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Estimation of Round-off Errors in OpenMP Codes

Abstract : It is crucial to control round-off error propagation in numerical simulations, because they can significantly affect computed results, especially in parallel codes like OpenMP ones. In this paper, we present a new version of the CADNA library that enables the numerical validation of OpenMP codes. With a reasonable cost in terms of execution time, it enables one to estimate which digits in computed results are affected by round-off errors and to detect numerical instabilities that may occur during the execution. The interest of this new OpenMP-enabled CADNA version is shown on various applications, along with performance results on multi-core and many-core (Intel Xeon Phi) architectures.
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Submitted on : Wednesday, October 12, 2016 - 3:07:50 PM
Last modification on : Tuesday, October 25, 2022 - 4:20:20 PM
Long-term archiving on: : Saturday, February 4, 2017 - 8:00:45 PM


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Pacôme Eberhart, Julien Brajard, Pierre Fortin, Fabienne Jézéquel. Estimation of Round-off Errors in OpenMP Codes. IWOMP 2016 - 12th International Workshop on OpenMP, Riken AICS, Oct 2016, Nara, Japan. pp.3-16, ⟨10.1007/978-3-319-45550-1_1⟩. ⟨hal-01380131⟩



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