MontgomeryDivisorData converted to a pooled class to limit GC pressure. MontgomeryDivisorDataGpu added for GPU operations. PrimeOrderCalculator kernels precompiled during warmup.

EvenPerfectBitScanner.Benchmarks/Pow2ModBenchmarks.cs

@@ -470,7 +470,7 @@ public class Pow2ModBenchmarks
 				Console.WriteLine($"Calculating small cycle {smallModulus}");
                 smallDivisors[i] = CreateMontgomeryDivisorData(smallModulus);
                 smallExponents[i] = NextSmallExponent(random);
-                smallCycles[i] = MersenneDivisorCycles.CalculateCycleLength(smallModulus, MontgomeryDivisorData.FromModulus(smallModulus));
+                smallCycles[i] = MersenneDivisorCycles.CalculateCycleLength(smallModulus, MontgomeryDivisorDataPool.Shared.FromModulus(smallModulus));
 
                 (ulong largeModulus, ulong largeCycle) = NextLargeModulusAndCycle(random);
 				Console.WriteLine($"Calculating large cycle {largeModulus}");
@@ -582,7 +582,7 @@ public class Pow2ModBenchmarks
 
         private static ulong CalculateCycleLengthWithHeuristics(ulong modulus, ref ulong? previousPrimeOrder)
         {
-            MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(modulus);
+            MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(modulus);
             if (modulus <= 1UL || (modulus & 1UL) == 0UL)
             {
                 return MersenneDivisorCycles.CalculateCycleLength(modulus, divisorData);
@@ -651,7 +651,7 @@ public class Pow2ModBenchmarks
 
     private ulong CalculateCycleLengthWithHeuristics(ulong modulus, ulong fallbackOrder = 0UL)
     {
-        MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(modulus);
+        MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(modulus);
         if (modulus <= 1UL || (modulus & 1UL) == 0UL)
         {
             return fallbackOrder != 0UL ? fallbackOrder : MersenneDivisorCycles.CalculateCycleLength(modulus, divisorData);

EvenPerfectBitScanner.Benchmarks/Pow2MontgomeryModBenchmarks.cs

@@ -37,7 +37,7 @@ public class Pow2MontgomeryModBenchmarks
             ulong smallModulus = NextSmallOddModulus();
             _smallDivisors[i] = CreateMontgomeryDivisorData(smallModulus);
             _smallExponents[i] = NextSmallExponent();
-            _smallCycles[i] = MersenneDivisorCycles.CalculateCycleLength(smallModulus, MontgomeryDivisorData.FromModulus(smallModulus));
+            _smallCycles[i] = MersenneDivisorCycles.CalculateCycleLength(smallModulus, MontgomeryDivisorDataPool.Shared.FromModulus(smallModulus));
 
 				Console.WriteLine($"Calculating large cycle {i + 1} with heuristics");
             (ulong largeModulus, ulong largeCycle) = NextLargeModulusAndCycle();

EvenPerfectBitScanner.Benchmarks/Pow2MontgomeryModWindowedBenchmarkData.cs

@@ -64,7 +64,7 @@ internal static class Pow2MontgomeryModWindowedBenchmarkInputsProvider
         {
             Pow2MontgomeryModWindowedBenchmarkSeed seed = seeds[i];
             ulong modulus = 2UL * seed.Multiplier * seed.Exponent + 1UL;
-            MontgomeryDivisorData divisor = MontgomeryDivisorData.FromModulus(modulus);
+            MontgomeryDivisorData divisor = MontgomeryDivisorDataPool.Shared.FromModulus(modulus);
             ulong cycleLength = MersenneDivisorCycles.CalculateCycleLength(modulus, divisor);
             ulong reducedExponent = seed.Exponent % cycleLength;
             cases[i] = new Pow2MontgomeryModWindowedBenchmarkCase(

PerfectNumbers.Core.Tests/Gpu/PrimeOrderGpuHeuristicsTests.cs

@@ -23,7 +23,7 @@ public class PrimeOrderGpuHeuristicsTests
         try
         {
             PrimeOrderGpuHeuristics.OverflowRegistry[prime] = 0;
-            MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(prime);
+            MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(prime);
             GpuPow2ModStatus status = PrimeOrderGpuHeuristics.TryPow2Mod(1UL, prime, out ulong remainder, divisorData);
 
             status.Should().Be(GpuPow2ModStatus.Overflow);
@@ -40,7 +40,7 @@ public class PrimeOrderGpuHeuristicsTests
     {
         const ulong exponent = 138_000_001UL;
         const ulong prime = 138_000_001UL;
-        MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(prime);
+        MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(prime);
         GpuPow2ModStatus status = PrimeOrderGpuHeuristics.TryPow2Mod(exponent, prime, out ulong remainder, divisorData);
 
         status.Should().Be(GpuPow2ModStatus.Success);
@@ -55,7 +55,7 @@ public class PrimeOrderGpuHeuristicsTests
         PrimeOrderGpuHeuristics.OverrideCapabilitiesForTesting(capability);
         try
         {
-            MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(prime);
+            MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(prime);
             GpuPow2ModStatus status = PrimeOrderGpuHeuristics.TryPow2Mod(1UL, prime, out ulong remainder, divisorData);
 
             status.Should().Be(GpuPow2ModStatus.Overflow);
@@ -76,7 +76,7 @@ public class PrimeOrderGpuHeuristicsTests
         try
         {
             const ulong prime = 193UL;
-            MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(prime);
+            MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(prime);
             GpuPow2ModStatus status = PrimeOrderGpuHeuristics.TryPow2Mod(16UL, prime, out ulong remainder, divisorData);
 
             status.Should().Be(GpuPow2ModStatus.Overflow);
@@ -102,7 +102,7 @@ public class PrimeOrderGpuHeuristicsTests
 
             ulong[] remainders = new ulong[2];
             ulong[] exponents = { 1UL, 2UL };
-            MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(prime);
+            MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(prime);
             GpuPow2ModStatus status = PrimeOrderGpuHeuristics.TryPow2ModBatch(exponents, prime, remainders, divisorData);
 
             status.Should().Be(GpuPow2ModStatus.Overflow);
@@ -121,7 +121,7 @@ public class PrimeOrderGpuHeuristicsTests
         ulong[] remainders = { 123UL, 456UL };
         ulong[] exponents = { 138_000_001UL, 138_000_011UL };
         const ulong prime = 138_000_001UL;
-        MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(prime);
+        MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(prime);
         GpuPow2ModStatus status = PrimeOrderGpuHeuristics.TryPow2ModBatch(exponents, prime, remainders, divisorData);
 
         ulong expectedFirst = (ulong)BigInteger.ModPow(2, exponents[0], prime);
@@ -145,7 +145,7 @@ public class PrimeOrderGpuHeuristicsTests
             ulong[] exponents = { 1UL, 2UL };
             ulong[] remainders = { 5UL, 6UL };
 
-            MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(prime);
+            MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(prime);
             GpuPow2ModStatus status = PrimeOrderGpuHeuristics.TryPow2ModBatch(exponents, prime, remainders, divisorData);
 
             status.Should().Be(GpuPow2ModStatus.Overflow);
@@ -170,7 +170,7 @@ public class PrimeOrderGpuHeuristicsTests
             ulong[] remainders = { 9UL, 11UL };
 
             const ulong prime = 193UL;
-            MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(prime);
+            MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(prime);
             GpuPow2ModStatus status = PrimeOrderGpuHeuristics.TryPow2ModBatch(exponents, prime, remainders, divisorData);
 
             status.Should().Be(GpuPow2ModStatus.Overflow);
@@ -362,7 +362,7 @@ public class PrimeOrderGpuHeuristicsTests
         {
             PrimeOrderGpuHeuristics.OverflowRegistry[prime] = 0;
 
