Ruby 1.9.3-rc1 (and presumably -p0) fixed all manner of memory leak issues I was experiencing in Rails apps (Ruby 1.9.2-p290 + Rails 3.1 + Passenger 3.0.9 + Nginx). This was on top of the loading slowness of Ruby 1.9.2 with Rails.
Went from leaking MBs per request to no leakage for days.
Went from leaking MBs per request to no leakage for days.