On Fri, Jun 4, 2010 at 1:26 PM, Jon Schewe <jpschewe@mtu.net> wrote:
On 6/4/10 9:33 AM, Andres Freund wrote: > On Friday 04 June 2010 16:25:30 Tom Lane wrote: > >> 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. >> > Jon: To verify you can enable it via the barrier=1 option during mounting.. > > >
First some details: Linux kernel 2.6.31 postgres version: 8.4.2
More test results: reiserfs: ~1 hour 50 minutes ext3 barrier=1: ~15 minutes ext4 nobarrier: ~15 minutes jfs: ~15 minutes
