[Haskell-cafe] Compiling ghc for using STM

Hi, I finally got my spiffy dual-core processor (an Opteron 165 no-less) and want to learn STM, since I think it and haskell are the future of concurrent programming. How do I compile Haskell to be able learn STM on it, using "proper" threading? I know there's a parallel haskell flag, but I read somewhere about it running on top of some special server that lets it work in parallel threads or something. Please excuse me if I'm waffing, can anybody help me? Thanks