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- research-articleNovember 2022
Optimization of full-core reactor simulations on summit
- Misun Min,
- Yu-Hsiang Lan,
- Paul Fischer,
- Elia Merzari,
- Stefan Kerkemeier,
- Malachi Phillips,
- Thilina Rathnayake,
- April Novak,
- Derek Gaston,
- Noel Chalmers,
- Tim Warburton
SC '22: Proceedings of the International Conference on High Performance Computing, Networking, Storage and AnalysisNovember 2022, Article No.: 74, pp 1–11Nek5000/RS, a highly-performant open-source spectral element code, has recently achieved an unprecedented milestone in the simulation of nuclear reactors: the first full core computational fluid dynamics simulations of reactor cores, including pebble ...
- research-articleJanuary 2022
Performance tuning of the Helmholtz matrix-vector product kernel in the computational fluid dynamics solver Nek5000/RS for the A64FX processor
HPCAsia 2022 Workshop: International Conference on High Performance Computing in Asia-Pacific Region WorkshopsJanuary 2022, pp 49–59https://doi.org/10.1145/3503470.3503476Nek5000/RS is an open source computational fluid dynamics solver based on the spectral element method. One of the important kernel of the Nek5000/RS is called “axhelm”, which computes the Helmholtz matrix-vector product. In this paper, we have ...
- research-articleNovember 2017
Why is MPI so slow?: analyzing the fundamental limits in implementing MPI-3.1
- Ken Raffenetti,
- Abdelhalim Amer,
- Lena Oden,
- Charles Archer,
- Wesley Bland,
- Hajime Fujita,
- Yanfei Guo,
- Tomislav Janjusic,
- Dmitry Durnov,
- Michael Blocksome,
- Min Si,
- Sangmin Seo,
- Akhil Langer,
- Gengbin Zheng,
- Masamichi Takagi,
- Paul Coffman,
- Jithin Jose,
- Sayantan Sur,
- Alexander Sannikov,
- Sergey Oblomov,
- Michael Chuvelev,
- Masayuki Hatanaka,
- Xin Zhao,
- Paul Fischer,
- Thilina Rathnayake,
- Matt Otten,
- Misun Min,
- Pavan Balaji
SC '17: Proceedings of the International Conference for High Performance Computing, Networking, Storage and AnalysisNovember 2017, Article No.: 62, pp 1–12https://doi.org/10.1145/3126908.3126963This paper provides an in-depth analysis of the software overheads in the MPI performance-critical path and exposes mandatory performance overheads that are unavoidable based on the MPI-3.1 specification. We first present a highly optimized ...
- research-articleJune 2012
I/O threads to reduce checkpoint blocking for an electromagnetics solver on Blue Gene/P and Cray XK6
ROSS '12: Proceedings of the 2nd International Workshop on Runtime and Operating Systems for SupercomputersJune 2012, Article No.: 2, pp 1–8https://doi.org/10.1145/2318916.2318919Application-level checkpointing has been one of the most popular techniques to proactively deal with unexpected failures in supercomputers with hundreds of thousands of cores. Unfortunately, this approach results in heavy I/O load and often causes I/O ...
