Method for reducing cross-interrogate delays in a multiprocessor

Details Method for reducing cross-interrogate delays in a multiprocessor Method for reducing cross-interrogate delays in a multiprocessor

1988-12-05

1991-05-21

Moffitt, James W.

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364229, 364243, 3642434, 36424341, 3642466, 3642468, 3642523, 3642551, 3642563, 3642592, 3642593, G06F 1200, G06F 1208, G06F 1214

Patent

active

050180630

ABSTRACT:
A Fetch-Then-Confirm (FTC) policy is used for the handling of data fetch upon XIEX's in a tightly coupled multiprocessor environment. The fetch and/or use of a requested data line upon XIEX is allowed before the SCE receives the confirmation of validity (or invalidity) of the requested line through the clearing procedure. Whenever a line having uncertain validity is used by a CP the results of execution of instructions depending on the validity of the line should not be committed to the cache until a confirmation is received from the SCE. When the confirmation from the SCE indicates that a line L is known to be valid, all results depending on the validity of L can be processed as usual. If, however, the SCE indicates that a previously fetched line L having uncertain validity is in fact invalid, all operations performed based on L's contents should be aborted and restarted properly when a valid copy of L is received.

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