Modeling and Analysis of Upload Utilization in BitTorrent System

Abstract

Abstract. Upload utilization is one of the most significant performance metrics in BitTorrent system, whereas there has been no accurate model which is suitable for it yet. For this reason, the delicate relation between some key parameters (maximum concurrent uploads, upload bandwidth, TFT round etc.) in BitTorrent is investigated, furthermore the piece diffusion model and the upload utilization model are proposed. Based on these models, we explore the effect of TFT round for the first time and find that the magnitude of TFT round has a significant influence on the transient stage as well as the end stage. Additionally, we show that when the seed's upload bandwidth is fully utilized, to achieve optimal performance, each peer's upload bandwidth should be proportional to its maximum concurrent uploads, and the file size should be large enough compared with the swarm size.

LR2: Improving Push-Based Live Streaming and File Sharing in Peer-to-Peer Network

“…A typical P2P file sharing process can be decomposed to three phases: initial phase, steady phase and finishing phase [22]. Generally, the research on live streaming and file sharing mainly focuses on the first two phases, since the steady phase is assumed to be relatively long [23] [24].…”