Miserable performance of cyrus-imapd 2.3.9 -- seems to be locking issues

[Pascal Gienger]

Jeff Fookson <jfookson at as.arizona.edu> wrote:

> Databases are all skiplist.

As a rule of thumb, do not use skiplist for the duplicate delivery 
suppression database (deliver.db). Even if everybody hates it, use 
BerkeleyDB, Version 4.4.52 or higher. Give it a quite fair amount of shared 
memory. And run cyr_expunge often to prune that database so that no entry 
is older than - say - 3 days.

We have approx 10-15 messages/sec incoming on one node.