On Cooperative Content Distribution and the Price of Barter
ICDCS '05 Proceedings of the 25th IEEE International Conference on Distributed Computing Systems
Measurements, analysis, and modeling of BitTorrent-like systems
IMC '05 Proceedings of the 5th ACM SIGCOMM conference on Internet Measurement
Stochastic analysis of file-swarming systems
Performance Evaluation
Providing statistically guaranteed streaming quality for peer-to-peer live streaming
Proceedings of the 18th international workshop on Network and operating systems support for digital audio and video
Peer-assisted content distribution with prices
CoNEXT '08 Proceedings of the 2008 ACM CoNEXT Conference
The design trade-offs of BitTorrent-like file sharing protocols
IEEE/ACM Transactions on Networking (TON)
Multimedia Tools and Applications
Multimedia Tools and Applications
On the performance and fairness of BitTorrent-like data swarming systems with NAT devices
Computer Networks: The International Journal of Computer and Telecommunications Networking
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In this paper, we examine the factors that contribute to the variability in download time of a self-organizing P2P file distribution application such as BitTorrent. We conducted a series of side-by-side live experiments, involving two clients running on the same machine downloading the same file at the same time. We found that the download latency varied significantly, sometimes by a factor of 2. Surprisingly, the main contributing factor isn't the network bandwidths of the set of neighbors that a client is given. Rather, it has to do with the frequency of turn-overs in "close" neighbors, i.e. those that are in a stable data-exchange relationship with the client. Analysis of the log data shows that a client obtains over 90% of the file from a small set of close neighbors, and if a close neighbor leaves the network, it takes the client a long time, over half an hour, to find another one. This suggests that self-organizing P2P file distributions indeed need external help in order to provide QoS guarantees, but such guarantees are achievable with proper enhancements to the P2P network.