Large deviations without principle: join the shortest queue

Ad Ridder () and Adam Shwartz ()

Mathematical Methods of Operations Research, 2005, vol. 62, issue 3, 467-483

Abstract: We develop a methodology for studying “large deviations type” questions. Our approach does not require that the large deviations principle holds, and is thus applicable to a large class of systems. We study a system of queues with exponential servers, which share an arrival stream. Arrivals are routed to the (weighted) shortest queue. It is not known whether the large deviations principle holds for this system. Using the tools developed here we derive large deviations type estimates for the most likely behavior, the most likely path to overflow and the probability of overflow. The analysis applies to any finite number of queues. We show via a counterexample that this system may exhibit unexpected behavior Copyright Springer-Verlag 2005

Date: 2005
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DOI: 10.1007/s00186-005-0037-1

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