Question: Since we can reduce the overhead of directory storage by using limited pointer schemes/sparse directory schemes, it seems that directory based coherence schemes outperform snooping schemes (i.e. in terms of scalability, communication between processors, etc.) with few disadvantages. Are there any nontrivial situations in which snooping schemes is preferred to directory based schemes?
Question: Since we can reduce the overhead of directory storage by using limited pointer schemes/sparse directory schemes, it seems that directory based coherence schemes outperform snooping schemes (i.e. in terms of scalability, communication between processors, etc.) with few disadvantages. Are there any nontrivial situations in which snooping schemes is preferred to directory based schemes?
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