A Distributed Node Clock Calibration Method for Distributed Real-time System

Abstract

The invention relates to a distributed node clock calibration method of a distributed real-time system. According to the method, based on two or more similarity distributed bus systems in the distributed system, each distributed system has its own network bus, a plurality of computers are regarded as network nodes and hung on the network bus, each node has an autonomous local clock, each network has a main node for providing a global clock, and the clocks of the main nodes of the global clocks of the distributed networks in a distributed redundant system are synchronous and consistent. The method is characterized in that a distributed node computer adjusts the local clock by receiving the global clocks according to calculation of the skewing of the local clocks so that the local clocks and the global clocks are in the allowed clock skewing, and the clocks of the nodes of the whole distributed redundant system are coordinated and consistent. According to the method, the consistency of all the node computers and the global clocks can be guaranteed in the distributed real-time system, and the coordinated and consistent clock reference can be provided for task scheduling of each distributed node computer.

Description

technical field [0001] The invention belongs to computer technology and relates to a method for calibrating distributed node clocks of a distributed real-time system. Background technique [0002] In a traditional distributed real-time system, each node has its own local clock, but there is no unified global clock. The local clock of each node is used as the scheduling benchmark of node tasks according to its own cycle, and the task execution of each node cannot be coordinated. If the task deployment of the entire distributed system is to be carried out, the task execution of the entire system must be guaranteed by increasing the data update rate of the distributed network bus and each node with the most intensive task execution cycle. Contents of the invention [0003] The purpose of the present invention is: in the distributed real-time system, through the clock calibration of the distributed nodes, it is ensured that all node computers are consistent with the global clo...

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Problems solved by technology

[0002] In a traditional distributed real-time system, each node has its own local clock, but there is no unified global clock. The local clock of each node is used as the scheduling benchmark of node tasks according to its own cycle, and the task execution of each node cannot be coordinated.

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