[imp] Slow mailbox list from time to time

[Webmaster Extraordinaire]

I think we have the same problem up to and including the top results.  Ours is caused by enabling message preview.  We discovered the problem after I went through message by message in a mailbox, found a 2 MB message (it was an error log), removed it and the mailbox opened significantly faster.

When we switch versions back to 3.1.1 the mailbox loads quickly and with no problems.  So something changed somewhere on the way with message preview.

Erik

--- On Thu, 6/4/09, Tornoci Laszlo <torlasz at xenia.sote.hu> wrote:

> From: Tornoci Laszlo <torlasz at xenia.sote.hu>
> Subject: [imp] Slow mailbox list from time to time
> To: imp at lists.horde.org
> Date: Thursday, June 4, 2009, 12:26 AM
> Hi,
> 
> I have a Horde/IMP system that behaves strangely since I
> upgraded from 3.1.5/4.1.5 to 3.3.4/4.3.4. I have about 400
> users with 50-70 concurrent sessions usually. The IMAP
> mailstore (Cyrus) and the MTA are on separate boxes. The
> system is dual Xeon (quad core) 2GHz, 2GB RAM.
> 
> We had excellent response times before the upgrade. The
> problem is, we still have excellent response times
> (practically instantaneous mailbox lists with > 3000
> mails in one folder) most of the time, BUT sometimes for
> long periods of time, I get miserable response times (30-80
> sec waiting) for the same large mailbox to be listed. "top"
> show the http process to shoot up to 100% cpu while waiting,
> but nothing else remarkable. Restarting http or mysqld
> doesn't help. Logging in is not slow. The larger a mailbox,
> the worse the problem is.
> After some time, response times get back to normal.
> 
> It's not the IMAP box. Using IMAP clients, direct access to
> the IMAP box shows absolutely no difference.
> 
> Access is always fine if I use the "dynamic" mode. This
> problem appears only if using the "traditional" mode.
> 
> Can't see any unusual network or process activity. There is
> no obvious correlation with the number of concurrent users
> either.
> 
> Any ideas, anyone?
> 
> 
>            
>         Yours: Laszlo
>            
>         
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