多集群实时系统中时钟同步的可组合算法

A. Hanzlik, A. Ademaj
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引用次数: 1

摘要

在之前的工作中,我们已经证明,通过在实时系统的每个集群中部署一个具有高质量振荡器(速率主节点)的节点,我们可以通过时钟状态同步的分布式机制与时钟速率同步的中心机制相结合来集成内部和外部时钟同步。通过硬件和仿真实验,我们证明了这种组合提高了单集群和多集群系统中全局时基的精度,同时减少了对非速率主节点的高质量振荡器的需求。在最初的方法中,包括速率主节点在内的所有节点都执行一个容错的内部时钟同步算法,在这个算法中,所有节点都通过时钟状态校正来周期性地调整本地时钟。本文分析了原算法的导数,其中速率主节点不参与内部时钟同步算法。我们从时钟同步的簇精度、簇漂移率、不干扰外部时钟同步和多簇时钟同步等方面对这种时钟同步方法进行了研究和讨论
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Composable Algorithm for Clock Synchronization in Multi-Cluster Real-Time Systems
In a previous work we have shown that by deploying a node with a high-quality oscillator (rate-master node) in each cluster of a real-time system, we can integrate internal and external clock synchronization by a combination of a distributed mechanism for clock state synchronization with a central mechanism for clock rate synchronization. By means of hardware and simulation experiments we have shown that this combination improves the precision of the global time base in single- and multi-cluster systems while reducing the need for high-quality oscillators for non-rate-master nodes. In the original approach all nodes, including the rate-master node, execute a fault-tolerant internal clock synchronization algorithm in course of which all nodes periodically adjust their local clocks by means of clock state correction. In this paper we analyze a derivative of the original algorithm in which the rate-master node does not take part in the internal clock synchronization algorithm. We study and discuss this approach for clock synchronization with regard to cluster precision, cluster drift rate and non-interference with external clock synchronization and multi-cluster clock synchronization
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