Re: memory leak regression 9.1 versus 8.1

From: Joe Conway <mail(at)joeconway(dot)com>
To: "Hackers (PostgreSQL)" <pgsql-hackers(at)postgresql(dot)org>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: Re: memory leak regression 9.1 versus 8.1
Date: 2012-05-10 00:06:30
Message-ID: 4FAB0686.2040908@joeconway.com
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On 05/09/2012 03:36 PM, Joe Conway wrote:
> Good call -- of course that just means my contrived example fails to
> duplicate the real issue :-(
> In the real example, even with work_mem = 1 MB I see the same behavior
> on 9.1.

OK, new script. This more faithfully represents the real life scenario,
and reproduces the issue on HEAD with out-of-the-box config settings,
versus 8.1 which completes the query having never exceeded a very modest
memory usage:

---------------
On pg 8.1 with out of the box config:
VIRT RES SHR
199m 11m 3032
---------------
On pg head with out of the box config:
VIRT RES SHR
1671m 1.5g 16m
---------------

I have not tried your ulimit suggestion yet but will do that next.

Joe

--
Joe Conway
credativ LLC: http://www.credativ.us
Linux, PostgreSQL, and general Open Source
Training, Service, Consulting, & 24x7 Support

Attachment Content-Type Size
9.1-memory-leak-regression.sql text/x-sql 1.4 KB

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