SpECTRE: A task-based discontinuous Galerkin code for relativistic astrophysics

作者：Kidder Lawrence E; Field Scott E; Foucart Francois; Schnetter Erik; Teukolsky Saul A; Bohn Andy; Deppe Nils; Diener Peter; Hebert Francois; Lippuner Jonas; Miller Jonah; Ott Christian D; Scheel Mark A; Vincent Trevor

来源：Journal of Computational Physics, 2017, 335: 84-114.

DOI：10.1016/j.jcp.2016.12.059

• Discontinuous Galerkin
• Hydrodynamics
• Magnetohydrodynamics
• Task-based parallelism

We 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.

• 出版日期2017-4-15