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08 February 2025
 
  » arxiv » 1609.0098

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SpECTRE: A Task-based Discontinuous Galerkin Code for Relativistic Astrophysics
Lawrence E. Kidder ; Scott E. Field ; Francois Foucart ; Erik Schnetter ; Saul A. Teukolsky ; Andy Bohn ; Nils Deppe ; Peter Diener ; François Hébert ; Jonas Lippuner ; Jonah Miller ; Christian D. Ott ; Mark A. Scheel ; Trevor Vincent ;
Date 1 Sep 2016
AbstractWe introduce a new relativistic astrophysics code, SpECTRE, that combines a discontinuous Galerkin method with a task-based parallelism model. SpECTRE’s goal is to achieve more accurate solutions for challenging relativistic astrophysics problems such as core-collapse supernovae and binary neutron star mergers. The robustness of the discontinuous Galerkin method allows for the use of high-resolution shock capturing methods in regions where (relativistic) shocks are found, while exploiting high-order accuracy in smooth regions. A task-based parallelism model allows efficient use of the largest supercomputers for problems with a heterogeneous workload over disparate spatial and temporal scales. We argue that the locality and algorithmic structure of discontinuous Galerkin methods will exhibit good scalability within a task-based parallelism framework. We demonstrate the code on a wide variety of challenging benchmark problems in (non)-relativistic (magneto)-hydrodynamics. We demonstrate the code’s scalability including its strong scaling on the NCSA Blue Waters supercomputer up to the machine’s full capacity of 22,380 nodes using 671,400 threads.
Source arXiv, 1609.0098
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