Question

I’ve been reading a number of tutorials on Haskell. However, I have not been able to get the compiled application to run on a multicore (I have an Intel Quad Core) on windows (32 bit).

I have tried a number of things:

• ghc -O2 –make A.hs -threaded
• ./real-par +RTS -N2
• ./real-par +RTS -N4

But no luck.

The compiled application runs 100% on one core only.

Any ideas?

Code:

import Control.Parallel import Control.Monad import Text.Printf  fib :: Int -> Int fib 0 = 0 fib 1 = 1 fib n = l `pseq` r `pseq` l+r     where     l = fib (n-1)     r = fib (n-2)  main = forM_ [0..350] $ \i ->         printf 'n=%d => %d\n' i (fib i) 

Answer 1

If vili is correct (I can’t test as I don’t own any MS boxes), it might be related to this bug