[Dovecot] dovecot 2.1.5 performance

Timo Sirainen tss at iki.fi
Thu Jun 21 12:53:59 EEST 2012

On 21.6.2012, at 11.44, Angel L. Mateo wrote:

> El 20/06/12 12:05, Timo Sirainen escribió:
>>> default_process_limit = 1000
>> Since you haven't enabled high-performance mode for imap-login processes
>> and haven't otherwise changed the service imap-login settings, this
>> means that you can have max. 1000 simultaneous IMAP SSL/TLS connections.
> 	According to http://wiki2.dovecot.org/LoginProcess
> Since one login process can handle only one connection, the service's process_limit setting limits the number of users that can be logging in at the same time (defaults to default_process_limit=100).
> 	I understood this as there can only be up to 100 (or 1000 in my case) concurrently trying to log in, but once the user logs, the imap-login process ends (starting corresponding imap processes) and another users could log in. So there could be more than 100 users connected, but up to 100 trying to connect. Am I wrong?
> 	If I am wrong, why in my system there is no imap-login processes (or just a few) but a lot of imap?

Look at the next sentence also: SSL/TLS proxying processes are also counted here, so if you're using SSL/TLS you'll need to make sure this count is higher than the maximum number of users that can be logged in simultaneously.

I guess you don't have many SSL/TLS connections.

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