Method and apparatus for clock management

Details Method and apparatus for clock management Method and apparatus for clock management

1986-03-28

1988-05-24

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

370103, 375107, 34082521, 368 47, H04Q 900, H04J 306

Patent

active

047469200

ABSTRACT:
Disclosed is a method, and apparatus implementing that method, for synchronizing and managing the "system clocks" maintained by each of a number of processor units forming a multiprocessor system. Based on an averaging technique, the method includes creating a synchronization message by an originator processor unit and routing that message to other of the processor units to obtain clock values representative of each of the system clocks of each processor unit. The average clock value is then determined and that average clock value then rerouted to each of the processor units to permit them to update, if necessary, their individual system clocks to the average of all. The method further includes determining the transit times encountered by the various messages so that each processor unit can adjust the average clock value it will use to update or synchronize its system clock to account for such transit times.

REFERENCES:
patent: 3751900 (1973-08-01), Philips
patent: 4142069 (1979-02-01), Stover
patent: 4144414 (1979-03-01), Nicholas
patent: 4228496 (1980-10-01), Katzman et al.
patent: 4253181 (1981-02-01), Watten
patent: 4494211 (1985-01-01), Schwartz

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