Research On Data Distribution Algorithm And The Cache Algorithm In P2P Streaming Media

With the multimedia technology and Internet technology mature,streaming media has become the interconnect one of the very important applications.However, with the number of users increasing, user demand to inprove,Traditional streaming media system can not be good to meet the needs of users.In recent years, P2P technology and the rise of a wide range of applications, to stream into the blood of newborn. Based on analyzing and summarizing system architecture and the application characteristics of the existing P2P streaming media system,this paper studies the optimization of the performance of the P2P on-demand streaming media system.Firstly, for the existing distribution system model in resource utilization is generally low and streaming media applications in large-scale effects of poor, Therefore,this article proposes the Gossip protocol-based distribution system plan. Overlay is set up by Gossip protocol, using super nodes to manage the common node on the other, full advantage of the super nodes and ordinary nodes resources. Simulation results show that the program control information on the cost of the transmission overhead on the smaller number of more. Therefore the program on large-scale streaming media service system has a good reference.Secondly, through the existing data allocation algorithms and found that existing data allocation algorithm in the actual performance under heterogeneous network instability, especially when the network environment changes and the allocation algorithm has been unable to make the corresponding adjustment.On this basis, this paper can adapt to network changes of dynamic data allocation algorithm for GD, the algorithm can change based network environment, transmission bandwidth, such as the situation changes and node failure to make appropriate adjustments. Simulation shows that the scheme has a lower time delay.Finally,the paper studies the existing caching management penetratingly. Streaming media applications from the cache management requirements, such as buffer space usage of the two advantages of cache management mechanism and management system for existing cache cache replacement policy, the paper proposes the minimum value based on the cache replacement algorithm for SDU. Simulation results show that the algorithm in reducing the time delay and reduce the server load has a very good performance.