| Re: [eigen] Eigens Parallellism |
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On 02.07.2012 19:53, Cassanova, Bill wrote:
I am seeking a better understand of Eigen's parallelism logic....
- My understanding is that Eigen "Knows" and understands
OpenMP..I believe I read somewhere that enabling OpenMP is simply a
matter of including -fopenmp on the compile line...Is this really all
there is to it?
Yes, Eigen basically just checks whether openmp is enabled (and
EIGEN_DONT_PARALLELIZE is not defined):
http://eigen.tuxfamily.org/dox/TopicMultiThreading.html
- To what degree does the code get auto-magically
transformed into an OpenMP directive? For example...In the code
below.
As of now, only matrix-matrix product and PartialPivLU profit from
multithreading (see same link).
- Are there any plans for the future to incorporate not only
OpenMP but also some MPI implementation?
I don't know, but I don't think anyone is working on it right now.
- Are there plans for Eigen to use some form of GPU
processing?
Same here.
Example Code -----------------------
[...]
Your code hardly uses any Eigen instructions. It uses Eigen mostly just
for data holding which, I guess, can't profit from parallelization much.
Of course Eigen will not prevent you from parallizing these parts
yourself, but it won't automatically parallize your code.
HTH,
Christoph
--
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Dipl.-Inf. Christoph Hertzberg
Cartesium 0.049
Universität Bremen
Enrique-Schmidt-Straße 5
28359 Bremen
Tel: +49 (421) 218-64252
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