-            MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(prime);
+            MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(prime);
             ulong result = PrimeOrderCalculator.Calculate(prime, null, divisorData, PrimeOrderCalculator.PrimeOrderSearchConfig.HeuristicDefault, PrimeOrderCalculator.PrimeOrderHeuristicDevice.Gpu);
 
             result.Should().Be(3UL);

PerfectNumbers.Core.Tests/Gpu/ULongExtensionsGpuTests.cs

@@ -17,7 +17,7 @@ public class ULongExtensionsGpuTests
     [InlineData(65535UL, 2147483647UL)]
     public void Pow2ModWindowedGpu_matches_montgomery_cpu_for_known_values(ulong exponent, ulong modulus)
     {
-        MontgomeryDivisorData divisor = MontgomeryDivisorData.FromModulus(modulus);
+        MontgomeryDivisorData divisor = MontgomeryDivisorDataPool.Shared.FromModulus(modulus);
         ulong expected = exponent.Pow2MontgomeryModWindowedCpu(divisor, keepMontgomery: false);
 
         exponent.Pow2ModWindowedGpu(modulus).Should().Be(expected);
@@ -51,7 +51,7 @@ public class ULongExtensionsGpuTests
 
         foreach (ulong modulus in moduli)
         {
-            MontgomeryDivisorData divisor = MontgomeryDivisorData.FromModulus(modulus);
+            MontgomeryDivisorData divisor = MontgomeryDivisorDataPool.Shared.FromModulus(modulus);
             foreach (ulong exponent in exponents)
             {
                 ulong expected = exponent.Pow2MontgomeryModWindowedCpu(divisor, keepMontgomery: false);

PerfectNumbers.Core.Tests/MersenneDivisorCyclesGenerateGpuTests.cs

@@ -38,7 +38,7 @@ public class MersenneDivisorCyclesGenerateGpuTests
             foreach (var pair in pairs)
             {
                 expected.Should().Contain(pair.divisor);
-                MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(pair.divisor);
+                MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(pair.divisor);
                 pair.cycle.Should().Be(MersenneDivisorCycles.CalculateCycleLength(pair.divisor, divisorData));
             }
         }
@@ -87,7 +87,7 @@ public class MersenneDivisorCyclesGenerateGpuTests
             foreach (var pair in pairs)
             {
                 uniqueDivisors.Add(pair.divisor).Should().BeTrue();
-                MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(pair.divisor);
+                MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(pair.divisor);
                 pair.cycle.Should().Be(MersenneDivisorCycles.CalculateCycleLength(pair.divisor, divisorData));
             }
 

PerfectNumbers.Core.Tests/MersenneDivisorCyclesTests.cs

@@ -18,7 +18,7 @@ public class MersenneDivisorCyclesTests
     [MemberData(nameof(Divisors))]
     public void CalculateCycleLength_returns_expected_value(ulong divisor, ulong expected)
     {
-        MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(divisor);
+        MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(divisor);
         MersenneDivisorCycles.CalculateCycleLength(divisor, divisorData).Should().Be(expected);
         MersenneDivisorCycles.CalculateCycleLengthGpu(divisor).Should().Be(expected);
     }

PerfectNumbers.Core.Tests/MersenneNumberDivisorCpuTesterTests.cs

@@ -39,13 +39,13 @@ public class MersenneNumberDivisorCpuTesterTests
                         ulong[] primes = { 5UL, 7UL, 11UL, 13UL };
                         byte[] hits = new byte[primes.Length];
 
-                        ulong cycle23 = MersenneDivisorCycles.CalculateCycleLength(23UL, MontgomeryDivisorData.FromModulus(23UL));
-                        session.CheckDivisor(23UL, MontgomeryDivisorData.FromModulus(23UL), cycle23, primes, hits);
+                        ulong cycle23 = MersenneDivisorCycles.CalculateCycleLength(23UL, MontgomeryDivisorDataPool.Shared.FromModulus(23UL));
+                        session.CheckDivisor(23UL, MontgomeryDivisorDataPool.Shared.FromModulus(23UL), cycle23, primes, hits);
                         hits.Should().ContainInOrder(new byte[] { 0, 0, 1, 0 });
 
                         Array.Fill(hits, (byte)0);
-                        ulong cycle31 = MersenneDivisorCycles.CalculateCycleLength(31UL, MontgomeryDivisorData.FromModulus(31UL));
-                        session.CheckDivisor(31UL, MontgomeryDivisorData.FromModulus(31UL), cycle31, primes, hits);
+                        ulong cycle31 = MersenneDivisorCycles.CalculateCycleLength(31UL, MontgomeryDivisorDataPool.Shared.FromModulus(31UL));
+                        session.CheckDivisor(31UL, MontgomeryDivisorDataPool.Shared.FromModulus(31UL), cycle31, primes, hits);
                         hits.Should().ContainInOrder(new byte[] { 1, 0, 0, 0 });
                 }
                 finally
@@ -67,7 +67,7 @@ public class MersenneNumberDivisorCpuTesterTests
                         ulong[] exponents = { 6UL, 7UL, 9UL, 10UL, 12UL };
                         byte[] hits = new byte[exponents.Length];
 
-                        MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(7UL);
+                        MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(7UL);
                         ulong cycle = MersenneDivisorCycles.CalculateCycleLength(7UL, divisorData);
                         session.CheckDivisor(7UL, divisorData, cycle, exponents, hits);
 
@@ -92,7 +92,7 @@ public class MersenneNumberDivisorCpuTesterTests
                         ulong[] exponents = { 10UL, 11UL, 20UL, 21UL, 30UL };
                         byte[] hits = new byte[exponents.Length];
 
-                        MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(11UL);
+                        MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(11UL);
                         ulong cycle = MersenneDivisorCycles.CalculateCycleLength(11UL, divisorData);
                         session.CheckDivisor(11UL, divisorData, cycle, exponents, hits);
 

PerfectNumbers.Core.Tests/MersenneNumberDivisorGpuTesterTests.cs

@@ -170,7 +170,7 @@ public class MersenneNumberDivisorGpuTesterTests
             ulong[] primes = { 31UL, 37UL, 41UL };
             byte[] hits = new byte[primes.Length];
 
-            session.CheckDivisor(223UL, MontgomeryDivisorData.FromModulus(223UL), 0UL, primes, hits);
+            session.CheckDivisor(223UL, MontgomeryDivisorDataPool.Shared.FromModulus(223UL), 0UL, primes, hits);
 
             hits.Should().ContainInOrder(new byte[] { 0, 1, 0 });
         }
@@ -193,13 +193,13 @@ public class MersenneNumberDivisorGpuTesterTests
             ulong[] primes = { 31UL, 37UL, 41UL, 43UL };
             byte[] hits = new byte[primes.Length];
 
-            ulong cycle223 = MersenneDivisorCycles.CalculateCycleLength(223UL, MontgomeryDivisorData.FromModulus(223UL));
-            session.CheckDivisor(223UL, MontgomeryDivisorData.FromModulus(223UL), cycle223, primes, hits);
+            ulong cycle223 = MersenneDivisorCycles.CalculateCycleLength(223UL, MontgomeryDivisorDataPool.Shared.FromModulus(223UL));
+            session.CheckDivisor(223UL, MontgomeryDivisorDataPool.Shared.FromModulus(223UL), cycle223, primes, hits);
             hits.Should().ContainInOrder(new byte[] { 0, 1, 0, 0 });
 
             Array.Fill(hits, (byte)0);
-            ulong cycle13367 = MersenneDivisorCycles.CalculateCycleLength(13367UL, MontgomeryDivisorData.FromModulus(13367UL));
-            session.CheckDivisor(13367UL, MontgomeryDivisorData.FromModulus(13367UL), cycle13367, primes, hits);
+            ulong cycle13367 = MersenneDivisorCycles.CalculateCycleLength(13367UL, MontgomeryDivisorDataPool.Shared.FromModulus(13367UL));
+            session.CheckDivisor(13367UL, MontgomeryDivisorDataPool.Shared.FromModulus(13367UL), cycle13367, primes, hits);
             hits.Should().ContainInOrder(new byte[] { 0, 0, 1, 0 });
         }
         finally
@@ -225,8 +225,8 @@ public class MersenneNumberDivisorGpuTesterTests
             ulong[] primes = { 31UL, 37UL, 41UL, 43UL, 47UL };
             byte[] hits = new byte[primes.Length];
 
