[Dovecot] How many concurrent IMAP sessions?

[Timo Sirainen]

On Wed, 2009-09-30 at 17:08 +0200, Patrick Ben Koetter wrote:
> Has anybody ever bothered to measure how many concurrent IMAP sessions dovecot
> can handle?
> 
> I know it depends on hardware, filesystem, mailbox type etc., but what exactly
> controls the number and what have people on the list measured?

I think disk I/O limit comes first, then memory and finally CPU. I just
tested on my desktop:

imaptest clients=1000 - noop=100 delay=100 logout=0

So it basically just issues NOOP commands and does no disk I/O (opens no
index files or anything). Looks like each imap process uses about 420 kB
of memory (420 MB total according to "free" before/after). That's
actually more than I thought. Wonder if I could decrease it..
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