Hi,

I'm new to haskell and I tried to reproduce the perfomance values from the paper "Regular, Shape-polymorphic, Parallel Arrays in Haskell".

I modified the repa-mmult example from the repa-example package to use the mmultP from Data.Array.Repa.Algorithms.Matrix.

Then I compile it with "ghc -threaded -fglasgow-exts -O Main.hs" but running it with two large matrices :

"./Main -random 4096 4096 -random 4096 4096" I can see that only one of my 4 cpus is utilized.

What am I doing wrong?

Note: The unmodified repa-example also does not run in parallel.

Thx,
Alex
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