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DTSTAMP:20190719T085745Z
LOCATION:HG E 1.2
DTSTART;TZID=Europe/Stockholm:20190614T133000
DTEND;TZID=Europe/Stockholm:20190614T140000
UID:submissions.pasc-conference.org_PASC19_sess144_msa238@linklings.com
SUMMARY:StagBL and StagYY: Developing Tools for Large-Scale Geodynamic Sim
 ulations Using Staggered-Grid Discretisation on Hybrid Architectures
DESCRIPTION:Minisymposium\nComputer Science and Applied Mathematics, Physi
 cs, Solid Earth Dynamics\n\nStagBL and StagYY: Developing Tools for Large-
 Scale Geodynamic Simulations Using Staggered-Grid Discretisation on Hybrid
  Architectures\n\nSanan, Tackley\n\nStagYY is a geodynamic simulation code
  developed and employed over the last decade, providing models of the evol
 ution of the entire mantle and lithosphere of Earth and other planets on m
 ulti-billion-year timescales. As the field advances, additional flexibilit
 y is required to leverage modern solvers and architectures, in particular 
 scalable solvers robust to large, discontinuous, non-grid-align coefficien
 t (viscosity) variations and amenable to accelerations with coprocessors (
 e.g. GPUs). Here, we discuss two recent efforts to provide this. First, we
  discuss recently-introduced GPU accelerated kernels for Stokes operator a
 pplication within geometric multigrid solves, addressing a computational b
 ottleneck and showing speedup on the Piz Daint hybrid supercomputer for a 
 3D spherical simulation. We also discuss recent developments in leveraging
  the StagBL library to provide new solver options within StagYY. StagBL is
  an open-source parallel solver and discretization library for geodynamic 
 simulation, encapsulating and optimizing operations essential to staggered
 -grid finite volume Stokes flow solvers. In particular, we demonstrate the
  effectiveness of allowing flexibility in coarse grid solver within the mu
 ltigrid hierarchy.
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