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This paper examines the factors that contribute to the variability in download time of a self-organizing P2P le distribution application such as BitTorrent. This paper conducted a series of side-by-side live experiments, involving two clients running on the same machine downloading the same le at the same time. The authors 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 over in "Close" neighbors, i.e. those that are in a stable data-exchange relationship with the client.
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