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Rank reordering for MPI communication optimization

Brandfass, Barbara and Thomas, Alrutz and Thomas, Gerhold (2013) Rank reordering for MPI communication optimization. Computers & Fluids, Vol. 80, pp. 372-380. Elsevier. doi: 10.1016/j.compfluid.2012.01.019. ISSN 0045-7930.

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Official URL: http://dx.doi.org/10.1016/j.compfluid.2012.01.019


In this paper we describe a procedure for optimizing the MPI communication of an unstructured CFD code in a parallel multi-core environment. By reordering the MPI ranks, a mapping of MPI processes to CPU cores is established, such that the main communication takes place within the compute nodes. The motivation of this approach is based on the observation that the communication between CPU cores on the same compute node is usually much faster than the communication between CPU cores on different nodes. The generic nature of our approach provides an out-of-the-box optimization tool, which can be easily used with other CFD codes due to the external MPI rank reordering procedure. The optimization tool was successfully tested with the DLR TAU code and the results of the optimization are demonstrated by benchmark computations for different geometries of aircraft configurations.

Item URL in elib:https://elib.dlr.de/75095/
Document Type:Article
Additional Information:Available online: 31 January 2012
Title:Rank reordering for MPI communication optimization
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Brandfass, Barbarabarbara.brandfass (at) dlr.deUNSPECIFIED
Thomas, AlrutzT-Systems Solutions for Research GmbHUNSPECIFIED
Journal or Publication Title:Computers & Fluids
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Volume:Vol. 80
Page Range:pp. 372-380
Keywords:Parallelization, Domain decomposition, Computational Fluid Dynamics, MPI rank reordering
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research (old)
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > C²A²S²E - Center for Computer Applications in AeroSpace Science and Engineering
Deposited By: Brandfass, Barbara
Deposited On:10 Dec 2012 10:25
Last Modified:06 Sep 2019 15:18

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