On Sun, 2002-11-24 at 17:48, Sam Varshavchik wrote:
> Klavs Klavsen writes:
>
> > Now I'm wanting to use it for my company, which has 100+ users who each
> > has a mailbox of 500+ megs :-( - so I'm ofcourse worried about
> > performance.
> >
> > I've read several people saying that cyrus imapd implements caching of
> > the maildir listings, which in turn gives a great performance boost
> > especially when the user has a lot of Email (which me and the other
> > users do).
>
> Did you also read anyone mentioning the little fact that most IMAP clients
> -- namely Mozilla and MSOE -- cache IMAP mail headers themselves, so they
> never end up requesting the same set of headers the second time; and any
> kind of caching done by the server ends up to be a big waste of time?
>
> > Is this caching in courier-imaps future? or can I do something to
>
> No. It's a complete waste of time.
>
I'm going to use it with IMP - and as far as I know of, it does not
cache the Imap headers. So for the sake of using courier-imap for
webmail - I can't see it's a waste of time. one could state that
imapproxy (a unstable alpha project for IMP) should be used to
intermediate this?
> > Also I would like to use ldap as authentication for courier-imap users.
> > Is this cached or can I do anything to implement this? I guess this
> > should be done serverside - on the ldap server?
>
> authdaemon connects to the ldap server at startup and maintains a persistent
> connection, for all authentication requests.
>
So if I f.ex. request to login several times (because I might be using
webmail - and I'm looking through my folders) it will request for the
User credentials every time.
To me it seems as if courier-imap could benefit from short term caching
of credentials and caching of maildir lists (to avoid heavy IO usage
with 100+ users f.ex.) - and this I would think was the reason Cyrus
implemented it in their imap server.
Am I to understand that you have tried this, and see no performance
gains with caching of credentials or maildir listings. even with 1000s
of emails in several folders for many users.
It would be great to hear what people's experiences with courier-imap is
performance-wise. How many users can be run on one box?
thank you.
--
Regards,
Klavs Klavsen
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