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We consider the GI/G/1 queue described by either the workload U(t) (unfinished work) or the number of customers N(t) in the system. We compute the mean time until U(t) reaches excess of the level K, and also the mean time until N(t) reaches N0. For the M/G/1 and GI/M/1 models, we obtain exact contour integral representations for these mean first passage times. We then compute the mean times asymptotically, as K and N0→∞, by evaluating these contour integrals. For the general GI/G/1 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 K and N0

journal of applied mathematics and stochastic analysis

Mean time for the development of large workloads and large queue lengths in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="${{{{GI} \mathord{\left/ {\vphantom {{GI} G}} \right. \kern-\nulldelimiterspace} G}} \mathord{\left/ {\vphantom {{{{GI} \mathord{\left/ {\vphantom {{GI} G}} \right. \kern-\nulldelimiterspace} G}} 1}} \right. \kern-\nulldelimiterspace} 1}$"><mml:mrow><mml:mrow><mml:mrow><mml:mrow><mml:mrow><mml:mi>G</mml:mi><mml:mi>I</mml:mi></mml:mrow><mml:mo>/</mml:…

Mean time for the development of large workloads and large queue lengths in the GI/