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No more crash or crunch: sustainable credit dynamics in a P2P community

Rahman, R.; Hales, D.; Vinkó, T.; Pouwelse, J. and Sips, H. (2010). No more crash or crunch: sustainable credit dynamics in a P2P community. In: 2010 International Conference on High Performance Computing and Simulation (HPCS 2010), 28 Jun - 2 Jul 2010, Caen, Normandy, France.

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Many peer-to-peer file sharing communities implement credit policies to incentivise users to contribute upload resources. Such policies implicitly assume a user model - how the user controlling each peer behaves. We show using an agent-based model that credit policies, based on bandwidth contribution, and a selfish user model, can lead to both “crunches” and “crashes” where the system seizes completely due to too little credit or too much credit. We explore the conditions that lead to these system pathologies and present a theoretical analysis that allows us to determine if a community is sustainable or will eventually crunch or crash. Finally we apply the analysis to produce a novel adaptive credit system that automatically adjusts credit policies to maintain sustainability.

Item Type: Conference or Workshop Item
Copyright Holders: 2010 IEEE
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetFuture and Emerging Technologies programme FP7-COSI-ICT of the European Commission through project QLectives (grant no.: 231200)
Extra Information: Conference held in conjunction with the 6th International Wireless Communications and Mobile Computing Conference (IWCMC )
Keywords: P2P; economics; agent-based simulation; credits; incentives
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 32891
Depositing User: David Hales
Date Deposited: 07 Mar 2012 16:55
Last Modified: 08 Dec 2018 18:18
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