--mersenne=bydivisor testers and sessions integrated and converted to structs.

PerfectNumbers.Core/EnvironmentConfiguration.cs

@@ -0,0 +1,31 @@
+using System.Numerics;
+using System.Runtime.CompilerServices;
+using PerfectNumbers.Core.Gpu;
+
+namespace PerfectNumbers.Core;
+
+#pragma warning disable CA2211 // The fields are settable on purpose for the best performance
+
+public static class EnvironmentConfiguration
+{
+	public static ulong DivisorLimit = ulong.MaxValue;
+	public static int GpuBatchSize = GpuConstants.ScanBatchSize;
+	public static int GpuRatio = PerfectNumberConstants.GpuRatio;
+	public static BigInteger MinK = BigInteger.One;
+	public static ComputationDevice OrderDevice = ComputationDevice.Cpu;
+	public static int RollingAccelerators = PerfectNumberConstants.RollingAccelerators;
+	public static string? StateFilePath;
+	public static bool UseGpuOrder;
+	public static bool UseHybridOrder;
+	public static bool UseCpuOrder;
+
+	[MethodImpl(MethodImplOptions.AggressiveInlining | MethodImplOptions.AggressiveOptimization)]
+	public static void Initialize()
+	{
+		UseGpuOrder = OrderDevice == ComputationDevice.Gpu;
+		UseHybridOrder = OrderDevice == ComputationDevice.Hybrid;
+		UseCpuOrder = OrderDevice == ComputationDevice.Cpu;
+	}
+}
+
+#pragma warning restore CA2211 // Non-constant fields should not be visible