mailboxes.db locking problem after updating from 2.4 to 2.5.9

[Bron Gondwana]

On Fri, 18 Nov 2016, at 10:51, Wolfgang Breyha via Info-cyrus wrote:
> On 17/11/16 14:00, Deniss via Info-cyrus wrote:
> > Any ideas or suggestion for investigation ?
> 
> I already filed a bug
> https://github.com/cyrusimap/cyrus-imapd/issues/43
> but no response so far. I directly asked Bron, but no response as well.

Sorry, I really don't have a clue.  2.5 does have a different mailboxes.db format, so it's a bit more CPU intensive.  The real massive win for CPU usage is going to come with reverse ACLs:

https://blog.fastmail.com/2015/12/05/reverse-acls-making-imap-list-fast/

But to get there, we need to solve reverse ACLs for groups.  I did ask about it here:

https://lists.andrew.cmu.edu/pipermail/info-cyrus/2015-November/038628.html

But then didn't follow up to add group reverse ACL support in Cyrus, so reverse ACLs are broken if you're using groups.

Bron.

-- 
  Bron Gondwana
  brong at fastmail.fm