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I don't get it.. He's using select/EPOLL in python but not Haskell/Erlang. I call FUD on this.

To be fair, he did say that enabling epoll in Erlang had no significant effect on performance.

It has a pretty huge impact on Haskell, http://www.serpentine.com/bos/files/ghc-event-manager.pdf (See page 5 for the graphs).

Why don't you try it?

Epoll for Haskell was heavily experimental and failed to compile when I wrote the article. Enabling epoll in Erlang changed the results by ~1%.