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Large pgstat.stat file causes I/O storm

From: Cristian Gafton <gafton(at)rpath(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Large pgstat.stat file causes I/O storm
Date: 2008-01-29 16:39:02
Message-ID: Pine.LNX.4.64.0801291129340.19796@alienpad.rpath.com (view raw or flat)
Thread:
Lists: pgsql-hackers
Hello all,

I have a ~150GB sized server, containing two databases that are active in 
mostly read mode. I have noticed lately that the global/pgstat.stat file 
is somewhere around 1MB freshly after a restart, but at some point it 
baloons to 74MB in size for no apparent reason, after a few hours of 
uptime. Needless to say, having the stats collector dump 74MB of stuff on 
disk on its every loop takes a big bite of the I/O capabilities of this 
box.

Looking at all the othe replicas I have of this database (but which are 
under a more lightweight read load), the pgstat.stat file again is rather 
small in size. Am I right to assume that a 74MB pgstat.stat file is not 
normal - and what might have caused it?

Thanks,

Cristian
-- 
Cristian Gafton
rPath, Inc.


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Next:From: Cristian GaftonDate: 2008-01-29 16:43:46
Subject: Re: Large pgstat.stat file causes I/O storm
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Subject: Re: autonomous transactions

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