-            ulong cycle223 = MersenneDivisorCycles.CalculateCycleLength(223UL, MontgomeryDivisorData.FromModulus(223UL));
-            session.CheckDivisor(223UL, MontgomeryDivisorData.FromModulus(223UL), cycle223, primes, hits);
+            ulong cycle223 = MersenneDivisorCycles.CalculateCycleLength(223UL, MontgomeryDivisorDataPool.Shared.FromModulus(223UL));
+            session.CheckDivisor(223UL, MontgomeryDivisorDataPool.Shared.FromModulus(223UL), cycle223, primes, hits);
 
             hits.Should().ContainInOrder(new byte[] { 0, 1, 0, 0, 0 });
         }
@@ -252,7 +252,7 @@ public class MersenneNumberDivisorGpuTesterTests
             ulong[] exponents = { 6UL, 7UL, 9UL, 10UL, 12UL };
             byte[] hits = new byte[exponents.Length];
 
-            MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(7UL);
+            MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(7UL);
             ulong cycle = MersenneDivisorCycles.CalculateCycleLength(7UL, divisorData);
 
             session.CheckDivisor(7UL, divisorData, cycle, exponents, hits);
@@ -281,7 +281,7 @@ public class MersenneNumberDivisorGpuTesterTests
             ulong[] exponents = { 10UL, 11UL, 20UL, 21UL, 30UL };
             byte[] hits = new byte[exponents.Length];
 
-            MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(11UL);
+            MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(11UL);
             ulong cycle = MersenneDivisorCycles.CalculateCycleLength(11UL, divisorData);
 
             session.CheckDivisor(11UL, divisorData, cycle, exponents, hits);
@@ -310,7 +310,7 @@ public class MersenneNumberDivisorGpuTesterTests
             var patchedTable = new List<(ulong Divisor, ulong Cycle)>();
             ulong[] patchedSmall = new ulong[PerfectNumberConstants.MaxQForDivisorCycles + 1];
 
-            MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(191UL);
+            MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(191UL);
             patchedSmall[191] = MersenneDivisorCycles.CalculateCycleLength(191UL, divisorData);
 
             tableField.SetValue(cycles, patchedTable);
@@ -353,8 +353,8 @@ public class MersenneNumberDivisorGpuTesterTests
             ulong[] primes = { 31UL, 37UL, 41UL, 43UL, 47UL };
             byte[] hits = new byte[primes.Length];
 
-            ulong cycle223 = MersenneDivisorCycles.CalculateCycleLength(223UL, MontgomeryDivisorData.FromModulus(223UL));
-            session.CheckDivisor(223UL, MontgomeryDivisorData.FromModulus(223UL), cycle223, primes, hits);
+            ulong cycle223 = MersenneDivisorCycles.CalculateCycleLength(223UL, MontgomeryDivisorDataPool.Shared.FromModulus(223UL));
+            session.CheckDivisor(223UL, MontgomeryDivisorDataPool.Shared.FromModulus(223UL), cycle223, primes, hits);
 
             hits.Should().ContainInOrder(new byte[] { 0, 1, 0, 0, 0 });
         }

PerfectNumbers.Core.Tests/PrimeOrderCalculatorTests.cs

@@ -46,7 +46,7 @@ public class PrimeOrderCalculatorTests
         ulong result = PrimeOrderCalculator.Calculate(
             prime,
             previousOrder: null,
-            MontgomeryDivisorData.FromModulus(prime),
+            MontgomeryDivisorDataPool.Shared.FromModulus(prime),
             PrimeOrderCalculator.PrimeOrderSearchConfig.HeuristicDefault,
 			      PrimeOrderCalculator.PrimeOrderHeuristicDevice.Gpu);
 
@@ -63,14 +63,14 @@ public class PrimeOrderCalculatorTests
         ulong heuristic = PrimeOrderCalculator.Calculate(
             prime,
             previousOrder,
-            MontgomeryDivisorData.FromModulus(prime),
+            MontgomeryDivisorDataPool.Shared.FromModulus(prime),
             PrimeOrderCalculator.PrimeOrderSearchConfig.HeuristicDefault,
 			      PrimeOrderCalculator.PrimeOrderHeuristicDevice.Gpu);
 
         ulong strict = PrimeOrderCalculator.Calculate(
             prime,
             previousOrder: null,
-            MontgomeryDivisorData.FromModulus(prime),
+            MontgomeryDivisorDataPool.Shared.FromModulus(prime),
             PrimeOrderCalculator.PrimeOrderSearchConfig.StrictDefault,
 			      PrimeOrderCalculator.PrimeOrderHeuristicDevice.Gpu);
 
@@ -86,7 +86,7 @@ public class PrimeOrderCalculatorTests
         ulong result = PrimeOrderCalculator.Calculate(
             prime,
             previousOrder: null,
-            MontgomeryDivisorData.FromModulus(prime),
+            MontgomeryDivisorDataPool.Shared.FromModulus(prime),
             PrimeOrderCalculator.PrimeOrderSearchConfig.HeuristicDefault,
 			      PrimeOrderCalculator.PrimeOrderHeuristicDevice.Gpu);
 
@@ -106,7 +106,7 @@ public class PrimeOrderCalculatorTests
         ulong result = PrimeOrderCalculator.Calculate(
             prime: 13UL,
             previousOrder: null,
-            MontgomeryDivisorData.FromModulus(13UL),
+            MontgomeryDivisorDataPool.Shared.FromModulus(13UL),
             config,
 			      PrimeOrderCalculator.PrimeOrderHeuristicDevice.Gpu);
 
@@ -123,7 +123,7 @@ public class PrimeOrderCalculatorTests
             maxPowChecks: 1,
             mode: PrimeOrderCalculator.PrimeOrderMode.Heuristic);
 
-        MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(239UL);
+        MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(239UL);
         ulong heuristic = PrimeOrderCalculator.Calculate(
             prime: 239UL,
             previousOrder: null,

PerfectNumbers.Core/Cpu/MersenneCpuDivisorScanSession.cs

@@ -21,10 +21,10 @@ internal sealed class MersenneCpuDivisorScanSession : IMersenneNumberDivisorByDi
         //     return;
         // }
 
-        MontgomeryDivisorData cachedData = divisorData;
-        if (cachedData.Modulus != divisor)
+        if (divisorData.Modulus != divisor)
         {
-            cachedData = MontgomeryDivisorData.FromModulus(divisor);
+			throw new InvalidOperationException("Divisor data is for a different modulus");
+            // cachedData = MontgomeryDivisorData.FromModulus(divisor);
         }
 
         if (divisorCycle == 0UL)
@@ -39,7 +39,7 @@ internal sealed class MersenneCpuDivisorScanSession : IMersenneNumberDivisorByDi
 
         // Keep these remainder steppers in place so future updates continue reusing the previously computed residues.
         // They are critical for avoiding repeated full Montgomery exponentiation work when scanning divisors.
-        var exponentStepper = new ExponentRemainderStepperCpu(cachedData);
+        var exponentStepper = new ExponentRemainderStepperCpu(divisorData);
 
         var cycleStepper = new CycleRemainderStepper(divisorCycle);
 

