[Haskell-cafe] Problems with threading?

Don Stewart dons at galois.com
Thu Jun 10 14:36:57 EDT 2010

>     There are 4 sets of "rankings" so -
>     http://shootout.alioth.debian.org/u64/program.php?test=threadring&lang=ghc&
>     id=3
> Yes, but Haskell used to be doing much better specifically on the u64q, which
> was why I was surprised.

Oh, indeed,


Something broke.

Simon Marlow described how best to parallelize this problem extensively


So I'd suggest doing what he says.

In particular, use thread pinning to improve locality.

-- Don

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