[Tickets #5634] Performance problems after upgrade to 4.1.4

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Ticket URL: http://bugs.horde.org/ticket/?id=5634
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 Ticket             | 5634
 Created By         | robin.west at dal.ca
 Summary            | Performance problems after upgrade to 4.1.4
 Queue              | IMP
 Version            | 4.1.4
 Type               | Bug
 State              | Unconfirmed
 Priority           | 3. High
 Owners             | 
+New Attachment     | old_webmail.log
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robin.west at dal.ca (2007-08-15 11:01) wrote:

After upgrading our Webmail installation this morning, we experienced
severe performance problems on our IMAP server. Backing out the upgrade
resolved the issue and subsequent tests confirmed that the new Webmail is
the source of the load, although we're not sure what it is doing. I'm
hoping you can give us some input or suggestions as to where to look to
resolve the problem. 

Our IMAP server is Cyrus IMAP4 2.1.11 running on Red Hat AS3. Normally it
handles around 2000 concurrent sessions and the load average is between 7
and 20. After the upgrade, concurrent sessions were as normal but the load
went up to over 700. 

We are running the following on six application servers (all Red Hat AS3,
PHP 4.3.2):
Horde 3.1.4 (upgraded from 3.0.4)
IMP 4.1.4 (upgraded from 4.0.3)
Ingo 1.1.3 (upgraded from 1.0.1)
Turba 2.1.4 (upgraded from 2.0.2)
Backend db is Postgres 7.3.19-RH and we also use LDAP as an address book
source.

I am attaching two trace files our sysadmins took from our IMAP server,
showing the IMAP commands generated by the same sequence of actions in both
the old installation and the new one. It's not very readable so I don't
know if it's much help. 

We've also had 2 or 3 reports of individuals whose inboxes were empty when
they logged in after the upgrade. I'm still investigating those so I don't
have any info yet...

Thanks in advance for any suggestions you can offer!

-Robin