Cyrus 2.4.13 memory use

[Lucas Zinato Carraro]

How to estimate the memory usage in cyrus imap 2.4.X ?

Mailbox size is Important ?

For example 5000 simultaneous IMAPS  in  mailboxes  with 2Gb size.
How much memory is needed?





On Wed, Feb 8, 2012 at 10:02 PM, Robert Mueller <robm at fastmail.fm> wrote:
>
>
> > > It looks like 3000 IMAP sessions are going to take around 8 GBytes
> > > of RAM just to run, and we will need to buy additional RAM for
> > > buffer cache. This isn't the end of the world: memory is cheap. I'm
> > > just curious if anyone else saw a similar increase when upgrading
> > > from 2.3 to 2.4.
> >
> > I played a bit fast and loose with memory in 2.4.  You'll find that
> > large mailboxes take quite a bit more memory when selected.  It was a
> > tradeoff against extra locking.  We could save quite a lot by
> > requiring changing
>
> I vote for not adding the extra complexity back.
>
> When a mid-range laptop can come with 8G of RAM, I don't think asking
> for more than 8GB RAM on a server running 3000+ simultaneous IMAP
> connections is a big ask these days.
>
> http://37signals.com/svn/posts/3090-basecamp-nexts-caching-hardware
>
> Rob
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