= Tuning \Rainbows!

Most of the {tuning notes}[http://unicorn.bogomips.org/TUNING.html]
apply to \Rainbows! as well.  \Rainbows! is not particularly optimized
at the moment and is designed for applications that spend large amounts
of the time waiting on network activity.  Thus memory usage and memory
bandwidth for keeping connections open are often limiting factors as
well.

== \Rainbows! configuration

* Don't set +worker_connections+ too high.  It is often better to start
  denying requests and only serve the clients you can than to be
  completely bogged down and be unusable for everybody.

* Increase +worker_processes+ if you have resources (RAM/DB connections)
  available.  Additional worker processes can better utilize SMP, are more
  robust against crashes and are more likely to be fairly scheduled by
  the kernel.

== nginx configuration

If you intend to use nginx as a reverse-proxy in front of \Rainbows!  to
handle Comet applications, make sure you disable proxy response
buffering in nginx:

  proxy_buffering off;

This can be disabled on a per-backend basis in nginx, so under no
circumstances should you disable response buffering to Unicorn
backends, only to \Rainbows! backends.