Model-led optimisation of a geometric multigrid application

Richard Bunt, Simon Pennycook, Stephen Jarvis, Leigh Lapworth, Yoon Ho

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

This paper details the construction of an analytical performance model of HYDRA, a production nonlinear multigrid solver used by Rolls-Royce for computational fluid dynamics simulations. The model captures both the computational behaviour of HYDRA's key subroutines and the behaviour of its proprietary communication library, OPlus, with an absolute error consistently under 16% on up to 384 cores of an Intel X5650-based commodity cluster. We demonstrate how a performance model can be used to highlight performance bottlenecks and unexpected communication behaviours, thereby guiding code optimisation efforts. Informed by model predictions, we implement an optimisation in OPlus that decreases the communication and synchronisation time by up to 3.01 × and consequently improves total application performance by 1.41 times.

Original languageEnglish
Title of host publicationProceedings - 2013 IEEE International Conference on High Performance Computing and Communications, HPCC 2013 and 2013 IEEE International Conference on Embedded and Ubiquitous Computing, EUC 2013
PublisherIEEE Computer Society
Pages742-753
Number of pages12
ISBN (Print)9780769550886
DOIs
Publication statusPublished - 2014
Event15th IEEE International Conference on High Performance Computing and Communications, HPCC 2013 and 11th IEEE/IFIP International Conference on Embedded and Ubiquitous Computing, EUC 2013 - Zhangjiajie, Hunan, China
Duration: 13 Nov 201315 Nov 2013

Publication series

NameProceedings - 2013 IEEE International Conference on High Performance Computing and Communications, HPCC 2013 and 2013 IEEE International Conference on Embedded and Ubiquitous Computing, EUC 2013

Conference

Conference15th IEEE International Conference on High Performance Computing and Communications, HPCC 2013 and 11th IEEE/IFIP International Conference on Embedded and Ubiquitous Computing, EUC 2013
Country/TerritoryChina
CityZhangjiajie, Hunan
Period13/11/1315/11/13

Keywords

  • fluid dynamics
  • high performance computing
  • modelling
  • performance analysis
  • scientific computing

ASJC Scopus subject areas

  • Software

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