Bulletin of the American Physical Society
Mid-Atlantic Section 2022 Meeting
Volume 67, Number 20
Friday–Sunday, December 2–4, 2022; University Park, PA, Pennsylvania State University
Session F01: Poster Session
4:30 PM–4:30 PM,
Saturday, December 3, 2022
Pennsylvania State University
Room: Huck Life Sciences Bld 301, 3rd Flr Bridge
Abstract: F01.00019 : GPU Accelerated MagnetoHydroDynamics for Astrophysics & Testing for Exascale Codes*
Presenter:
Robert Caddy
(University of Pittsburgh)
Authors:
Robert Caddy
(University of Pittsburgh)
Evan Schneider
(University of Pittsburgh)
Cholla is a massively parallel, GPU accelerated, code for modeling astrophysical fluid dynamics. Cholla can harness the incredible power of new GPU accelerated supercomputers like Summit and Frontier to deliver simulations at unprecedented resolutions. My current work is to add magnetic fields to Cholla. Galaxies, and most other systems with plasma, contain significant magnetic fields that may affect their dynamics, so we need to accurately simulate both the magnetic fields and their interaction with matter. Magnetic fields present unique challenges to simulate since they must maintain nearly perfectly zero divergence or the simulation will produce incorrect results, we address this issue using the Constrained Transport algorithm which enforces zero divergence via translating magnetic fluxes to electric fields and then uses those to update the magnetic field.
A testing framework was required for Cholla as the complexity and number of contributors grew. I built a testing framework for Cholla using a mixture of GoogleTest and custom code. This framework works with both automated testing systems (Jenkins & GitHub Actions) and on any system that Cholla itself will run on, including the Summit supercomputer and testbed systems for Frontier. This new framework has enabled faster and more confident development of Cholla and is designed with exascale code in mind.
*NASA ATP grant.
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