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      Chip-level and multi-node analysis of energy-optimized lattice-Boltzmann CFD simulations

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          Abstract

          Memory-bound algorithms show complex performance and energy consumption behavior on multicore processors. We choose the lattice-Boltzmann method (LBM) on an Intel Sandy Bridge cluster as a prototype scenario to investigate if and how single-chip performance and power characteristics can be generalized to the highly parallel case. First we perform an analysis of a sparse-lattice LBM implementation for complex geometries. Using a single-core performance model, we predict the intra-chip saturation characteristics and the optimal operating point in terms of energy to solution as a function of implementation details, clock frequency, vectorization, and number of active cores per chip. We show that high single-core performance and a correct choice of the number of active cores per chip are the essential optimizations for lowest energy to solution at minimal performance degradation. Then we extrapolate to the MPI-parallel level and quantify the energy-saving potential of various optimizations and execution modes, where we find these guidelines to be even more important, especially when communication overhead is non-negligible. In our setup we could achieve energy savings of 35% in this case, compared to a naive approach. We also demonstrate that a simple non-reflective reduction of the clock speed leaves most of the energy saving potential unused.

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          Most cited references 23

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          KMCLib A general framework for lattice kinetic Monte Carlo (KMC) simulations

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            Power-Management Architecture of the Intel Microarchitecture Code-Named Sandy Bridge

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              A high-performance lattice Boltzmann implementation to model flow in porous media

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                Author and article information

                Journal
                2013-04-29
                2015-05-22
                Article
                10.1002/cpe.3489
                1304.7664

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                Custom metadata
                23 pages, 13 figures; post-peer-review version
                cs.PF cs.DC

                Performance, Systems & Control, Networking & Internet architecture

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