Token coherence: a new framework for shared-memory multiprocessors

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 cohe...

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Bibliographic Details
Published in:IEEE MICRO 2003-11, Vol.23 (6), p.108-116
Main Authors: Martin, M.M.K., Hill, M.D., Wood, D.A.
Format: Article
Language:English
Subjects:
Bandwidth
Blocking
Broadcasting
Coherence
Computer architecture
Computer memory
Costs
Counting
Invariants
Logic
Microprocessors
Multiprocessing
Multiprocessor
Protocols
Pushing
Read-write memory
Sun
Switches
Trends
Workload
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Summary: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.
ISSN:0272-1732
1937-4143
DOI:10.1109/MM.2003.1261394