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I was just reading up on ROR (haven’t dived into it yet), and I hear that it isn’t thread safe. Obviously, this doesn’t mean that more than one person can’t access your site at one time, so what exactly does it mean? Where do threads come into play in ROR? Do they just mean the request handling?
Your information is out of date. It is thread safe as of 2.2.2
Keep in mind Ruby MRI 1.8.x, the most widely used implementation of Ruby uses Green Threads, so with 1.8.x if you create 100 threads they all run on the same CPU. Therefore when hosting Rails websites using MRI, you probably want as many instances of Ruby running as you have CPUS. Stuff like passenger takes care of this for you.
This used to be a big problem for JRuby, because JRuby has Native threads, and juggling processes seems superfluous. Anyway, its sorted out now.
On an aside, Iron Ruby, the .Net Ruby interpreter runs native threads.
Note: Ruby 1.9.1 uses native threads, but there is still a global interpreter lock in place.