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arXiv · 2505.15122

Exploring Dynamic Load Balancing Algorithms for Block-Structured Mesh-and-Particle Simulations in AMReX

Amitash Nanda·Md Kamal Hossain Chowdhury·Hannah Ross·Kevin Gott
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Abstract

Load balancing is critical for successful large-scale high-performance computing (HPC) simulations. With modern supercomputers increasing in complexity and variability, dynamic load balancing is becoming more critical to use computational resources efficiently. In this study, performed during a summer collaboration at Lawrence Berkeley National Laboratory, we investigate various standard dynamic load-balancing algorithms. This includes the time evaluation of a brute-force solve for application in algorithmic evaluation, as well as quality and time evaluations of the Knapsack algorithm, an SFC algorithm, and two novel algorithms: a painter's partition-based SFC algorithm and a combination Knapsack+SFC methodology-based on hardware topology. The results suggest Knapsack and painter's partition-based algorithms should be among the first algorithms evaluated by HPC codes for cases with limited weight deviation and will perform at least slightly better than AMReX's percentage-tracking partitioning strategy across most simulations, although effects diminish as weight variety increases.

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Amitash Nanda, Md Kamal Hossain Chowdhury, Hannah Ross, Kevin Gott. 2025-06-17. Exploring Dynamic Load Balancing Algorithms for Block-Structured Mesh-and-Particle Simulations in AMReX. https://doi.org/10.1145/3708035.3736022

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