Hi Alexander,
On 07/11/13 09:40, Alexander Herz wrote:
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?
Probably, not running with ./Main +RTS -N -RTS ...
http://www.haskell.org/ghc/docs/7.6.3/html/users_guide/using-smp.html#parallel-options
Note: The unmodified repa-example also does not run in parallel.
Thx,
Alex
Claude
--
http://mathr.co.uk
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