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针对当前对等网中超节点的选择大都根据节点物理性能而没有考虑free-riding现象,综合考虑节点的物理性能、自愿性与对节点的未来预期,提出一种具有激励效用的超节点选取机制SSMI,SSMI中选取节点整体效用值最大的节点作为超节点,超节点同时承担一定的监察作用以威慑Free-riding节点.仿真实验表明,SSMI较之按节点能力选择的方法使P2P系统性能明显提高,能保证在较小的网络开销下,达到激励节点主动参与贡献资源的目的,提高了文件共享数量与查询成功率,减少了资源的定位开销.同时保障了超节点叠加网络的稳定性,具有较好的系统鲁棒性.
According to the physical performance of nodes, the choice of super-nodes in the current peer-to-peer network mostly does not consider the free-riding phenomenon. Considering the physical properties of the nodes and the future expectation of the nodes, this paper proposes a super node selection mechanism SSMI , SSMI selects the node with the largest overall utility value as the super node, and the super node also assumes some supervisory role to deter Free-riding node.Experimental results show that the performance of P2P system is significantly improved by SSMI compared with the method of node capability selection, It can ensure that the motivation node actively participates in the contribution of resources with a small network overhead, improves the number of file sharing and query success rate, reduces the resource positioning overhead, and at the same time guarantees the stability of the super node overlay network, Good system robustness.