From: Tom Lane <tgl@sss.pgh.pa.us>
To: Pierre C <lists@peufeu.com>
Cc: Greg Smith <greg@2ndquadrant.com>
Cc: Dave Crooke <dcrooke@gmail.com>
Cc: Paul McGarry <paul@paulmcgarry.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: shared_buffers advice
Date: Tue, 16 Mar 2010 10:30:32 -0400
Message-ID: <8285.1268749832@sss.pgh.pa.us> (raw)
In-Reply-To: <op.u9nrbeeteorkce@localhost>
References: <a056b1d41003101728h2bfe964cg43bf5ef1aabae14d@mail.gmail.com>
<ca24673e1003152217q117b0fd3q7d2d75ff20185c8b@mail.gmail.com>
<4B9F3302.4020900@2ndquadrant.com>
<op.u9nrbeeteorkce@localhost>
"Pierre C" <lists@peufeu.com> writes:
> Does PG issue checkpoint writes in "sorted" order ?
No. IIRC, a patch for that was submitted, and rejected because no
significant performance improvement could be demonstrated. We don't
have enough information about the actual on-disk layout to be very
intelligent about this, so it's better to just issue the writes and
let the OS sort them.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, lists@peufeu.com, greg@2ndquadrant.com, dcrooke@gmail.com, paul@paulmcgarry.com
Subject: Re: shared_buffers advice
In-Reply-To: <8285.1268749832@sss.pgh.pa.us>
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