SCHEDULE: NOV 16-22, 2013

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Solving the Compressible Navier-Stokes Equations on up to 1.97 Million Cores and 4.1 Trillion Grid Points

SESSION: Extreme-Scale Applications

EVENT TYPE: Papers

TIME: 2:00PM - 2:30PM

SESSION CHAIR: Michael A. Heroux

AUTHOR(S):Ivan Bermejo-Moreno, Julien Bodart, Johan Larsson, Blaise Barney, Joseph Nichols, Steve Jones

ROOM:201/203

ABSTRACT:
We present weak and strong scaling studies as well as performance analyses of the Hybrid code, a finite-difference solver of the compressible Navier-Stokes equations on structured grids used for the direct numerical simulation of isotropic turbulence and its interaction with shock waves. Parallelization is achieved through MPI, emphasizing the use of non-blocking communication with concurrent computation. The simulations, scaling and performance studies were done on the Sequoia, Vulcan and Vesta Blue Gene/Q systems, the first two accounting for a total of 1,966,080 cores when combined. The maximum number of grid points simulated was 4.12 trillion, with a memory usage of approximately 1.6 PB. We discuss the use of hyperthreading, which significantly improves the parallel performance of the code on this architecture.

Chair/Author Details:

Michael A. Heroux (Chair) - Sandia National Laboratories

Ivan Bermejo-Moreno - Stanford University

Julien Bodart - Stanford University

Johan Larsson - University of Maryland

Blaise Barney - Lawrence Livermore National Laboratory

Joseph Nichols - Stanford University

Steve Jones - Stanford University

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The full paper can be found in the ACM Digital Library