Donald:
Yeah, there's some known low level issues in the code generator
regarding heap and stack checks inside loops, and the use of registers
on x86.
But note this updated paper,
http://www.cse.unsw.edu.au/~chak/papers/CLPKM07.html
Add another core to your machine and it is no longer 4x slower :)
Add 15 more cores and its really no longer 4x slower :
Maybe this is yet another newbie stupid question, but do you mean that
GHC does automatic multi-threading? (Haskell seems very suitable for
that) Otherwise adding an extra core does not really help does it?
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