DVE系统中基于延迟拟合的间距一致性控制方法

An Interval Consistency Control Method Based on Estimating the Network Delay in the DVE Systems

分布式虚拟环境系统中连续模型的间距一致性问题是影响系统功能和性能的关键问题,现有控制方法通常采用发送节点确定延迟的策略,在接收节点之间建立了制约关系,无法对系统的响应能力进行有效优化。为此,本文提出基于延迟拟合的间距一致性控制方法,该方法通过接收节点定序的方式解除了节点间的强制约关系,并通过本地事件和异地事件统一延迟的策略维护了事件处理的时序一致和间距一致。此外,为了在运行期对节点延迟时间进行有效调配,本文提出一种基于二叉搜索树的延迟拟合值维护方法,通过周期性地对节点间延迟进行拟合及更新,保证了该方法的有效性。实验结果表明本文方法在保证各节点间距一致性的基础上有效改善了系统的整体性能。

The interval consistency problem of continuous models is the key issue to determine system functionality and effectiveness in the DVE systems. The existing methods often utilize the strategy that the sender nodes are responsible for choosing the event delay, and impose a restriction relationship on the all receiver nodes, which hampers the process to optimize the system responsiveness. In this paper, we propose a novel interval consistency control method based on estimating the network delay. The method utilizes the strategy that the receiver nodes are responsible for choosing the event delay to relieve the restriction relationship among all the receiver nodes. Moreover, the time stamp consistency and interval consistency are kept simultaneously due to the same delay strategy for all local events and remote events. For adjusting the parameters properly during the run time, we propose a B-tree based the network delay estimation method, which adjusts the delay parameter periodically and ensure the effectiveness of our method. The experimental results show that our method can provide interval consistency for all the nodes and improve the overall system performance effectively.