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在作者提出的一种新的Web集群体系结构的基础上,详细讨论了防止系统过载,实现区分服务的多级控制策略与机制.给出了区分服务接纳控制的系统模型及其数学描述,然后提出了基于事务的区分服务接纳控制策略.实验结果与理论分析表明在系统过载时能有效保证系统的稳定性,高优先级任务得到较好的服务,在某些情况下比基于会话的接纳控制效率好10%.
On the basis of a new architecture of Web cluster proposed by the author, the multi-level control strategy and mechanism to prevent system overload and realize differentiated services are discussed in detail.The system model of distinguishing service admission control and its mathematical description are given, and then This paper proposes a transaction-based differentiated service admission control strategy.Experimental results and theoretical analysis show that the system stability is effectively guaranteed during system overload, that high-priority tasks are better served, and in some cases than session-based admission control 10% efficiency.