Off-line clock synchronization for multiprocessor event traces

Details Off-line clock synchronization for multiprocessor event traces Off-line clock synchronization for multiprocessor event traces

1997-02-06

1999-04-20

Meky, Moustafa M.

3951821, G06F 104

Patent

active

058965246

ABSTRACT:
Local clock data is collected at run time in a multiprocessor system. Postprocessing is used to determine a global time base from the local clock readings. Clock drift and offset parameters are calculated for the local clocks. These parameters are used to adjust the time stamps of events in a global event log in order to create a global time base. A first method is used to calculate clock drift and offset parameters between processors with too or more event pairs oriented in the same direction. A second method is used to calculate clock drift and offset parameters between processors with event pairs oriented in opposite directions. A third method is used where the processors have no event pairs between them.

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