Big jobs arrive early: From critical queues to random graphs

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We consider a queue to which only a finite pool of n customers can arrive, at times depending on their service requirement. A customer with stochastic service requirement S arrives to the queue after an exponentially distributed time with mean S for some α ∈ [0,1]; therefore, larger service requirements trigger customers to join earlier. This finite-pool queue interpolates between two previously studied cases: α = 0 gives the so-called Δ(i) /G/1 queue and α = 1 is closely related to the exploration process for inho-mogeneous random graphs. We consider the asymptotic regime in which the pool size n grows to infinity and establish that the scaled queue-length process converges to a diffusion process with a negative quadratic drift. We leverage this asymptotic result to characterize the head start that is needed to create a long period of activity. We also describe how this first busy period of the queue gives rise to a critically connected random forest.

Original languageEnglish
Pages (from-to)310-334
Number of pages25
JournalStochastic Systems
Issue number4
Publication statusPublished - Dec 2020


  • Directed random graphs
  • Heavy-traffic approximation
  • Queueing theory
  • Transitory queueing systems


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