@inproceedings{333122fbefc44ffcafff30d8417b41a4,
title = "Model-led optimisation of a geometric multigrid application",
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.",
keywords = "fluid dynamics, high performance computing, modelling, performance analysis, scientific computing",
author = "Richard Bunt and Simon Pennycook and Stephen Jarvis and Leigh Lapworth and Yoon Ho",
year = "2014",
doi = "10.1109/HPCC.and.EUC.2013.109",
language = "English",
isbn = "9780769550886",
series = "Proceedings - 2013 IEEE International Conference on High Performance Computing and Communications, HPCC 2013 and 2013 IEEE International Conference on Embedded and Ubiquitous Computing, EUC 2013",
publisher = "IEEE Computer Society",
pages = "742--753",
booktitle = "Proceedings - 2013 IEEE International Conference on High Performance Computing and Communications, HPCC 2013 and 2013 IEEE International Conference on Embedded and Ubiquitous Computing, EUC 2013",
address = "United States",
note = "15th IEEE International Conference on High Performance Computing and Communications, HPCC 2013 and 11th IEEE/IFIP International Conference on Embedded and Ubiquitous Computing, EUC 2013 ; Conference date: 13-11-2013 Through 15-11-2013",
}