PerfectNumbers.Core/Cpu/MersenneNumberDivisorByDivisorCpuTester.cs

@@ -204,43 +204,37 @@ public sealed class MersenneNumberDivisorByDivisorCpuTester : IMersenneNumberDiv
 		remainder11 = (byte)((((divisorHigh % 11UL) * 5UL) + (divisorLow % 11UL)) % 11UL);
 
 		var gpu = PrimeOrderCalculatorAccelerator.Rent(1);
-
+		var divisorPool = MontgomeryDivisorDataPool.Shared;
 		while (divisor.CompareTo(limit) <= 0)
 		{
 			bool passesSmallModuli = remainder3 != 0 && remainder7 != 0 && remainder11 != 0;
 			if (passesSmallModuli && (remainder8 == 1 || remainder8 == 7) && ((decimalMask >> remainder10) & 1) != 0)
 			{
 				ulong candidate = divisor.Low;
-				MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(candidate);
+				MontgomeryDivisorData divisorData = divisorPool.FromModulus(candidate);
 				ulong divisorCycle;
 				// Divisors generated from 2 * k * p + 1 exceed the small-cycle snapshot when p >= 138,000,000, so the short path below never runs.
-				// if (candidate <= PerfectNumberConstants.MaxQForDivisorCycles)
-				// {
-				//     divisorCycle = cycleCache.GetCycleLength(candidate);
-				// }
-				// else
+				if (!MersenneDivisorCycles.TryCalculateCycleLengthForExponentCpu(
+						gpu,
+						candidate,
+						prime,
+						divisorData,
+						out ulong computedCycle,
+						out bool primeOrderFailed) || computedCycle == 0UL)
 				{
-					if (!MersenneDivisorCycles.TryCalculateCycleLengthForExponentCpu(
-							gpu,
-							candidate,
-							prime,
-							divisorData,
-							out ulong computedCycle,
-							out bool primeOrderFailed) || computedCycle == 0UL)
-					{
-						// Divisors produced by 2 * k * p + 1 always exceed PerfectNumberConstants.MaxQForDivisorCycles
-						// for the exponents scanned here, so skip the unused cache fallback and compute directly.
-						divisorCycle = MersenneDivisorCycles.CalculateCycleLength(
-							candidate,
-							divisorData,
-							skipPrimeOrderHeuristic: primeOrderFailed);
-					}
-					else
-					{
-						divisorCycle = computedCycle;
-					}
+					// Divisors produced by 2 * k * p + 1 always exceed PerfectNumberConstants.MaxQForDivisorCycles
+					// for the exponents scanned here, so skip the unused cache fallback and compute directly.
+					divisorCycle = MersenneDivisorCycles.CalculateCycleLength(
+						candidate,
+						divisorData,
+						skipPrimeOrderHeuristic: primeOrderFailed);
+				}
+				else
+				{
+					divisorCycle = computedCycle;
 				}
 
+				divisorPool.Return(divisorData);
 				if (divisorCycle == prime)
 				{
 					// A cycle equal to the tested exponent (which is prime in this path) guarantees that the candidate divides
@@ -290,18 +284,16 @@ public sealed class MersenneNumberDivisorByDivisorCpuTester : IMersenneNumberDiv
 		out bool processedAll,
 		out ulong foundDivisor)
 	{
-		processedAll = false;
-		foundDivisor = 0UL;
-
 		bool canAdvance = step <= limit;
 		var gpu = PrimeOrderCalculatorAccelerator.Rent(1);
+		Queue<MontgomeryDivisorData> divisorPool = MontgomeryDivisorDataPool.Shared;
 		if (!canAdvance)
 		{
 			if (divisor <= limit)
 			{
 				if (remainder3 != 0 && remainder7 != 0 && remainder11 != 0 && (remainder8 == 1 || remainder8 == 7) && ((decimalMask >> remainder10) & 1) != 0)
 				{
-					MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(divisor);
+					MontgomeryDivisorData divisorData = divisorPool.FromModulus(divisor);
 					ulong divisorCycle;
 					if (!MersenneDivisorCycles.TryCalculateCycleLengthForExponentCpu(
 							gpu,
@@ -321,6 +313,8 @@ public sealed class MersenneNumberDivisorByDivisorCpuTester : IMersenneNumberDiv
 						divisorCycle = computedCycle;
 					}
 
+					divisorPool.Return(divisorData);
+
 					if (divisorCycle == prime)
 					{
 						foundDivisor = divisor;
@@ -351,13 +345,12 @@ public sealed class MersenneNumberDivisorByDivisorCpuTester : IMersenneNumberDiv
 		}
 
 		ulong remainingIterations = ((limit - divisor) / step) + 1UL;
-
 		while (true)
 		{
 			bool passesSmallModuli = remainder3 != 0 && remainder7 != 0 && remainder11 != 0;
 			if (passesSmallModuli && (remainder8 == 1 || remainder8 == 7) && ((decimalMask >> remainder10) & 1) != 0)
 			{
-				MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(divisor);
+				MontgomeryDivisorData divisorData = divisorPool.FromModulus(divisor);
 				ulong divisorCycle;
 				if (!MersenneDivisorCycles.TryCalculateCycleLengthForExponentCpu(
 						gpu,
@@ -377,6 +370,7 @@ public sealed class MersenneNumberDivisorByDivisorCpuTester : IMersenneNumberDiv
 					divisorCycle = computedCycle;
 				}
 
+				divisorPool.Return(divisorData);
 				if (divisorCycle == prime)
 				{
 					foundDivisor = divisor;

PerfectNumbers.Core/DivisorCycleCache.cs

@@ -76,19 +76,23 @@ public sealed class DivisorCycleCache
 		// }
 
 		ulong[] snapshot = _snapshot;
+		ulong cycleLength;
 		if (divisor < (ulong)snapshot.Length)
 		{
-			ulong cached = snapshot[divisor];
-			if (cached == 0UL)
+			cycleLength = snapshot[divisor];
+			if (cycleLength == 0UL)
 			{
 				throw new InvalidDataException($"Divisor cycle is missing for {divisor}");
 			}
 
-			return cached;
+			return cycleLength;
 		}
 
-		MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(divisor);
-		return MersenneDivisorCycles.CalculateCycleLength(divisor, divisorData, skipPrimeOrderHeuristic: true);
+		Queue<MontgomeryDivisorData> divisorPool = MontgomeryDivisorDataPool.Shared;
+		MontgomeryDivisorData divisorData = divisorPool.FromModulus(divisor);
+		cycleLength = MersenneDivisorCycles.CalculateCycleLength(divisor, divisorData, skipPrimeOrderHeuristic: true);
+		divisorPool.Return(divisorData);
+		return cycleLength;
 	}
 
 	public void GetCycleLengths(ReadOnlySpan<ulong> divisors, Span<ulong> cycles)
@@ -185,12 +189,14 @@ public sealed class DivisorCycleCache
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
 	private static void ComputeCyclesCpu(ReadOnlySpan<ulong> divisors, Span<ulong> cycles, ReadOnlySpan<int> indices)
 	{
+		Queue<MontgomeryDivisorData> divisorPool = MontgomeryDivisorDataPool.Shared;
 		for (int i = 0; i < indices.Length; i++)
 		{
 			int targetIndex = indices[i];
 			ulong divisor = divisors[targetIndex];
-			MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(divisor);
+			MontgomeryDivisorData divisorData = divisorPool.FromModulus(divisor);
 			cycles[targetIndex] = MersenneDivisorCycles.CalculateCycleLength(divisor, divisorData);
+			divisorPool.Return(divisorData);
 		}
 	}
 

PerfectNumbers.Core/Gpu/Accelerators/PrimeOrderCalculatorAccelerator.cs

@@ -69,6 +69,7 @@ public sealed class PrimeOrderCalculatorAccelerator
 			AcceleratorStream stream = accelerator.CreateStream();
 			// TODO: Review which tables are needed when final execution path is defined.
 			LastDigitGpuTables.WarmUp(i, stream);
+			_kernels[i] = new CalculatorKernels(accelerator);
 			// HeuristicCombinedGpuTables.WarmUp(i, stream);
 			// SmallPrimeFactorGpuTables.WarmUp(i, stream);
 			// SharedHeuristicGpuTables.EnsureStaticTables(accelerator, stream);
@@ -115,18 +116,41 @@ public sealed class PrimeOrderCalculatorAccelerator
 
 	public Dictionary<ulong, int> Pow2ModEntriesToTestOnHost = [];
 
