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From: Scott Marlowe <scott.marlowe@gmail.com>
To: Andrej Ricnik-Bay <andrej.groups@gmail.com>
Cc: Mark Wong <markwkm@gmail.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: file system and raid performance
Date: Thu, 7 Aug 2008 15:30:13 -0600
Message-ID: <dcc563d10808071430ja002d46x5459e535e97d5419@mail.gmail.com> (raw)
In-Reply-To: <b35603930808071359s6764d230u11fcaaec267ab289@mail.gmail.com>
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	<4898E80A.3020809@paradise.net.nz>
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	<70c01d1d0808071236u36fe5002w833582b036d952e8@mail.gmail.com>
	<b35603930808071359s6764d230u11fcaaec267ab289@mail.gmail.com>

On Thu, Aug 7, 2008 at 2:59 PM, Andrej Ricnik-Bay
<andrej.groups@gmail.com> wrote:
> To me it still boggles the mind that noatime should actually slow down
> activities on ANY file-system ... has someone got an explanation for
> that kind of behaviour?  As far as I'm concerned this means that even
> to any read I'll add the overhead of a write - most likely in a disk-location
> slightly off of the position that I read the data ... how would that speed
> the process up on average?

noatime turns off the atime write behaviour.  Or did you already know
that and I missed some weird post where noatime somehow managed to
slow down performance?



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