[Pw_forum] scalability of the code

Paolo Giannozzi giannozz at democritos.it
Tue Feb 7 12:04:55 CET 2012

On Tue, 2012-02-07 at 11:25 +0100, Gabriele Sclauzero wrote:

> The OpenMP parallelization is useful only if the code stops
> complaining that there are not enough plane waves. In my experience, 
> before that number of processors is reached, the MPI parallelization
> gives much better performances than the OpenMP one, probably because
> there are still several parts of the code that have not been "threaded" so far.

I guess you are referring to PWscf. I have been working with the
Car-Parrinello code instead, which shows good OpenMP scalability.
In any case, things are (slowly) improving for OpenMP parallelization
in all codes.


Paolo Giannozzi, IOM-Democritos and University of Udine, Italy

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