+	private static readonly CalculatorKernels[] _kernels =new CalculatorKernels[AcceleratorPool.Shared.Accelerators.Length];
+
+	private sealed class CalculatorKernels(Accelerator accelerator)
+	{
+		public readonly Kernel CheckFactorsKernel = KernelUtil.GetKernel(accelerator.LoadStreamKernel<int, ulong, ArrayView1D<KeyValuePair<ulong, int>, Stride1D.Dense>, ulong, ulong, ulong, ulong, ulong, ArrayView1D<ulong, Stride1D.Dense>>(PrimeOrderGpuHeuristics.CheckFactorsKernel));
+
+		public readonly Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, ulong, ulong, ulong, ulong, ulong, ArrayView1D<ulong, Stride1D.Dense>> ConvertToStandardKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ArrayView1D<ulong, Stride1D.Dense>, ulong, ulong, ulong, ulong, ulong, ArrayView1D<ulong, Stride1D.Dense>>(Pow2MontgomeryKernels.Pow2MontgomeryKernelConvertToStandard)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, ulong, ulong, ulong, ulong, ulong, ArrayView1D<ulong, Stride1D.Dense>>>();
+
+		public readonly Action<AcceleratorStream, Index1D, byte, ArrayView<int>, ulong, ulong, HeuristicCombinedGpuViews> HeuristicCombinedTrialDivisionKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, byte, ArrayView<int>, ulong, ulong, HeuristicCombinedGpuViews>(PrimeTesterKernels.HeuristicTrialCombinedDivisionKernel)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, byte, ArrayView<int>, ulong, ulong, HeuristicCombinedGpuViews>>();
+
+		public readonly Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, ulong, ulong, ulong, ulong, ulong, ArrayView1D<ulong, Stride1D.Dense>> KeepMontgomeryKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ArrayView1D<ulong, Stride1D.Dense>, ulong, ulong, ulong, ulong, ulong, ArrayView1D<ulong, Stride1D.Dense>>(Pow2MontgomeryKernels.Pow2MontgomeryKernelKeepMontgomery)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, ulong, ulong, ulong, ulong, ulong, ArrayView1D<ulong, Stride1D.Dense>>>();
+
+		public readonly Kernel PollardRhoKernel = KernelUtil.GetKernel(accelerator.LoadStreamKernel<ulong, int, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<byte, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>>(Pow2MontgomeryKernels.TryPollardRhoKernel));
+
+		public readonly Action<AcceleratorStream, Index1D, ArrayView1D<GpuUInt128, Stride1D.Dense>, GpuUInt128, ArrayView1D<GpuUInt128, Stride1D.Dense>> Pow2ModWideKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ArrayView1D<GpuUInt128, Stride1D.Dense>, GpuUInt128, ArrayView1D<GpuUInt128, Stride1D.Dense>>(PrimeOrderGpuHeuristics.Pow2ModKernelWide)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ArrayView1D<GpuUInt128, Stride1D.Dense>, GpuUInt128, ArrayView1D<GpuUInt128, Stride1D.Dense>>>();
+
+		public readonly Action<AcceleratorStream, Index1D, ArrayView<ulong>, ArrayView<byte>> SharesFactorKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ArrayView<ulong>, ArrayView<byte>>(PrimeTesterKernels.SharesFactorKernel)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ArrayView<ulong>, ArrayView<byte>>>();
+
+		public readonly Action<AcceleratorStream, Index1D, ulong, uint, ArrayView1D<uint, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>, int, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<int, Stride1D.Dense>, ArrayView1D<int, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>> SmallPrimeFactorKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ulong, uint, ArrayView1D<uint, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>, int, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<int, Stride1D.Dense>, ArrayView1D<int, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>>(SmallPrimeFactorKernels.SmallPrimeFactorKernelScan)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ulong, uint, ArrayView1D<uint, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>, int, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<int, Stride1D.Dense>, ArrayView1D<int, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>>>();
+
+		public readonly Action<AcceleratorStream, Index1D, ArrayView<ulong>, ArrayView<uint>, ArrayView<uint>, ArrayView<uint>, ArrayView<uint>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<byte>> SmallPrimeSieveKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ArrayView<ulong>, ArrayView<uint>, ArrayView<uint>, ArrayView<uint>, ArrayView<uint>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<byte>>(PrimeTesterKernels.SmallPrimeSieveKernel)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ArrayView<ulong>, ArrayView<uint>, ArrayView<uint>, ArrayView<uint>, ArrayView<uint>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<byte>>>();
+
+		public readonly Action<AcceleratorStream, Index1D, ulong, ArrayView1D<ulong, Stride1D.Dense>, int, ulong, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>> SpecialMaxKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ulong, ArrayView1D<ulong, Stride1D.Dense>, int, ulong, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>>(PrimeOrderGpuHeuristics.EvaluateSpecialMaxCandidatesKernel)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ulong, ArrayView1D<ulong, Stride1D.Dense>, int, ulong, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>>>();
+	}
+
 	public readonly Kernel CheckFactorsKernel;
-
-	public readonly Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>> ConvertToStandardKernelLauncher;
-
+	public readonly Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, ulong, ulong, ulong, ulong, ulong, ArrayView1D<ulong, Stride1D.Dense>> ConvertToStandardKernelLauncher;
 	public readonly Action<AcceleratorStream, Index1D, byte, ArrayView<int>, ulong, ulong, HeuristicCombinedGpuViews> HeuristicCombinedTrialDivisionKernelLauncher;
-	public readonly Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>> KeepMontgomeryKernelLauncher;
+	public readonly Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, ulong, ulong, ulong, ulong, ulong, ArrayView1D<ulong, Stride1D.Dense>> KeepMontgomeryKernelLauncher;
 	public readonly Kernel PollardRhoKernel;
 	public readonly Action<AcceleratorStream, Index1D, ArrayView1D<GpuUInt128, Stride1D.Dense>, GpuUInt128, ArrayView1D<GpuUInt128, Stride1D.Dense>> Pow2ModWideKernelLauncher;
 	public readonly Action<AcceleratorStream, Index1D, ArrayView<ulong>, ArrayView<byte>> SharesFactorKernelLauncher;
 	public readonly Action<AcceleratorStream, Index1D, ulong, uint, ArrayView1D<uint, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>, int, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<int, Stride1D.Dense>, ArrayView1D<int, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>> SmallPrimeFactorKernelLauncher;
 	public readonly Action<AcceleratorStream, Index1D, ArrayView<ulong>, ArrayView<uint>, ArrayView<uint>, ArrayView<uint>, ArrayView<uint>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<byte>> SmallPrimeSieveKernelLauncher;
-	public readonly Action<AcceleratorStream, Index1D, ulong, ArrayView1D<ulong, Stride1D.Dense>, int, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>> SpecialMaxKernelLauncher;
+	public readonly Action<AcceleratorStream, Index1D, ulong, ArrayView1D<ulong, Stride1D.Dense>, int, ulong, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>> SpecialMaxKernelLauncher;
 
 	public void EnsureCapacity(int factorsCount, int primeTesterCapacity)
 	{
@@ -260,25 +284,18 @@ public sealed class PrimeOrderCalculatorAccelerator
 				SmallPrimeFactorSquares = tables.Squares.View;
 			}
 
-			CheckFactorsKernel = KernelUtil.GetKernel(accelerator.LoadStreamKernel<int, ulong, ArrayView1D<KeyValuePair<ulong, int>, Stride1D.Dense>, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>>(PrimeOrderGpuHeuristics.CheckFactorsKernel));
+			var kernels = _kernels[acceleratorIndex];
 
