SIGMETRICS '05 Proceedings of the 2005 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
Content availability and bundling in swarming systems
Proceedings of the 5th international conference on Emerging networking experiments and technologies
On the stability and optimality of universal swarms
Proceedings of the ACM SIGMETRICS joint international conference on Measurement and modeling of computer systems
How prevalent is content bundling in BitTorrent
Proceedings of the ACM SIGMETRICS joint international conference on Measurement and modeling of computer systems
On the stability of two-chunk file-sharing systems
Queueing Systems: Theory and Applications
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Hajek and Zhu recently showed that the BitTorrent protocol can become unstable when peers depart immediately after downloading all pieces of a file. In light of this result, Zhou et al. propose bundling swarms together, allowing peers to exchange pieces across different swarms, and claim that such "universal swarms" can increase BitTorrent's stability region. In this work, we formally characterize the stability region of universal swarms and show that they indeed exhibit excellent stability properties. In particular, bundling allows a single seed with limited upload capacity to serve an arbitrary number of disjoint swarms if the arrival rate of peers in each swarm is lower than the seed upload capacity. Our result also shows that the stability region is insensitive to peers' upload capacity, piece selection policies and number of swarms.