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arXiv · 2206.15418

Distributed asynchronous convergence detection without detection protocol

Guillaume Gbikpi-Benissan·Frederic Magoules
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Abstract

In this paper, we address the problem of detecting the moment when an ongoing asynchronous parallel iterative process can be terminated to provide a sufficiently precise solution to a fixed-point problem being solved. Formulating the detection problem as a global solution identification problem, we analyze the snapshot-based approach, which is the only one that allows for exact global residual error computation. From a recently developed approximate snapshot protocol providing a reliable global residual error, we experimentally investigate here, as well, the reliability of a global residual error computed without any prior particular detection mechanism. Results on a single-site supercomputer successfully show that such high-performance computing platforms possibly provide computational environments stable enough to allow for simply resorting to non-blocking reduction operations for computing reliable global residual errors, which provides noticeable time saving, at both implementation and execution levels.

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Guillaume Gbikpi-Benissan, Frederic Magoules. 2022-06-30. Distributed asynchronous convergence detection without detection protocol. https://doi.org/10.4203/ccp.112.17

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