-			ConvertToStandardKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ArrayView1D<ulong, Stride1D.Dense>, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>>(Pow2MontgomeryKernels.Pow2MontgomeryKernelConvertToStandard)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>>>();
-
-			HeuristicCombinedTrialDivisionKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, byte, ArrayView<int>, ulong, ulong, HeuristicCombinedGpuViews>(PrimeTesterKernels.HeuristicTrialCombinedDivisionKernel)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, byte, ArrayView<int>, ulong, ulong, HeuristicCombinedGpuViews>>();
-
-			KeepMontgomeryKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ArrayView1D<ulong, Stride1D.Dense>, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>>(Pow2MontgomeryKernels.Pow2MontgomeryKernelKeepMontgomery)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>>>();
-
-			PollardRhoKernel = KernelUtil.GetKernel(accelerator.LoadStreamKernel<ulong, int, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<byte, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>>(Pow2MontgomeryKernels.TryPollardRhoKernel));
-
-			Pow2ModWideKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ArrayView1D<GpuUInt128, Stride1D.Dense>, GpuUInt128, ArrayView1D<GpuUInt128, Stride1D.Dense>>(PrimeOrderGpuHeuristics.Pow2ModKernelWide)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ArrayView1D<GpuUInt128, Stride1D.Dense>, GpuUInt128, ArrayView1D<GpuUInt128, Stride1D.Dense>>>();
-
-			SharesFactorKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ArrayView<ulong>, ArrayView<byte>>(PrimeTesterKernels.SharesFactorKernel)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ArrayView<ulong>, ArrayView<byte>>>();
-
-			SmallPrimeFactorKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ulong, uint, ArrayView1D<uint, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>, int, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<int, Stride1D.Dense>, ArrayView1D<int, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>>(SmallPrimeFactorKernels.SmallPrimeFactorKernelScan)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ulong, uint, ArrayView1D<uint, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>, int, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<int, Stride1D.Dense>, ArrayView1D<int, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>>>();
-
-			SmallPrimeSieveKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ArrayView<ulong>, ArrayView<uint>, ArrayView<uint>, ArrayView<uint>, ArrayView<uint>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<byte>>(PrimeTesterKernels.SmallPrimeSieveKernel)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ArrayView<ulong>, ArrayView<uint>, ArrayView<uint>, ArrayView<uint>, ArrayView<uint>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<ulong>, ArrayView<byte>>>();
-
-			SpecialMaxKernelLauncher = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ulong, ArrayView1D<ulong, Stride1D.Dense>, int, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>>(PrimeOrderGpuHeuristics.EvaluateSpecialMaxCandidatesKernel)).CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ulong, ArrayView1D<ulong, Stride1D.Dense>, int, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>>>();
+			CheckFactorsKernel = kernels.CheckFactorsKernel;
+			ConvertToStandardKernelLauncher = kernels.ConvertToStandardKernelLauncher;
+			HeuristicCombinedTrialDivisionKernelLauncher = kernels.HeuristicCombinedTrialDivisionKernelLauncher;
+			KeepMontgomeryKernelLauncher = kernels.KeepMontgomeryKernelLauncher;
+			PollardRhoKernel = kernels.PollardRhoKernel;
+			Pow2ModWideKernelLauncher = kernels.Pow2ModWideKernelLauncher;
+			SharesFactorKernelLauncher = kernels.SharesFactorKernelLauncher;
+			SmallPrimeFactorKernelLauncher = kernels.SmallPrimeFactorKernelLauncher;
+			SmallPrimeSieveKernelLauncher = kernels.SmallPrimeSieveKernelLauncher;
+			SpecialMaxKernelLauncher = kernels.SpecialMaxKernelLauncher;
 		}
 	}
 

PerfectNumbers.Core/Gpu/Kernels/Pow2MontgomeryKernels.cs

@@ -17,18 +17,28 @@ internal static class Pow2MontgomeryKernels
 	public static void Pow2MontgomeryKernelKeepMontgomery(
 		Index1D index,
 		ArrayView1D<ulong, Stride1D.Dense> exponents,
-		MontgomeryDivisorData divisor,
+		ulong divisorModulus,
+		ulong divisorNPrime,
+		ulong divisorMontgomeryOne,
+		ulong divisorMontgomeryTwo,
+		ulong divisorMontgomeryTwoSquared,
 		ArrayView1D<ulong, Stride1D.Dense> results)
 	{
+		MontgomeryDivisorDataGpu divisor = new(divisorModulus, divisorNPrime, divisorMontgomeryOne, divisorMontgomeryTwo, divisorMontgomeryTwoSquared);
 		results[0] = ULongExtensions.Pow2MontgomeryModWindowedGpuKeepMontgomery(divisor, exponents[0]);
 	}
 
 	public static void Pow2MontgomeryKernelConvertToStandard(
 		Index1D index,
 		ArrayView1D<ulong, Stride1D.Dense> exponents,
-		MontgomeryDivisorData divisor,
+		ulong divisorModulus,
+		ulong divisorNPrime,
+		ulong divisorMontgomeryOne,
+		ulong divisorMontgomeryTwo,
+		ulong divisorMontgomeryTwoSquared,
 		ArrayView1D<ulong, Stride1D.Dense> results)
 	{
+		MontgomeryDivisorDataGpu divisor = new(divisorModulus, divisorNPrime, divisorMontgomeryOne, divisorMontgomeryTwo, divisorMontgomeryTwoSquared);
 		results[0] = ULongExtensions.Pow2MontgomeryModWindowedGpuConvertToStandard(divisor, exponents[0]);
 	}
 

PerfectNumbers.Core/Gpu/Kernels/PrimeOrderKernels.cs

@@ -11,12 +11,17 @@ internal static partial class PrimeOrderGpuHeuristics
 		int count,
 		ulong phi,
 		ArrayView1D<KeyValuePair<ulong, int>, Stride1D.Dense> toTest,
-		MontgomeryDivisorData divisorData,
+		ulong divisorModulus,
+		ulong divisorNPrime,
+		ulong divisorMontgomeryOne,
+		ulong divisorMontgomeryTwo,
+		ulong divisorMontgomeryTwoSquared,
 		ArrayView1D<ulong, Stride1D.Dense> result
 	)
 	{
 		ulong order = phi;
 		int entryCount = count;
+		MontgomeryDivisorDataGpu divisorData = new(divisorModulus, divisorNPrime, divisorMontgomeryOne, divisorMontgomeryTwo, divisorMontgomeryTwoSquared);
 
 		for (int i = 0; i < entryCount; i++)
 		{
@@ -155,7 +160,11 @@ internal static partial class PrimeOrderGpuHeuristics
 		Index1D index,
 		ulong prime,
 		OrderKernelConfig config,
-		MontgomeryDivisorData divisor,
+		ulong divisorModulus,
+		ulong divisorNPrime,
+		ulong divisorMontgomeryOne,
+		ulong divisorMontgomeryTwo,
+		ulong divisorMontgomeryTwoSquared,
 		ArrayView1D<uint, Stride1D.Dense> primes,
 		ArrayView1D<ulong, Stride1D.Dense> squares,
 		int primeCount,
@@ -227,6 +236,8 @@ internal static partial class PrimeOrderGpuHeuristics
 
 		SortFactors(phiFactors, phiExponents, phiFactorCount);
 
+		MontgomeryDivisorDataGpu divisor = new(divisorModulus, divisorNPrime, divisorMontgomeryOne, divisorMontgomeryTwo, divisorMontgomeryTwoSquared);
+
 		if (TrySpecialMaxKernel(phi, prime, phiFactors, phiFactorCount, divisor))
 		{
 			resultOut[0] = phi;
@@ -381,7 +392,7 @@ internal static partial class PrimeOrderGpuHeuristics
 		ulong prime,
 		ArrayView1D<ulong, Stride1D.Dense> factors,
 		int factorCount,
-		in MontgomeryDivisorData divisor)
+		in MontgomeryDivisorDataGpu divisor)
 	{
 		for (int i = 0; i < factorCount; i++)
 		{
@@ -401,7 +412,7 @@ internal static partial class PrimeOrderGpuHeuristics
 		return true;
 	}
 
