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Doubt and Redundancy Kill Soft Errors---Towards Detection and Correction of Silent Data Corruption in Task-based Numerical Software

Samfass, Philipp; Weinzierl, Tobias; Reinarz, Anne; Bader, Michael

Doubt and Redundancy Kill Soft Errors---Towards Detection and Correction of Silent Data Corruption in Task-based Numerical Software Thumbnail


Authors

Philipp Samfass

Michael Bader



Abstract

Resilient algorithms in high-performance computing are subject to rigorous non-functional constraints. Resiliency must not increase the runtime, memory footprint or I/O demands too significantly. We propose a task-based soft error detection scheme that relies on error criteria per task outcome. They formalise how “dubious” an outcome is, i.e. how likely it contains an error. Our whole simulation is replicated once, forming two teams of MPI ranks that share their task results. Thus, ideally each team handles only around half of the workload. If a task yields large error criteria values, i.e. is dubious, we compute the task redundantly and compare the outcomes. Whenever they disagree, the task result with a lower error likeliness is accepted. We obtain a self-healing, resilient algorithm which can compensate silent floating-point errors without a significant performance, I/O or memory footprint penalty. Case studies however suggest that a careful, domain-specific tailoring of the error criteria remains essential.

Citation

Samfass, P., Weinzierl, T., Reinarz, A., & Bader, M. (2021). Doubt and Redundancy Kill Soft Errors---Towards Detection and Correction of Silent Data Corruption in Task-based Numerical Software. . https://doi.org/10.1109/ftxs54580.2021.00005

Conference Name Supercomputing 21 - FTXS Workshop - 2021 IEEE/ACM 11th Workshop on Fault Tolerance for HPC at eXtreme Scale (FTXS)
Conference Location St Louis, MO
Start Date Nov 14, 2021
End Date Nov 19, 2021
Acceptance Date Oct 4, 2021
Publication Date 2021-12
Deposit Date Oct 5, 2021
Publicly Available Date Nov 3, 2022
Publisher Institute of Electrical and Electronics Engineers
Pages 1-10
DOI https://doi.org/10.1109/ftxs54580.2021.00005
Additional Information 14-19 Nov. 2021

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Accepted Conference Proceeding (806 Kb)
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