Re: How filesystems matter with PostgreSQL

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Andres Freund <andres(at)anarazel(dot)de>
Cc: pgsql-performance(at)postgresql(dot)org, Jon Schewe <jpschewe(at)mtu(dot)net>
Subject: Re: How filesystems matter with PostgreSQL
Date: 2010-06-04 14:25:30
Message-ID: 2503.1275661530@sss.pgh.pa.us
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Andres Freund <andres(at)anarazel(dot)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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