Mean time for the development of large workloads and large queue lengths in the queue
Received01 Jul 1995
Revised01 Oct 1995
We consider the queue described by either the workload (unfinished work) or the number of customers in the system. We compute the mean time until reaches excess of the level , and also the mean time until reaches . For the and models, we obtain exact contour integral representations for these mean first passage times. We then compute the mean times asymptotically, as and , by evaluating these contour integrals. For the general model, we obtain asymptotic results by a singular perturbation analysis of the appropriate backward Kolmogorov equation(s). Numerical comparisons show that the asymptotic formulas are very accurate even for moderate values of and .
Copyright © 1996 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.