A Queueing System for Modeling a File Sharing Principle
Abstract
We investigate in this paper the performance of a simple file sharing principle. For this purpose, we consider a system composed of N peers becoming active at exponential random times; the system is initiated with only one server offering the desired file and the other peers after becoming active try to download it. Once the file has been downloaded by a peer, this one immediately becomes a server. To investigate the transient behavior of this file sharing system, we study the instant when the system shifts from a congested state where all servers available are saturated by incoming demands to a state where a growing number of servers are idle. In spite of its apparent simplicity, this queueing model (with a random number of servers) turns out to be quite difficult to analyze. A formulation in terms of an urn and ball model is proposed and corresponding scaling results are derived. These asymptotic results are then compared against simulations.
Cite
@article{arxiv.0803.1610,
title = {A Queueing System for Modeling a File Sharing Principle},
author = {Florian Simatos and Philippe Robert and Fabrice Guillemin},
journal= {arXiv preprint arXiv:0803.1610},
year = {2008}
}