[Backport] Improve performance of LRU.Add() (#6870) #6872
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LRU is using ConcurrentDictionary to keep elements in memory. The Add method is using ConcurrentDictionary.Count which may create contention if multiple threads are trying to use the object. This change wraps CurrentDictionary in a ConcurrentDictionary-like object providing faster count updated on additions and removals. Plus a few cosmetic changes. # Conflicts: # src/Orleans.Core/Utils/LRU.cs
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LRU is using ConcurrentDictionary to keep elements in memory. The Add method is using ConcurrentDictionary.Count which may create contention if multiple threads are trying to use the object.
This change wraps CurrentDictionary in a ConcurrentDictionary-like object providing faster count updated on additions and removals.
Plus a few cosmetic changes.