Subject: Re: [PERFORM] psql -A (unaligned format) eats too much memory
Date: Mon, 5 Jun 2006 10:53:49 -0500
Message-ID: <20060605155349.GU53487@pervasive.com> (raw)
In-Reply-To: <20512.1149521250@sss.pgh.pa.us>
References: <44835834.2020309@dunaweb.hu>
<44835F86.5040008@dunaweb.hu>
<20060605152258.GT53487@pervasive.com>
<20512.1149521250@sss.pgh.pa.us>
On Mon, Jun 05, 2006 at 11:27:30AM -0400, Tom Lane wrote:
> "Jim C. Nasby" <jnasby@pervasive.com> writes:
> > I've been able to verify this on 8.1.4; psql -A -t -c 'SELECT * FROM
> > largetable' > /dev/null results in psql consuming vast quantities of
> > memory. Why is this?
>
> Is it different without the -A?
Nope.
> I'm reading this as just another uninformed complaint about libpq's
> habit of buffering the whole query result. It's possible that there's
> a memory leak in the -A path specifically, but nothing said so far
> provided any evidence for that.
Certainly seems like it. It seems like it would be good to allow for
libpq not to buffer, since there's cases where it's not needed...
--
Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: jnasby@pervasive.com, tgl@sss.pgh.pa.us, zboszor@dunaweb.hu, pgsql-hackers@postgresql.org
Subject: Re: [PERFORM] psql -A (unaligned format) eats too much memory
In-Reply-To: <20060605155349.GU53487@pervasive.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox