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Token coherence: a new framework for shared-memory multiprocessors

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3 Author(s)
M. M. K. Martin ; Wisconsin Univ., Madison, WI, USA ; M. D. Hill ; D. A. Wood

Commercial workload and technology trends are pushing existing shared-memory multiprocessor coherence protocols in divergent directions. Token coherence provides a framework for new coherence protocols that can reconcile these opposing trends. The token coherence framework directly enforces the coherence invariant by counting tokens (requiring all of a block's tokens to write and at least one token to read). This token-counting approach enables more obviously correct protocols that do not rely on request ordering and can operate with alternative policies that seek to improve the performance of future multiprocessors.

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IEEE Micro  (Volume:23 ,  Issue: 6 )