SC13 Home > SC13 Schedule > SC13 Presentation - Extreme-Scale Space-Time Parallelism

SCHEDULE: NOV 16-22, 2013

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Extreme-Scale Space-Time Parallelism

SESSION: Research Poster Reception

EVENT TYPE: Posters, Electronic Posters, and Education Posters

TIME: 5:15PM - 7:00PM

AUTHOR(S):Daniel Ruprecht, Robert Speck, Matthew Emmett, Matthias Bolten, Rolf Krause

ROOM:Mile High Pre-Function

ABSTRACT:
Time-parallel methods for the integration of time-dependent problems introduce concurrency in the temporal direction in addition to typically used parallelization in space. A recently developed algorithm of this type is the "parallel full approximation scheme in space and time" (PFASST). PFASST performs "sweeps" with a low-order time stepper along a hierarchy of space-time meshes, iteratively computing a collocation solution on multiple time-slices simultaneously. For improved parallel efficiency, an FAS correction allows to use space-time coarsening strategies and thus to reduce the computational cost of sweeps on higher levels. The poster presents novel scaling results of a combination of PFASST with a parallel multi-grid (PMG) solver in space on up to the full IBM Blue Gene/Q system JUQUEEN with 448K cores. It is demonstrated that for large core counts the space-time parallel solver consisting of PFASST plus PMG features significantly better strong scaling capabilities than the pure space-parallel PMG code alone.

Chair/Author Details:

Daniel Ruprecht - University of Lugano

Robert Speck - Forschungzentrum Juelich

Matthew Emmett - Lawrence Berkeley National Laboratory

Matthias Bolten - Universit├Ąt Wuppertal

Rolf Krause - University of Lugano

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