LFRic: Meeting the challenges of scalability and performance portability in Weather and Climate models

S. V. Adams, R. W. Ford, M. Hambley, J. M. Hobson, I. Kavcic, C. M. Maynard, T. Melvin, Eike Müller, S. Mullerworth, A. R. Porter, M. Rezney, B. J. Shipway, R. Wong

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Abstract

This paper describes LFRic: the new weather and climate modelling system being developed by the UK Met Office to replace the existing Unified Model in preparation for exascale computing in the 2020s. LFRic uses the GungHo dynamical core and runs on a semi-structured cubed-sphere mesh. The design of the supporting infrastructure follows object-oriented principles to facilitate modularity and the use of external libraries where possible. In particular, a ‘separation of concerns’ between the science code and parallel code is imposed to promote performance portability. An application called PSyclone, developed at the STFC Hartree centre, can generate the parallel code enabling deployment of a single source science code onto different machine architectures. This paper provides an overview of the scientific requirement, the design of the software infrastructure, and examples of PSyclone usage. Preliminary performance results show strong scaling and an indication that hybrid MPI/OpenMP performs better than pure MPI.

Original languageEnglish
Pages (from-to)383-396
Number of pages14
JournalJournal of Parallel and Distributed Computing
Volume132
Early online date21 May 2019
DOIs
Publication statusPublished - 1 Oct 2019
EventExascale Applications and Software 2018 - Edinburgh, UK United Kingdom
Duration: 17 Apr 201819 Apr 2018
http://www.easc2018.ed.ac.uk/

Keywords

  • Domain specific language
  • Exascale
  • Numerical weather prediction
  • Separation of concerns

ASJC Scopus subject areas

  • Software
  • Theoretical Computer Science
  • Hardware and Architecture
  • Computer Networks and Communications
  • Artificial Intelligence

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    Adams, S. V., Ford, R. W., Hambley, M., Hobson, J. M., Kavcic, I., Maynard, C. M., Melvin, T., Müller, E., Mullerworth, S., Porter, A. R., Rezney, M., Shipway, B. J., & Wong, R. (2019). LFRic: Meeting the challenges of scalability and performance portability in Weather and Climate models. Journal of Parallel and Distributed Computing, 132, 383-396. https://doi.org/10.1016/j.jpdc.2019.02.007