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Publications of SPCL
|K. Kharbas, D. Kim, T. Hoefler and F. Mueller:|
|Assessing HPC Failure Detectors for MPI Jobs|
(Vol , Nr. , In Proceedings of the 2012 20th Euromicro International Conference on Parallel, Distributed and Network-based Processing, presented in Munich, Germany, pages 81--88, IEEE Computer Society, ISSN: , ISBN: 978-0-7695-4633-9, Feb. 2012, )
AbstractReliability is one of the challenges faced by exascale computing. Components are poised to fail during large-scale executions given current mean time between failure (MTBF) projections. To cope with failures, resilience methods have been proposed as explicit or transparent tech- niques. For the latter techniques, this paper studies the challenge of fault detection. This work contributes a study on generic fault detection capabilities at the MPI level and beyond. The objective is to assess different detectors, which ultimately may or may not be implemented within the application’s runtime layer. A first approach utilizes a periodic liveness check while a second method promotes sporadic checks upon communication activities. The contributions of this paper are two-fold: (a) We provide generic interposing of MPI applications for fault detection. (b) We experimentally compare periodic and sporadic methods for liveness checking. We show that the sporadic approach, even though it imposes lower bandwidth requirements and utilizes lower frequency checking, results in equal or worse application performance than a periodic liveness test for larger number of nodes. We further show that performing liveness checks in separation from MPI applications results in lower overhead than interpositioning, as demonstrated by our prototypes. Hence, we promote separate periodic fault detection as the superior approach for fault detection.