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lazyplus

Question:

Although the cache is relatively small in one node, there is a chance that nodes will access to the memory in other nodes.

Assume there are 1024 nodes each with 1MB cache, it's possible (of course very rare) that all nodes access to part of node 0's memory. Thus, the total cache size could be as large as 1024 * 1MB = 1GB. How should we handle this potential large cache with sparse directory?