[cosmo-dev] Cosmo performance and scalability

[Brian Moseley]

On Wed, Jun 4, 2008 at 11:55 AM, Randy Letness <randy at osafoundation.org> wrote:
> I'm not aware of any big cosmo installations, other than the hub service,
> which currently has around 9K users, 400 unique users a day, 13K calendars,
> 170K items. In order to support 500K - 1M users, you would probably need a
> big database server, and multiple cosmo application servers behind a load
> balancer. In theory this should work, but there are some issues such as
> configuring the server to use a distributed cache (cosmo uses the 2nd level
> cache in Hibernate) that we haven't attempted yet. It also depends on what
> types of users you want to support. For instance, cosmo was designed to
> support more chandler desktop users than caldav users as the morse code
> protocol requires far less resources than caldav.

there may also be hidden web session synchronization issues, as the
web UI depends on session storage for login state. or has that changed
recently?