I think you need to specify how many cores to use when you call your ./Main program. Something like "./Main -random 4096 4096 -random 4096 4096 +RTS -N4" (given that you have 4 cores). You'll also need to add -rtsopts when you're compiling your code with ghc.
On Thu, Nov 7, 2013 at 1:40 AM, Alexander Herz <alexander.h...@mytum.de>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? > > Note: The unmodified repa-example also does not run in parallel. > > Thx, > Alex > _______________________________________________ > Haskell mailing list > Haskell@haskell.org > http://www.haskell.org/mailman/listinfo/haskell >
_______________________________________________ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell
