Webmaster Extraordinaire wrote:
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 <torl...@xenia.sote.hu> wrote:
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.
Hi, let me summarize the suggestions I got, and my experience with them:
1. disable Horde Alarms: it didn't help me
2. disable/limit mailbox sorting on anything other than arrival time:
also didn't help me
3. disable preview: since I disabled it, I don't have the slowdowns, so
I believe this is the problem. I can confirm what Erik says, I had the
preview enabled before (with Horde/Imp 3.1.5/4.1.5) and never had a
problem like this. So indeed something must have been changed in the
preview code that eats system resources. I'll wait a few days, just to
make sure I won't experience any slowdowns, and I'll report this as a bug.
Yours: Laszlo
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