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From: Josh Berkus <josh@agliodbs.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-performance@postgresql.org, Greg Smith <greg@2ndquadrant.com>
Subject: Re: Defaulting wal_sync_method to fdatasync on Linux for 9.1?
Date: Tue, 16 Nov 2010 17:17:42 -0800
Message-ID: <4CE32D36.5040902@agliodbs.com> (raw)
In-Reply-To: <9058.1289950294@sss.pgh.pa.us>
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	<201011010010.28724.andres@anarazel.de>
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	<AANLkTinEAmKDz7x356bgX=-6x7zpjK3bB0hYAmKvYHB9@mail.gmail.com>
	<4CE2EBF8.4040602@2ndquadrant.com>
	<4CE312D9.6030503@agliodbs.com>
	<9058.1289950294@sss.pgh.pa.us>


> Well, we're not going to increase the default to gigabytes, but we could
> very probably increase it by a factor of 10 or so without anyone
> squawking.  It's been awhile since I heard of anyone trying to run PG in
> 4MB shmmax.  How much would a change of that size help?

Last I checked, though, this comes out of the allocation available to
shared_buffers.  And there definitely are several OSes (several linuxes,
OSX) still limited to 32MB by default.

-- 
                                  -- Josh Berkus
                                     PostgreSQL Experts Inc.
                                     http://www.pgexperts.com



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