Patrick H Radtke
phr2101 at columbia.edu
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. :)
> 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
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