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Assessing the impact of partial verifications against silent data corruptions

Abstract : Silent errors, or silent data corruptions, constitute a major threat on very large scale platforms. When a silent error strikes, it is not detected immediately but only after some delay, which prevents the use of pure periodic check pointing approaches devised for fail-stop errors. Instead, check pointing must be coupled with some verification mechanism to guarantee that corrupted data will never be written into the checkpoint file. Such a guaranteed verification mechanism typically incurs a high cost. In this paper, we assess the impact of using partial verification mechanisms in addition to a guaranteed verification. The main objective is to investigate to which extent it is worthwhile to use some light cost but less accurate verifications in the middle of a periodic computing pattern, which ends with a guaranteed verification right before each checkpoint. Introducing partial verifications dramatically complicates the analysis, but we are able to analytically determine the optimal computing pattern (up to the first-order approximation), including the optimal length of the pattern, the optimal number of partial verifications, as well as their optimal positions inside the pattern. Performance evaluations based on a wide range of parameters confirm the benefit of using partial verifications under certain scenarios, when compared to the baseline algorithm that uses only guaranteed verifications.
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Submitted on : Sunday, January 10, 2016 - 6:27:11 PM
Last modification on : Wednesday, November 20, 2019 - 2:35:53 AM

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Aurélien Cavelan, Saurabh Raina, Yves Robert, Hongyang Sun. Assessing the impact of partial verifications against silent data corruptions. ICPP'2015, The Int. Conference on Parallel Processing, ICPP, 2015, Beijing, China. pp.440-449 ⟨10.1109/ICPP.2015.53⟩. ⟨hal-01253493⟩



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