Abstract:

A model and performance analysis of BitTorrent(BT)-like P2P system was presented. The peer behavior in this system was analyzed in detail. A peer model, seed model, file fragment model, interesting and choking model and peer selection model were built while considering the effects of file fragment on this system. The probability of a peer interested in neighbor peer at BT sub-system, the probability of a peer being choked by neighbor peer, and the probability of uploading peer being selected were analyzed. By this model, the relation between the generant probability of a peer uploading behavior and the whole peer number at BT sub-system was studied. The data result showed that the generant probability of a peer uploading behavior decreased as the whole peer number at BT sub-system increased.

Key words: BitTorrent, file fragment, choke