Abstract
The P2P-based video-on-demand (P2P VoD) service has achieved tremendous success among Internet users, and attracted many researchers’ interest. Piece selection policy, peer selection policy and replica management policy are three important policies in P2P VoD systems. Although there has been some research work on the policy selection of the P2P VoD system, it still remains unknown that which policy composition is better for the system. Different from the existing research, we study the existing P2P VoD policies by using a simulation framework to understand the features as well as the performance of different policy compositions. The simulation results indicate that when the bandwidth and storage resources are limited in the P2P VoD system, the composition of the sequential piece selection policy, the cascading peer selection policy and the proportional replica management policy has the best performance among all the different policy compositions. However, when the bandwidth and storage resources are sufficient in the system, there will be little difference between different policies. To further understand such a system, we also explore the impact of resources on policies selection. Our simulation provides evidence that theoretically the P2P VoD system can work well without extra replica space as long as the bandwidth of the peers is large enough, but the extra storage space can help improve the performance of the system in practical scenarios where the peers’ bandwidth is limited.
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Notes
It should be noted that these policy choices are the best among those choices we research but not all possible ones.
The code of our simulation is shared at http://code.google.com/p/p2p-vod-simulation/
In fact, network delay may have a mandatory influence in peer connections and the simulation results.
Peers may be in the process of watching video at the beginning of simulation, so the start piece could not be 0.
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Acknowledgments
This work has been supported in part by NSFC Projects (61170292, 61272446), National Science and Technology Major Project (2012ZX03005001), 973 Project of China (2009CB320501 and 2012CB315803) and National Key Technology R&D Program (2011BAK08B05-02).
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Xu, K., Liu, X., Ma, Z. et al. Exploring the policy selection of the P2P VoD system: A simulation-based research. Peer-to-Peer Netw. Appl. 8, 459–473 (2015). https://doi.org/10.1007/s12083-014-0268-0
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DOI: https://doi.org/10.1007/s12083-014-0268-0