AUTHOR=Min Misun , Lan Yu-Hsiang , Fischer Paul , Rathnayake Thilina , Holmen John 

TITLE=Nek5000/RS performance on advanced GPU architectures

JOURNAL=Frontiers in High Performance Computing

VOLUME=Volume 2 - 2024

YEAR=2025

URL=https://www.frontiersin.org/journals/high-performance-computing/articles/10.3389/fhpcp.2024.1303358

DOI=10.3389/fhpcp.2024.1303358

ISSN=2813-7337

ABSTRACT=The authors explore performance scalability of the open-source thermal-fluids code, NekRS, on the U.S. Department of Energy's leadership computers, Crusher, Frontier, Summit, Perlmutter, and Polaris. Particular attention is given to analyzing performance and time-to-solution at the strong-scale limit for a target efficiency of 80%, which is typical for production runs on the DOE's high-performance computing systems. Several examples of anomalous behavior are also discussed and analyzed.