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Performance-Portable Numerical Relativity with AthenaK

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arxiv 2409.10383 v1 pith:QKSCLO6L submitted 2024-09-16 gr-qc astro-ph.HEastro-ph.IM

Performance-Portable Numerical Relativity with AthenaK

Hengrui Zhu , Jacob Fields , Francesco Zappa , David Radice , James Stone , Alireza Rashti , William Cook , Sebastiano Bernuzzi
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Boris Daszuta
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classification gr-qc astro-ph.HEastro-ph.IM
keywords athenaknumericalrelativityfrontiergpusscalingcomputingexascale
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We present the numerical relativity module within AthenaK, an open source performance-portable astrophysics code designed for exascale computing applications. This module employs the Z4c formulation to solve the Einstein equations. We demonstrate its accuracy through a series of standard numerical relativity tests, including convergence of the gravitational waveform from binary black hole coalescence. Furthermore, we conduct scaling tests on OLCF Frontier and NERSC Perlmutter, where AthenaK exhibits excellent weak scaling efficiency of 80% on up to 65,536 AMD MI250X GPUs on Frontier (relative to 4 GPUs) and strong scaling efficiencies of 84% and 77% on AMD MI250X and NVIDIA A100 GPUs on Frontier and Perlmutter respectively. Additionally, we observe a significant performance boost, with two orders of magnitude speedup ($\gtrsim 200\times$) on a GPU compared to a single CPU core, affirming that AthenaK is well-suited for exascale computing, thereby expanding the potential for breakthroughs in numerical relativity research.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Trapping, Irregular Waveforms, and Efficient Radiation in Ultra-relativistic Black Hole Encounters

    gr-qc 2026-04 unverdicted novelty 7.0

    Ultra-relativistic black hole flybys can radiate over 65% of their energy in gravitational waves via irregular waveforms caused by radiation trapping and lensing, without coalescence.

  2. GRACE: An Open-Source Framework for GPU-Accelerated Numerical Relativity

    gr-qc 2026-07 accept novelty 6.0

    GRACE is a validated, open-source, Kokkos+p4est GPU-portable framework that evolves ideal GRMHD with constrained transport self-consistently coupled to Z4c Einstein equations on fixed or adaptive meshes.

  3. Magnetic field dynamics in isolated neutron stars with an external dipole field

    astro-ph.HE 2026-05 unverdicted novelty 5.0

    Long-term numerical relativity simulations find that neutron star magnetic fields relax to stable mixed configurations with toroidal energy fraction ≲10% within one Alfvén time after Tayler instability saturation.

  4. Magnetic field dynamics in isolated neutron stars with an external dipole field

    astro-ph.HE 2026-05 unverdicted novelty 5.0

    Long-term numerical-relativity runs find isolated neutron stars with an external dipole relax to a stable mixed poloidal-toroidal field with toroidal energy ≲10% after Tayler saturation.