Progress towards accelerating the unified model on hybrid multi-core systemsZhang, W., Xu, M., Evans, K., Norman, M., Morales-Hernandez, M., Mahajan, S., Hill, A., Manners, J., Shipway, B. and Maynard, C. (2021) Progress towards accelerating the unified model on hybrid multi-core systems. In: PASC '21: Platform for Advanced Scientific Computing ConferencE, 5 - 9 July 2021, Geneva, Switzerland, https://doi.org/10.1145/3468267.3470612.
It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing. To link to this item DOI: 10.1145/3468267.3470612 Abstract/Summaryhe cloud microphysics scheme, CASIM, and the radiation scheme, SOCRATES, are two computationally intensive parts within the Met Office’s Unified Model (UM). This study enables CASIM and SOCRATES to use accelerated multi-core systems for optimal com- putational performance of the UM. Using profiling to guide our efforts, we refactored the code for optimal threading and kernel arrangement and implemented OpenACC directives manually or through the CLAW source-to-source translator. Initial porting re- sults achieved 10.02x and 9.25x speedup in CASIM and SOCRATES respectively on 1 GPU compared with 1 CPU core. A granular per- formance analysis of the strategy and bottlenecks are discussed. These improvements will enable UM to run on heterogeneous com- puters and a path forward for further improvements is provided.
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