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Single-Threaded Mode AVF Prediction During Redundant Execution

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Executive Summary

Transient faults can lead to serious errors in execution. Providing protection for the processor core against these faults requires redundant execution, which leads to a performance loss. However, not all bit flips have equal impact on the processor. The Architectural Vulnerability Factor (AVF) quantifies when a soft error is likely to alter the final output and when it has little impact due to the effects of masking. Thus, redundancy is only important during periods of high AVF. Although calculating the AVF typically requires post-execution analysis of the microarchitectural behavior of a program, recent work has shown it can be estimated online.

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