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Asynchronous-many-task systems: Challenges and opportunities - Scaling an AMR astrophysics code on exascale machines using Kokkos and HPX
Dynamic and adaptive mesh refinement is pivotal in high-resolution, multi-physics, multi-model simulations, necessitating precise physics resolution in localized areas across expansive domains. Today’s supercomputers’ extreme heterogeneity presents a significant challenge for dynamically adaptive codes, highlighting the importance of achieving performance portability at scale. Our research focuses on astrophysical simulations, particularly stellar mergers, to elucidate early universe dynamics. Here, we present Octo-Tiger, leveraging Kokkos, HPX, and SIMD for portable performance at scale in complex, massively parallel adaptive multi-physics simulations. Octo-Tiger supports diverse processors, accelerators, and network backends. Experiments demonstrate exceptional scalability across several heterogeneous supercomputers including Perlmutter, Frontier, and Fugaku, encompassing major GPU architectures and x86, ARM, and RISC-V CPUs. Parallel efficiency of 47.59% (110,080 cores and 6880 hybrid A100 GPUs) on a full-system run on Perlmutter (26% HPCG peak performance) and 51.37% (using 32,768 cores and 2048 MI250X) on Frontier are achieved.
Nyx: A Massively Parallel AMR Code for Computational Cosmology
Nyx is a highly parallel, adaptive mesh, finite-volume N-body compressible hydrodynamics solver for cosmological simulations. It has been used to simulate different cosmological scenarios with a recent focus on the intergalactic medium and Lyman alpha forest. Together, Nyx, the compressible astrophysical simulation code, Castro, and the low Mach number code MAESTROeX, make up the AMReX-Astrophysics Suite of open-source, adaptive mesh, performance-portable astrophysical simulation codes. Other examples of cosmological simulation research codes include Enzo, Enzo-P/Cello, RAMSES, ART, FLASH, Cholla, as well as Gadget, Gasoline, Arepo, Gizmo, and SWIFT.
Preshot Predictions for LA-43S-1 using the Eulerian AMR Code Roxane
The Ranchero Magnetic Flux Compression Generator (FCG) has been used to create current pulses in the 10-100 MA range for driving both “static” low inductance (0.5 nH) loads1 for generator demonstration purposes and high inductance (10-20 nH) imploding liner loads for ultimate use in physics experiments at very high energy density. This report offers a description of these efforts.
FLEXO: Development of a Portably Performant AMR Code for XHMD.
Abstract not provided.
Improving DFEM Transport Performance on Cell-Based AMR Meshes [Slides]
Abstract not provided.
AMR Magnetic Sensors in Flux Expulsion Studies [Poster]
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AMR Indicator Effects on Reactive Flow Behavior
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Performance analysis of Open MPI on AMR applications over Slingshot-11
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VTO AMR - NEXT-DRIVE Task 1: Power Semiconductor Devices
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Parallel unstructured AMR and gigabit networking for Beowulf-class clusters
The impact of gigabit networking with Myrinet 2000 hardware and MPICH-GM software on a 2-way SMP Beowulf-class cluster for parallel unstructured adaptive mesh refinement using the PYRAMID library is described.
Whole Genome Sequencing of ISS Environmental Microorganisms Enables Description of Novel Microbial Lineages and Prediction of AMR Function
No abstract provided
Grafting AMR Capability Into the Diffusion Package of an Existing ALE Code
Abstract not provided