I manage a single-instance server running v2.2.12 with a reasonably large number of mailboxes, using "mboxlist_db: flat":
Why are you using "flat"? The flat db implementation is pretty basic/kludgy and not designed for large database files. I bet it's doing something stupid like re-reading the file from scratch for each record or something like that (I've seen it try to rewrite a file on every record when coverting from skiplist -> flat)
Convert it to a skiplist and use that instead, much, much better performance with up to millions of mailboxes.
http://cyrusimap.web.cmu.edu/twiki/bin/view/Cyrus/WhatDatabaseBackend Rob ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
