Hi All,
While implementing the cache coherence protocol for a cc-NUMA system,the
directory structure(e.g.directory entry) can be oganizated in many ways, for
example, full_map bit vector, limited pointers, or multilevel directory the
first level of which is a directory cache.
Theoretically, different directory structures have different impacts on system
performance. How does GEM5 implement directory structures?
e.g.
In file MESI_CMP_directory-dir.sm, the DirectoryEntry is a so-called
AbstractEntry, how can this implementation simulate the true situation?
// DirectoryEntry
structure(Entry, desc="...", interface="AbstractEntry") {
State DirectoryState, desc="Directory state";
DataBlock DataBlk, desc="data for the block";
NetDest Sharers, desc="Sharers for this block";
NetDest Owner, desc="Owner of this block";
}
Sincerely
Lyh
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