Haskell is 4.2x as good as Erlang at lightweight concurrency. Give it some love.

Re:Haskell is 4.2x as good as Erlang at lightweight concurre... by neilc on Thursday August 20, 2009 @05:14PM (#776288)

Well, fair enough: presumably GHC is creating 5 kernel threads under the covers, whereas the C implementation creates 503 kernel threads. Therefore the C implementation incurs approximately 100x the context-switching overhead. Once again, apples to oranges.

the threads are scheduled amongst the available CPU cores.

Actually, the per-CPU idle stats suggest that the Haskell program ran entirely on a single CPU, so it wasn't actually utilizing all 4 cores anyway.

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Re:Haskell is 4.2x as good as Erlang at lightweight concurre... by jrockway on Thursday August 20, 2009 @05:27PM (#776331)

I think this is because a thread was never actually blocked.

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