To jump on the band-wagon of Phusion Passenger we\'ve setup a staging server for a small rails app to test things out.
So far it has been very nice to use, it makes
RE:
# Additionally keep a copy of the Rails framework in memory. If you're
# using multiple apps on the same version of Rails, this will speed up
# the creation of new RailsAppSpawners. This isn't necessary if you're
# only running one or 2 applications, or if your applications use
# different versions of Rails.
RailsFrameworkSpawnerIdleTime 0
Just something to add and might be useful.
The default spawn method in the current release is "smart-lv2", which skips the framework spawner, so setting the framework spawner timeout wouldn't have effect anyway unless you explicitly set the spawn method to "smart".
Source: http://groups.google.com/group/phusion-passenger/browse_thread/thread/c21b8d17cdb073fd?pli=1