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Heavy tails in queueing systems: impact of parallelism on tail performance. (English) Zbl 1262.68024

Summary: We quantify the efficiency of parallelism in systems that are prone to failures and exhibit power law processing delays. We characterize the performance of two prototype schemes of parallelism, ‘redundant’ and ‘split’, in terms of both the power law exponent and exact asymptotics of the delay distribution tail. We also develop the optimal splitting scheme which ensures that split always outperforms redundant.

MSC:

68M20 Performance evaluation, queueing, and scheduling in the context of computer systems
60G99 Stochastic processes
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References:

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