Intersection algorithm: Difference between revisions

Revision as of 17:14, 11 December 2004

Revision as of 22:34, 22 December 2004

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The '''Intersection Algorithm''' is an [[agreement algorithm]] used to select sources for estimating accurate time from a number of [[noise|noisy]] time sources, it forms part of the modern Network Time Protocol. It is a modified form of [[Marzullo's algorithm]].

While Marzullo's Algorithm will return the smallest interval consistant with the largest number of sources, the returned interval does not necessarily include the center point (calculatdcalculated offset) of all the sources in the intersection. The Intersection Algorithm returns an interval that includes that returned by Marzullo's algorithm but may be larger since it will include the center points. This larger interval allows using additional statistical data to select a point within the interval, reducing the [[jitter]] in repeated execution.