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This paper proposes and evaluates a new approach to directorybased cache coherence protocols called Reactive NUMA (R-NUMA). An R-NUh4A system combines a conventional CC-NUMA coherence protocol with a more-recent Simple-COMA (S-COMA) protocol. What makes R-NUMA novel is the way it dynamically reacts to program and system behavior to switch between CC-NUMA and S-COMA and exploit the best aspects of both protocols. This reactive behavior allows each node in an R-NUMA system to independently choosedoi:10.1145/264107.264205 dblp:conf/isca/FalsafiW97 fatcat:xdrodc2f6rhgbpr7shsx5ookk4