improving concurrency/performance

Patrick H Radtke phr2101 at
Fri Nov 4 22:14:10 EST 2005

How bad is your performance with imapcopy?

I've never had 'fast' performance with IMAP.


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
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