Abstract
Peer-to-peer file-sharing protocols, such as BitTorrent, have been widely used to improve the performance and scalability of file distribution systems. In this paper, we study the performance of peer-assisted file distribution systems with heterogeneous peers. Based on a measurement study of BitTorrent on PlanetLab, we made two key observations: (i) there is a fixed pattern in the utilization of the available bandwidth over the course of a download, and (ii) peers enjoy an amount of service that is commensurate with their contribution. Building on these insights, we developed an analytical model to estimate the download time for each class of peers in a well-provisioned peer-assisted file distribution system based on BitTorrent. Our model accurately predicts the download time and achieves an average error rate of 16.5% for heterogeneous swarms up to 150 nodes in size. We demonstrate how it can be used to estimate the server capacity for achieving a specific quality of service in a large heterogeneous swarm.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
