The whitepapers document the work done in work package 11 “Prototyping” of the PRACE-2IP project.

Author: Massimiliano Culpo, CINECA, Via Magnanelli 6/3, Casalecchio di Reno (BO) I-40033, Italy

Abstract: The scaling behavior of different OpenFOAM versions is analyzed on two benchmark problems. Results show that the applications scale reasonably well up to a thousand tasks. An in-depth profiling identifies the calls to the MPI_Allreduce function in the linear algebra core libraries as the main communication bottleneck. A sub-optimal performance on-core is due to the sparse matrices storage format that does not employ any cache-blocking mechanism at present. Possible strategies to overcome these limitations are proposed and analyzed, and preliminary results on prototype implementations are presented.

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These whitepapers have been prepared by the PRACE Implementation Phase Projects and in accordance with the Consortium Agreements and Grant Agreements n° RI-261557, n°RI-283493, or n°RI-312763.

They solely reflect the opinion of the parties to such agreements on a collective basis in the context of the PRACE Implementation Phase Projects and to the extent foreseen in such agreements. Please note that even though all participants to the PRACE IP Projects are members of PRACE AISBL, these whitepapers have not been approved by the Council of PRACE AISBL and therefore do not emanate from it nor should be considered to reflect PRACE AISBL’s individual opinion.

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© 2014 PRACE Consortium Partners. All rights reserved. This document is a project document of a PRACE Implementation Phase project. All contents are reserved by default and may not be disclosed to third parties without the written consent of the PRACE partners, except as mandated by the European Commission contracts RI-261557, RI-283493, or RI-312763 for reviewing and dissemination purposes.

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