|Name:||PRACE ISC Award Winning Paper: Sustained Petascale Performance of Seismic Simulations with SeisSol on SuperMUC|
|Time:||Monday, June 23, 2014
01:15 pm - 02:00 pm
CCL - Congress Center Leipzig
|Speaker:||Michael Bader, TU München|
|Abstract:||Seismic simulations in realistic 3D Earth models require peta- or even exascale compute power to capture small-scale features of high relevance for scientific and industrial applications. In this paper, we present optimizations of SeisSol -- a seismic wave propagation solver based on the Arbitrary high-order accurate DERivative (ADER) Discontinuous Galerkin method on fully adaptive, unstructured tetrahedral meshes -- to run simulations under production conditions at petascale performance. Improvements cover the entire simulation chain: from an enhanced ADER time integration via highly scalable routines for mesh input up to hardware-aware optimization of the innermost sparse-/dense-matrix kernels. Strong and weak scaling studies on the SuperMUC machine demonstrated up to 90% parallel efficiency and 45% floating point peak efficiency on 147k cores. For a simulation under production conditions (10^8 grid cells, 4.8*10^10 degrees of freedom, 5 seconds simulated time), we achieved a sustained performance of 1.09~PFLOPS.
Alexander Breuer, TU München; Alexander Heinecke, TU München; Sebastian Rettenberger; TU München; Michael Bader, TU München; Alice-Agnes Gabriel, LMU München; Christian Pelties, LMU München