International Business Machines Corporation

Chunggeon Rhee

Gregory William Alexander

Craig Raymond Walters

Timothy Carl Bronson

Ram Sai Manoj Bamdhamravuri

Anna Mozeshtam

Embodiments include processing commands on multiprocessor chip having a plurality of nodes that are interconnected via a clockwise ring network and a counterclockwise ring network. Aspects include receiving, by a first ring station associated with a first node of the plurality of nodes, the command for execution and transmitting, by the first ring station via one or more of the clockwise ring network and the counterclockwise ring network, the command for execution. Aspects also include receiving, by a second ring station associated with a second node of the plurality of nodes, the command for execution, wherein the second ring station is connected to a third ring station associated with a third node of the plurality of nodes via a first cross bar of the one or more cross bars and transmitting, by the second ring station to the third ring station via the first cross bar, the command for execution.

Bidirectional ring-based interconnection networks having a cross bar for multiprocessors

Aspects of the invention include computer-implemented methods, systems, and computer program products that access a multi-copy scope directory state of a cache memory that indicates a scope of sharing of a cache line in a cache memory system and determine a scope of sharing of the cache line in the cache memory system based on the multi-copy scope directory state, where the multi-copy scope directory state enumerates a plurality of scopes within the cache memory system. The scope of sharing is used to reduce a number of queries to one or more cache memories having a larger scope than a shared scope identified in the scope of sharing. The multi-copy scope directory state of the cache memory is updated based on detecting a change in shared scope of the cache line within the cache memory system.

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Poughkeepsie, NY, United States of America

Chunggeon Rhee