Obie took the easy way and simply said 'oh it must be the crappy Twitter code'.
Too bad he is ignoring the very valid points about Ruby's slow runtime, memory usage because you are forced to a per-process mode, lack of proper threading and usage of dynamic languages in large systems.
This problem has been solved well over a year by Phusion Passenger (www.modrails.com) and Ruby Enterprise Edition (www.rubyenterpriseedition.com). It saves you tons of memory.
Too bad he is ignoring the very valid points about Ruby's slow runtime, memory usage because you are forced to a per-process mode, lack of proper threading and usage of dynamic languages in large systems.