BackgroundDRb, Mongrel, Long actions

Hello G.s!

Lets discuss the following problem:

I have a rails project and want to use mongrel to host it on my server.
Server is powerful IBM XServe 348 and used only for my project. I have
an action, that creates a graphs, using graphviz from form results. It
takes my server about 10 seconds or less to complete it. How do you
think what mongrel configuration should i use? And should i use
BackgrounDRb? If so how should i do it.