同构BitTorrent群中的异构下载时间
Heterogeneous download times in a homogeneous BitTorrent swarm
摘要：
BitTorrent（BT）动态建模和理解是一个经常性的研究课题，主要是由于其高度的复杂性和巨大的实际效率。多年来，不同的模型已经揭示了系统所表现出的各种现象，其中许多直接影响其性能。在本文中，我们确定和表征的现象，以前没有观察到：同质的同行（相对于他们的上传能力）的经验异构的下载速率。这种现象的后果对对等体和系统性能有直接影响，例如下载时间的高度可变性、对等体到达顺序的不公平性、突发离开和内容同步。详细的数据包级模拟和基于原型的实验在互联网上进行了表征这种现象。我们还开发了一个数学模型，准确地预测异构下载速率的同质同行作为其内容的函数。虽然这种现象在不受欢迎的群体（很少的对等体）中更普遍，但这些群体代表了BT中最常见的群体类型。
英文摘要：
Modeling and understanding BitTorrent (BT) dynamics is a recurrent research topic mainly due to its high complexity and tremendous practical efficiency. Over the years, different models have uncovered various phenomena exhibited by the system, many of which have direct impact on its performance. In this paper we identify and characterize a phenomenon that has not been previously observed: homogeneous peers (with respect to their upload capacities) experience heterogeneous download rates. The consequences of this phenomenon have direct impact on peer and system performance, such as high variability of download times, unfairness with respect to peer arrival order, bursty departures and content synchronization. Detailed packet-level simulations and prototype-based experiments on the Internet were performed to characterize this phenomenon. We also develop a mathematical model that accurately predicts the heterogeneous download rates of the homogeneous peers as a function of their content. Although this phenomenon is more prevalent in unpopular swarms (very few peers), these by far represent the most common type of swarm in BT.
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