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The complexity of verifying memory coherence and consistency

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3 Author(s)
Cantin, J.F. ; Dept. of Electr. & Comput. Eng., Wisconsin-Madison Univ., Madison, WI, USA ; Lipasti, M.H. ; Smith, J.E.

The problem of testing shared memories for memory coherence and consistency is studied. First, it is proved that detecting violations of coherence in an execution is NP-complete, and it remains NP-complete for a number of restricted instances. This result leads to a proof that all known consistency models are NP-hard to verify. The complexity of verifying consistency models is not a mere consequence of coherence, and verifying sequential consistency remains NP-complete even after coherence has been verified.

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Parallel and Distributed Systems, IEEE Transactions on  (Volume:16 ,  Issue: 7 )