On Mon, 2003-03-10 at 11:03, Juri Haberland wrote:
> > I have been experimenting with a few things, and have noticed that imapd
> > is almost unbearably slow when moving (actually, COPY 'ing) messages to
> > a Maildir that is 'large'. By 'large' I qualify that to mean roughly
> > 9000 messages. I am running under Linux 2.4.20, and use the ext3
> > filesystem, although I've run my experiments on both the IBM jfs and the
> > ext3 filesystems. The filesystem is not the issue here, however.
>
> Ext3 as a filesystem is most certainly an issue if it comes to many
> entries in one directory. Here a quote of a recent message by Andreas
> Dilger, one of the ext3 developers on the ext3 mailing list:
>
> > Yes, you will see this as a significant increase in system time for
> > directory access. The stock ext2/3 directory code doesn't work so well
> > past about 5000 entries in a single directory (it survives up to about
> > 10000 entries, but basically dies after that.
>
> I don't know about JFS, but I use XFS and it works quite nice.
Before switching to Courier, I did a bit of benchmarking of mbox vs
maildir, and ext3 vs reiserfs. The results are here:
http://www.decisionsoft.com/pdw/mailbench.html
I didn't test up to the sizes being discussed here, though.
Paul
--
Paul Warren, Client Services DecisionSoft Limited
+44-1865-203192 http://www.decisionsoft.com
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