Message-ID: <486114BF.7040901@lelarge.info>
Date: Tue, 24 Jun 2008 17:37:35 +0200
From: Guillaume Lelarge <guillaume@lelarge.info>
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To: Tom Lane <tgl@sss.pgh.pa.us>
CC: Marc Cousin <mcousin@sigma.fr>, pgsql-admin@postgresql.org
Subject: Re: plpgsql function seems to be leaking memory
References: <200806241056.29589.mcousin@sigma.fr>
	<16759.1214319370@sss.pgh.pa.us>
In-Reply-To: <16759.1214319370@sss.pgh.pa.us>
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Tom Lane a écrit :
> Marc Cousin <mcousin@sigma.fr> writes:
>> I'm having a problem with plpgsql functions leaking memory.
> 
> Your example shows absolutely no memory leak here, in either 8.3.3
> or CVS HEAD.
> 
>> I see the postgresql process growing from 8MB to about 400 MB during this 
>> run...
> 
> What do you have shared_buffers set to?  I think you might be getting
> fooled by top's treatment of shared memory (ie, it starts to count
> shared pages after the process touches them for the first time).
> 

That's what I thought at first when I saw Marc's email. I tried his 
example many times, with different values for shared_buffers. RSS column 
climbs until it reaches more or less the shared_buffers configuration. 
But, if I launch another psql, this process will have a much lower value 
on the RSS column. Shouldn't it get the RSS at the same value, even when 
the process starts ?

I'm a bit puzzled by this column, anyone has a URL where I can find more 
info?

Regards.


-- 
Guillaume.
  http://www.postgresqlfr.org
  http://dalibo.com