Understanding the performance of concurrent error detecting superscalar microarchitectures

Superscalar out-of-order microarchitectures can be modified to support redundant execution of a program as two concurrent threads for soft-error detection. However, the extra workload from redundant execution incurs a performance penalty due to increased contention for resources throughout the datapath. We present four key parameters that affect performance of these designs, namely 1) issue and functional unit bandwidth, 2) issue queue and reorder buffer capacity, 3) decode and retirement bandwidth, and 4) coupling between redundant threads' instantaneous resource requirements. We then survey existing work in concurrent error detecting superscalar microarchitectures and evaluate these proposals with respect to the four factors. © 2005 IEEE.


Published in:
Proceedings of the International Symposium on Signal Processing and Information Technology, 13 - 18
Presented at:
Athens, Greece, December
Year:
2005
Laboratories:




 Record created 2009-04-06, last modified 2018-09-13

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