-	private static ulong InitializeStartingOrderKernel(ulong prime, ulong phi, in MontgomeryDivisorData divisor)
+	private static ulong InitializeStartingOrderKernel(ulong prime, ulong phi, in MontgomeryDivisorDataGpu divisor)
 	{
 		ulong order = phi;
 		ulong residue = prime & 7UL;
@@ -423,7 +434,7 @@ internal static partial class PrimeOrderGpuHeuristics
 		ArrayView1D<ulong, Stride1D.Dense> factors,
 		ArrayView1D<int, Stride1D.Dense> exponents,
 		int factorCount,
-		in MontgomeryDivisorData divisor)
+		in MontgomeryDivisorDataGpu divisor)
 	{
 		for (int i = 0; i < factorCount; i++)
 		{
@@ -458,7 +469,7 @@ internal static partial class PrimeOrderGpuHeuristics
 	private static bool TryConfirmOrderKernel(
 		ulong prime,
 		ulong order,
-		in MontgomeryDivisorData divisor,
+		in MontgomeryDivisorDataGpu divisor,
 		uint limit,
 		ArrayView1D<uint, Stride1D.Dense> primes,
 		ArrayView1D<ulong, Stride1D.Dense> squares,
@@ -532,7 +543,7 @@ internal static partial class PrimeOrderGpuHeuristics
 		ulong order,
 		ulong previousOrder,
 		byte hasPreviousOrder,
-		in MontgomeryDivisorData divisor,
+		in MontgomeryDivisorDataGpu divisor,
 		uint limit,
 		int maxPowChecks,
 		ArrayView1D<uint, Stride1D.Dense> primes,
@@ -851,7 +862,7 @@ internal static partial class PrimeOrderGpuHeuristics
 	private static bool TryConfirmCandidateKernel(
 		ulong prime,
 		ulong candidate,
-		in MontgomeryDivisorData divisor,
+		in MontgomeryDivisorDataGpu divisor,
 		uint limit,
 		ArrayView1D<uint, Stride1D.Dense> primes,
 		ArrayView1D<ulong, Stride1D.Dense> squares,
@@ -1174,7 +1185,7 @@ internal static partial class PrimeOrderGpuHeuristics
 		}
 	}
 
-	private static bool Pow2EqualsOneKernel(ulong exponent, in MontgomeryDivisorData divisor)
+	private static bool Pow2EqualsOneKernel(ulong exponent, in MontgomeryDivisorDataGpu divisor)
 	{
 		return ULongExtensions.Pow2MontgomeryModWindowedGpuConvertToStandard(divisor, exponent) == 1UL;
 	}
@@ -1200,9 +1211,10 @@ internal static partial class PrimeOrderGpuHeuristics
 
 	/// This kernel always sets the result of the corresponding element. Callers don't need to clear the output buffers.
 
-	internal static void Pow2ModKernel(Index1D index, ArrayView1D<ulong, Stride1D.Dense> exponents, MontgomeryDivisorData divisor, ArrayView1D<ulong, Stride1D.Dense> remainders)
+	internal static void Pow2ModKernel(Index1D index, ArrayView1D<ulong, Stride1D.Dense> exponents, ulong divisorModulus, ulong divisorNPrime, ulong divisorMontgomeryOne, ulong divisorMontgomeryTwo, ulong divisorMontgomeryTwoSquared, ArrayView1D<ulong, Stride1D.Dense> remainders)
 	{
 		ulong exponent = exponents[index];
+		MontgomeryDivisorDataGpu divisor = new(divisorModulus, divisorNPrime, divisorMontgomeryOne, divisorMontgomeryTwo, divisorMontgomeryTwoSquared);
 		remainders[index] = ULongExtensions.Pow2MontgomeryModWindowedGpuConvertToStandard(divisor, exponent);
 	}
 

PerfectNumbers.Core/Gpu/Kernels/PrimeOrderSpecialMaxKernels.cs

@@ -10,7 +10,7 @@ internal static partial class PrimeOrderGpuHeuristics
         ulong phi,
         ArrayView1D<ulong, Stride1D.Dense> factors,
         int factorCount,
-        MontgomeryDivisorData divisor,
+        ulong divisorModulus,
         ArrayView1D<ulong, Stride1D.Dense> candidates,
         ArrayView1D<ulong, Stride1D.Dense> resultOut)
     {
@@ -57,7 +57,7 @@ internal static partial class PrimeOrderGpuHeuristics
             candidates[insert + 1] = current;
         }
 
-        var divisorPartial = new GpuDivisorPartialData(divisor.Modulus);
+        var divisorPartial = new GpuDivisorPartialData(divisorModulus);
         var stepper = new ExponentRemainderStepperGpu(divisorPartial);
         if (stepper.InitializeIsUnityGpu(candidates[0]))
         {

PerfectNumbers.Core/Gpu/MersenneNumberDivisorByDivisorGpuTester.cs

@@ -260,7 +260,7 @@ public sealed partial class MersenneNumberDivisorByDivisorGpuTester : IMersenneN
 		ArrayView1D<ulong, Stride1D.Dense> exponentViewDevice = exponentBuffer.View;
 		ArrayView1D<byte, Stride1D.Dense> hitsView = hitsBuffer.View;
 		ArrayView1D<int, Stride1D.Dense> hitIndexView = hitIndexBuffer.View;
-
+		Queue<MontgomeryDivisorData> divisorPool = MontgomeryDivisorDataPool.Shared;
 		while (remainingCount > 0UL && !composite)
 		{
 			int chunkCount = chunkCountBaseline;
@@ -284,7 +284,7 @@ public sealed partial class MersenneNumberDivisorByDivisorGpuTester : IMersenneN
 				if (passesSmallModuli && (localRemainder8 == 1 || localRemainder8 == 7) && ((decimalMask >> localRemainder10) & 1) != 0)
 				{
 					ulong divisorValue = (ulong)nextDivisor128;
-					MontgomeryDivisorData montgomeryData = MontgomeryDivisorData.FromModulus(divisorValue);
+					MontgomeryDivisorData montgomeryData = divisorPool.FromModulus(divisorValue);
 					ulong divisorCycle = ResolveDivisorCycle(gpu, divisorValue, prime, in montgomeryData);
 					if (divisorCycle == prime)
 					{
@@ -294,6 +294,7 @@ public sealed partial class MersenneNumberDivisorByDivisorGpuTester : IMersenneN
 						return true;
 					}
 
+					divisorPool.Return(montgomeryData);
 					divisorSpan[admissibleCount] = divisorValue;
 					divisorDataSpan[admissibleCount] = new GpuDivisorPartialData(divisorValue);
 					offsetSpan[admissibleCount] = admissibleCount;

PerfectNumbers.Core/Gpu/MontgomeryDivisorDataGpu.cs

@@ -0,0 +1,10 @@
+namespace PerfectNumbers.Core.Gpu;
+
+public readonly struct MontgomeryDivisorDataGpu(ulong modulus, ulong nPrime, ulong montgomeryOne, ulong montgomeryTwo, ulong montgomeryTwoSquared)
+{
+    public readonly ulong Modulus = modulus;
+	public readonly ulong NPrime = nPrime;
+	public readonly ulong MontgomeryOne = montgomeryOne;
+	public readonly ulong MontgomeryTwo = montgomeryTwo;
+	public readonly ulong MontgomeryTwoSquared = montgomeryTwoSquared;
+}

