improving concurrency/performance

[Tarjei Huse]

On Fri, 2005-11-04 at 22:14 -0500, Patrick H Radtke wrote:
> How bad is your performance with imapcopy?
> 
> I've never had 'fast' performance with IMAP.

Have you tried other tools like imapsync?

Also, maybe it's better to dun many copies of the tool at once instead
of just one process.

Tarjei
> -Patrick
> 
> 
> On Fri, 4 Nov 2005, John Madden wrote:
> 
> > I've had great experience with the performance of Cyrus thus far, but I'm testing
> > a migration at the moment (via imapcopy) and I'm having some pretty stinky
> > results.  There's no iowait (4 stripes on a 2Gbps SAN), no cpu usage, nothing
> > waiting on the network, and still I'm seeing terrible performance.  I assume this
> > points to something internal, such as concurrency on the db files.
> >
> > I've converted everything to skiplist already, I've tweaked reiserfs's mount
> > options, what little Berkeley still used appears to be ok (no waiting on locks and
> > such), so I'm at a loss.  Is there a general checklist of things to have a look
> > at?  Are their tools to look at the metrics of the skiplist db's (such as
> > Berkeley's db_stat)?  Am I doomed to suffer sub-par performance as long as IMAP
> > writes are happening?
> >
> > Migration's coming on the 24th.  I'm now officially sweating. :)
> >
> > Thanks,
> >  John
> >
> >
> >
> >
> > -- 
> > John Madden
> > UNIX Systems Engineer
> > Ivy Tech Community College of Indiana
> > jmadden at ivytech.edu
> >
> > ----
> > Cyrus Home Page: http://asg.web.cmu.edu/cyrus
> > Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu
> > List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
> >
> >
> ----
> Cyrus Home Page: http://asg.web.cmu.edu/cyrus
> Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu
> List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
-- 
Tarjei Huse <tarjei at nu.no>