extremely poor performance with many maiboxes for 'list "" *'

Rob Mueller robm at fastmail.fm
Thu Apr 19 18:37:19 EDT 2007

>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.



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