ExCALIBUR HES Benchmarking for Performance Portable Applications

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Application benchmarking is a crucial activity in the UK's path to Exascale. It ensures future Exascalesystems are understood by the community so that UK Science Applications, particularly thosedeveloped as part of ExCALIBUR, can take advantage of the scientific opportunities at Exascale. Linearsolvers are a ubiquitous pattern in many ExCALIBUR codes, and this project will develop a suitablebenchmark applicable to many of UK codes. Application benchmarks are part of the enabling softwarestack that allows the performance of hardware to be assessed for scientific workloads .It is vital to rigorously measure the performance of benchmarks in a systematic way to enhance thetransparency and enable reproducibility. International conferences in this space are now mandatingreproducibility information. This project provides the tooling to make collecting and analysingperformance data straightforward. This will allow application owners to develop the skills andexperience to measure the performance of their code across the gamut of the UK's supercomputerfacilities, and improve their code based on benchmarking as they target Exascale.The increasing diversity of computer architectures now requires applications to strive to bePerformance Portable (PP); that is, achieve a high level of efficiency on a range of different processorswith minimal changes to the source code. Measuring PP using analysis such as those in our recentstudies needs to become as common in HPC as scaling tests or roofline analyses. This is especiallytrue for ExCALIBUR codes, where the likely Exascale architectures may not be known for several years.This project will ensure this vital PP analysis can become ubiquitous in HPC software development.The ReFrame tool has been developed by the CSCS and ETH Zurich to aid in the automated collectionof performance data. ReFrame is an already established approach within ExCALIBUR. This project willaugment the rudimentary performance analysis available in ReFrame to include our own PPMethodology developed with collaborators at Intel . By incorporating this alongside the BenchmarkingInitiative, we will empower the supercomputing community in the UK to measure the performanceportability of their code across the UK's HPC infrastructure. This aligns with the H&ES mission to readyUK codes and software for Exascale.