ch4/ofi: add mr cache for FI_HMEM_MR#7864
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Expose buffer id so MPICH layer can use buffer id to manage caches.
Add function to retrieve buffer id.
The provider (e.g. EFA) may not use cache internally with mr
registration. Without caching, the overhead of mr registration will kill
most performance.
Add MPIDI_OFI_mr_cache facility to cache the mrs in MPICH.
Use the simple array for cache for:
1. simplicity
2. cache size limit and LRU eviction
3. in case we need check for stale cache entries
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Pull Request Description
The provider (e.g. EFA) may not cache internally with mr registration.
Without caching, the overhead of mr registration will hurt performance.
Add MPIDI_OFI_mr_cache facility to cache mrs in MPICH. Use a simple
array-based cache for:
1. simplicity
2. cache size limit and LRU eviction
3. stale cache entry detection (optional)
[skip warnings]
Author Checklist
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