Benchmarking CFD Simulations: Comparison Challenges on Heterogeneous HPC Systems

Flavio Galeazzo (HLRS)

Abstract

OpenFOAM is a CFD software widely used in both industry and academia, and a well-known memory-bound application. Because of this characteristic, its performance depends heavily on the underlying memory architecture and the type of compute unit employed, making the efficiency of data movement a critical factor in overall speed. In this context, the FVOPS metric (Finite VOlumes solved Per Second) offers a useful way to gauge the achievable peak performance in a given system, helping researchers and engineers quantify how well their hardware can support OpenFOAM simulations. Special attention is given to the performance in CPU-based systems with DDR and HBM memory architectures, and GPU-based systems using unified memory approaches.

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