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Clock synchronisation in a distributed processing system

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TLDR
In this article, a method for clock synchronisation in a distributed processing system comprising the steps of diffusing from a processor with a preferred clock value (for instance, a processor having a fastest correct clock) a synch signal indicating the preferred clock values to the other processors in the system is presented.
Abstract
The present invention provides a method for clock synchronisation in a distributed processing system comprising the steps of. - diffusing from a processor with a preferred clock value (for instance, a processor having a fastest correct clock) a synch signal indicating the preferred clock value to the other processors in the system; and - adjusting at the other processors in the system the local clocks in response to the synch signal such that the difference between the local clock values for each pair of processors in the system is bounded.

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Citations
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Decentralised fault-tolerant clock pulse generation in VLSI chips

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References
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Patent

Method and apparatus for synchronizing the timing subsystems of the physical modules of a local area network

TL;DR: In this paper, the authors present a distributed local area network (DLA) with two timing subsystems (48) of the modules (12) of a DLA to a desired degree of accuracy, each of which produces a fine timing, a synchronization and a real time timing signal.
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Decentralized synchronization of clocks

TL;DR: In this paper, the authors propose a method for resynchronizing clocks in a distributed computing system in the presence of faults, where the condition to be renewed guarantees that all clocks of correct processors never deviate by more than some maximum amount.