[Haskell-cafe] Parallel foldl doesn't work correctly

[Michael Lesniak]

Hello,

> This compiles and if I monitor my CPUs it starts to use both cores, but
> after approx 10 seconds, one core drops to low rate (I'm using a 2 core
> machine).
Just a shot in the dark: what OS are you using? I have had some
problems with GHC 6.10.4 and Ubuntu Karmic Koala{1[, which are fixed
for me in GHC 6.12 RC1.

- Michael

[1] http://www.mlesniak.com/2009/12/01/ghc-6-12-rc1-and-ubuntu-9-10-karmic-koala/