From: Andres Freund <andres@anarazel.de>
To: pgsql-performance@postgresql.org
Subject: Re: How filesystems matter with PostgreSQL
Date: Fri, 4 Jun 2010 15:04:02 +0200
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Cc: Jon Schewe <jpschewe@mtu.net>
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On Friday 04 June 2010 14:17:35 Jon Schewe wrote:
> Some interesting data about different filesystems I tried with
> PostgreSQL and how it came out.
> 
> I have an application that is backed in postgres using Java JDBC to
> access it. The tests were all done on an opensuse 11.2 64-bit machine,
> on the same hard drive (just ran mkfs between each test) on the same
> input with the same code base. All filesystems were created with the
> default options.
> 
> XFS (logbufs=8): ~4 hours to finish
> ext4: ~1 hour 50 minutes to finish
> ext3: 15 minutes to finish
> ext3 on LVM: 15 minutes to finish
My guess is that some of the difference comes from barrier differences. ext4 
uses barriers by default, ext3 does not.

Andres