If you are concerned with Ruby and scalability, use JRuby on top of Tomcat. It does give you a few pieces of magical scalability, however (and more importantly)

If you are concerned with Ruby and scalability, use JRuby on top of Tomcat. It does give you a few pieces of magical scalability, however (and more importantly) it allows you to work with "enterprisey" Java tools/libraries/systems that allow you to reach reasonable levels of scalability quickly. And read this - http://www.ruby-forum.com/topic/1119702 http://www.ruby-forum.com/topic/1119702