On 21.12.2010, at 19.37, Attila Nagy wrote:
>>> service imap-login {
>>> client_limit = 8
>> Why imap-login with this small client_limit? The default should be ok (1000).
> Because I think that Dovecot's processes block on IO and not just on distinct
> IO operations, but larger tasks, like opening a maildir with a lot of e-mails
> without indexes.
*-login processes do no disk I/O.
> Am I wrong? Or partly wrong, because it uses blocking IO, but it can
> multiplex them, so while one user struggles with the file system to build
> indexes of his maildir, an other client in the same process can happily do
> POP/IMAP stuff?
> The rationale is to spread IO (and users) amongst processes, because the OS
> can schedule them concurrently, but don't have too many processes, because
> that eats a lot of memory and other resources.
This applies to imap/pop3 service, and that's why only client_limit=1 works
well with them for now.
