Pools renamed to FixedCapacityPools. Other fixed capacity collections added. Queues, concurrent queues and standard stacks replaced with fixed capacity stacks. MethodImplOptions.AggressiveInlining and .AggressiveOptimization added to simple methods and getters / setters. Variables optimized in few places.

PerfectNumbers.Core/FixedCapacityPools.cs

@@ -0,0 +1,37 @@
+using System.Runtime.CompilerServices;
+
+namespace PerfectNumbers.Core
+{
+	public static class FixedCapacityPools<T>
+	{
+		[ThreadStatic]
+		private static FixedCapacityArrayPool<T>? _arrayPool;
+		internal static FixedCapacityArrayPool<T> ExclusiveArray
+		{
+
+			[MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
+			get => _arrayPool ??= new(PerfectNumberConstants.DefaultPoolCapacity);
+		}
+	}
+
+	public static class FixedCapacityPools
+	{
+		[ThreadStatic]
+		private static IntArrayPool? _intArrayPool;
+		internal static IntArrayPool ExclusiveIntArray
+		{
+
+			[MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
+			get => _intArrayPool ??= new(PerfectNumberConstants.DefaultPoolCapacity);
+		}
+
+		[ThreadStatic]
+		private static UlongArrayPool? _ulongArrayPool;
+		internal static UlongArrayPool ExclusiveUlongArray
+		{
+
+			[MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
+			get => _ulongArrayPool ??= new(PerfectNumberConstants.DefaultPoolCapacity);
+		}
+	}
+}