From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: pgsql-performance@postgresql.org, Jon Schewe <jpschewe@mtu.net>
Subject: Re: How filesystems matter with PostgreSQL
Date: Fri, 04 Jun 2010 10:25:30 -0400
Message-ID: <2503.1275661530@sss.pgh.pa.us> (raw)
In-Reply-To: <201006041504.03218.andres@anarazel.de>
References: <4C08EEDF.7090403@mtu.net>
<201006041504.03218.andres@anarazel.de>
Andres Freund <andres@anarazel.de> writes:
> On Friday 04 June 2010 14:17:35 Jon Schewe wrote:
>> 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.
Or, to put it more clearly: the reason ext3 is fast is that it's unsafe.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, andres@anarazel.de, jpschewe@mtu.net
Subject: Re: How filesystems matter with PostgreSQL
In-Reply-To: <2503.1275661530@sss.pgh.pa.us>
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