Lattice Boltzmann Simulations at Petascale on Multi-GPU Systems with Asynchronous Data Transfer and Strictly Enforced Memory Read Alignment

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Internal Authors/Editors


Publication Details

List of Authors: Fredrik Robertsén, Jan Westerholm, Keijo Mattila
Editors: Daneshtalab Masoud, Aldinucci Marco, Leppänen Ville, Lilius Johan, Brorsson Mats
Publication year: 2015
Journal: Euromicro International Conference on Parallel, Distributed and Network-Based Processing
Publisher: IEEE
Book title: Parallel, Distributed and Network-Based Processing (PDP), 2015 23rd Euromicro International Conference on
Start page: 604
End page: 609
ISBN: 978-1-4799-8492-3
ISSN: 1066-6192


Abstract

The lattice Boltzmann method is a well-established numerical approach for complex fluid flow simulations. Recently general-purpose graphics processing units have become accessible as high-performance computing resources at large-scale. We report on implementing a lattice Boltzmann solver for multi-GPU systems that achieves 0.69 PFLOPS performance on 16384 GPUs. In addition to optimizing the data layout on the GPUs and eliminating the halo sites, we make use of the possibility to overlap data transfer between the host CPU and the device GPU with computing on the GPU. We simulate flow in porous media and measure both strong and weak scaling performance with the emphasis being on a large scale simulation using realistic input data.


Keywords

GPU, Lattice Boltzmann methods

Last updated on 2019-15-10 at 02:45