On the maximum queue length in the supermarket model
Abstract
There are $n$ queues, each with a single server. Customers arrive in a Poisson process at rate $\lambda n$, where $0<\lambda<1$. Upon arrival each customer selects $d\geq2$ servers uniformly at random, and joins the queue at a least-loaded server among those chosen. Service times are independent exponentially distributed random variables with mean 1. We show that the system is rapidly mixing, and then investigate the maximum length of a queue in the equilibrium distribution. We prove that with probability tending to 1 as $n\to\infty$ the maximum queue length takes at most two values, which are $\ln\ln n/\ln d+O(1)$.
- Publication:
-
arXiv Mathematics e-prints
- Pub Date:
- May 2006
- DOI:
- 10.48550/arXiv.math/0605639
- arXiv:
- arXiv:math/0605639
- Bibcode:
- 2006math......5639L
- Keywords:
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- Mathematics - Probability;
- 60C05 (Primary) 68R05;
- 90B22;
- 60K25;
- 60K30;
- 68M20 (Secondary)
- E-Print:
- Published at http://dx.doi.org/10.1214/00911790500000710 in the Annals of Probability (http://www.imstat.org/aop/) by the Institute of Mathematical Statistics (http://www.imstat.org)