removed boxing allocations inside FSM (#6183) (#6196)

The `object.Equals` call here generated hundreds of mb in boxing allocations inside RemotePingPong - using the `EqualityComparer<TState>.Default.Equals` eliminates them. (cherry picked from commit 183ec5a) Co-authored-by: Aaron Stannard <[email protected]>
akkadotnet · Oct 17, 2022 · c78cec6 · c78cec6
1 parent 65f392a
commit c78cec6
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/src/core/Akka/Actor/FSM.cs b/src/core/Akka/Actor/FSM.cs
@@ -1262,12 +1262,14 @@ private void MakeTransition(State<TState, TData> nextState)
                 {
                     Sender.Tell(nextState.Replies[i]);
                 }
-                if (!_currentState.StateName.Equals(nextState.StateName) || nextState.Notifies)
+
+                // avoid boxing
+                if (!EqualityComparer<TState>.Default.Equals(_currentState.StateName, nextState.StateName) || nextState.Notifies)
                 {
                     _nextState = nextState;
                     HandleTransition(_currentState.StateName, nextState.StateName);
                     Listeners.Gossip(new Transition<TState>(Self, _currentState.StateName, nextState.StateName));
-                    _nextState = default(State<TState, TData>);
+                    _nextState = default;
                 }
                 _currentState = nextState;