yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Do you know that, appart from the IMAG student working on Python, we 
have also one working on paralellization of Yade during summertime?
If I understand correctly, you run different engines in parallel, but 
engines themselves are not parallelized. Correct?

Bruno



Václav Šmilauer a écrit :
> I just commited ParallelEngine class that uses openmp to run engines in
> parallel. I have 16% speedup on simple-scene.py vs.
> simple-scene-parallel.py (dual-core machine, but the second core is 100%
> used). I think the impact will be bigger on larger simulations. If you
> get mysterious crashes while useing ParallelEngine, run with
> OMP_NUM_THREADS=1 to make sure. Do not use it unless you are sure the
> engines you run in parallel do not touch the same data.
>
> I will soon start to parallelize inner loops of engines where it makes
> sense - like gravity engine, InteractingGeometryMetaEngine,
> InteractionPhysicsMetaEngine. None of the changes will be intrusive,
> though, and compiling without openmp enabled (or /setting
> OMP_NUM_THREADS=1 in the shell) /will keep the old behavior.
>
> For engines that loop over physical actions, that will be more
> complicated, since openmp needs const-time random access to
> integer-indexed elements; we will see.
>
> Please let me know if you get some speedups. Ah, not to forget: use
> gcc>=4.2 to compile.
>
> Vaclav
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> yade-dev@xxxxxxxxxxxxxxxx
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>
>   


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Chareyre Bruno
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