PerfectNumbers.Core/Gpu/Pow2MontgomeryGpuCalculator.cs

@@ -25,7 +25,7 @@ public static class Pow2MontgomeryGpuCalculator
 		// resultBuffer.MemSetToZero(stream);
 
 		var kernelLauncher = gpu.KeepMontgomeryKernelLauncher;
-		kernelLauncher(stream, 1, exponentBuffer.View, divisor, resultBuffer.View);
+		kernelLauncher(stream, 1, exponentBuffer.View, divisor.Modulus, divisor.NPrime, divisor.MontgomeryOne, divisor.MontgomeryTwo, divisor.MontgomeryTwoSquared, resultBuffer.View);
 
 		resultBuffer.View.CopyToCPU(stream, ref result, 1);
 		stream.Synchronize();
@@ -54,7 +54,7 @@ public static class Pow2MontgomeryGpuCalculator
 
 		var kernelLauncher = gpu.ConvertToStandardKernelLauncher!;
 
-		kernelLauncher(stream, 1, exponentBuffer.View, divisor, resultBuffer.View);			
+		kernelLauncher(stream, 1, exponentBuffer.View, divisor.Modulus, divisor.NPrime, divisor.MontgomeryOne, divisor.MontgomeryTwo, divisor.MontgomeryTwoSquared, resultBuffer.View);			
 
 		resultBuffer.View.CopyToCPU(stream, ref result, 1);
 		stream.Synchronize();
@@ -82,7 +82,7 @@ public static class Pow2MontgomeryGpuCalculator
 		
 		var accelerator = gpu.Accelerator;
 		var kernelLauncher = gpu.ConvertToStandardKernelLauncher;
-		kernelLauncher(stream, 1, exponentBuffer.View, divisor, resultBuffer.View);			
+		kernelLauncher(stream, 1, exponentBuffer.View, divisor.Modulus, divisor.NPrime, divisor.MontgomeryOne, divisor.MontgomeryTwo, divisor.MontgomeryTwoSquared, resultBuffer.View);			
 
 		resultBuffer.View.CopyToCPU(stream, ref result, 1);
 		stream.Synchronize();

PerfectNumbers.Core/Gpu/PrimeOrderGpuHeuristics.cs

@@ -398,14 +398,18 @@ internal static partial class PrimeOrderGpuHeuristics
 			statusBuffer.View);
 
 		var orderKernel = GetOrderKernel(acceleratorIndex);
-		var kernelLauncher = orderKernel.CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ulong, OrderKernelConfig, MontgomeryDivisorData, ArrayView1D<uint, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>, int, OrderKernelBuffers>>();
+		var kernelLauncher = orderKernel.CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ulong, OrderKernelConfig, ulong, ulong, ulong, ulong, ulong, ArrayView1D<uint, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>, int, OrderKernelBuffers>>();
 
 		kernelLauncher(
 			stream,
 			1,
 			prime,
 			kernelConfig,
-			divisorData,
+			divisorData.Modulus,
+			divisorData.NPrime,
+			divisorData.MontgomeryOne,
+			divisorData.MontgomeryTwo,
+			divisorData.MontgomeryTwoSquared,
 			smallPrimesView,
 			smallSquaresView,
 			(int)smallPrimesView.Length,
@@ -417,7 +421,7 @@ internal static partial class PrimeOrderGpuHeuristics
 		resultBuffer.View.CopyToCPU(stream, ref order, 1);
 		stream.Synchronize();
 
-		stream.Dispose();
+		AcceleratorStreamPool.Return(acceleratorIndex, stream);
 		phiFactorBuffer.Dispose();
 		phiExponentBuffer.Dispose();
 		workFactorBuffer.Dispose();
@@ -458,7 +462,7 @@ internal static partial class PrimeOrderGpuHeuristics
 		}
 
 		var accelerator = _accelerators[acceleratorIndex];
-		var loaded = accelerator.LoadAutoGroupedStreamKernel<Index1D, ulong, OrderKernelConfig, MontgomeryDivisorData, ArrayView1D<uint, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>, int, OrderKernelBuffers>(CalculateOrderKernel);
+		var loaded = accelerator.LoadAutoGroupedStreamKernel<Index1D, ulong, OrderKernelConfig, ulong, ulong, ulong, ulong, ulong, ArrayView1D<uint, Stride1D.Dense>, ArrayView1D<ulong, Stride1D.Dense>, int, OrderKernelBuffers>(CalculateOrderKernel);
 
 		var kernel = KernelUtil.GetKernel(loaded);
 		pool[acceleratorIndex] = kernel;
@@ -530,11 +534,12 @@ internal static partial class PrimeOrderGpuHeuristics
 		// remainderBuffer.MemSetToZero(stream);
 
 		var pow2ModKernel = GetPow2ModKernel(acceleratorIndex);
-		var kernelLauncher = pow2ModKernel.CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>>>();
+		var kernelLauncher = pow2ModKernel.CreateLauncherDelegate<Action<AcceleratorStream, Index1D, ArrayView1D<ulong, Stride1D.Dense>, ulong, ulong, ulong, ulong, ulong, ArrayView1D<ulong, Stride1D.Dense>>>();
 
 		try
 		{
-			kernelLauncher(stream, exponents.Length, exponentBuffer.View, divisorData, remainderBuffer.View);
+			kernelLauncher(stream, exponents.Length, exponentBuffer.View, divisorData.Modulus, divisorData.NPrime, divisorData.MontgomeryOne, divisorData.MontgomeryTwo, divisorData.MontgomeryTwoSquared, remainderBuffer.View);
+
 			remainderBuffer.View.CopyToCPU(stream, ref MemoryMarshal.GetReference(results), exponents.Length);
 			stream.Synchronize();
 
@@ -557,7 +562,7 @@ internal static partial class PrimeOrderGpuHeuristics
 		return true;
 	}
 
-	private static void ComputePow2ModCpu(ReadOnlySpan<ulong> exponents, ulong prime, in MontgomeryDivisorData divisorData, Span<ulong> results)
+	private static void ComputePow2ModCpu(ReadOnlySpan<ulong> exponents, ulong prime, in MontgomeryDivisorDataGpu divisorData, Span<ulong> results)
 	{
 		int length = exponents.Length;
 		for (int i = 0; i < length; i++)
@@ -636,7 +641,7 @@ internal static partial class PrimeOrderGpuHeuristics
 		}
 	}
 
-	private static ulong Pow2ModCpu(ulong exponent, ulong modulus, in MontgomeryDivisorData divisorData)
+	private static ulong Pow2ModCpu(ulong exponent, ulong modulus, in MontgomeryDivisorDataGpu divisorData)
 	{
 		if (modulus <= 1UL)
 		{
@@ -655,7 +660,7 @@ internal static partial class PrimeOrderGpuHeuristics
 		}
 
 		var accelerator = _accelerators[acceleratorIndex];
-		var loaded = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ArrayView1D<ulong, Stride1D.Dense>, MontgomeryDivisorData, ArrayView1D<ulong, Stride1D.Dense>>(Pow2ModKernel));
+		var loaded = KernelUtil.GetKernel(accelerator.LoadAutoGroupedStreamKernel<Index1D, ArrayView1D<ulong, Stride1D.Dense>, ulong, ulong, ulong, ulong, ulong, ArrayView1D<ulong, Stride1D.Dense>>(Pow2ModKernel));
 
 		pool[acceleratorIndex] = loaded;
 		return loaded;

PerfectNumbers.Core/HeuristicCombinedPrimeTester.cs

@@ -478,7 +478,7 @@ public sealed class HeuristicCombinedPrimeTester
 	internal static HeuristicDivisorPreparation PrepareHeuristicDivisor(in HeuristicDivisorCandidate candidate)
 	{
 		ulong divisor = candidate.Value;
-		MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(divisor);
+		MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(divisor);
 		bool hasCycleHint = TryGetCycleLengthHint(divisor, out ulong cycleLength);
 		return new(candidate, divisorData, cycleLength, hasCycleHint);
 	}

PerfectNumbers.Core/HeuristicPrimeTester.cs

@@ -445,7 +445,7 @@ public sealed class HeuristicPrimeTester
 	internal static HeuristicDivisorPreparation PrepareHeuristicDivisor(in HeuristicDivisorCandidate candidate)
 	{
 		ulong divisor = candidate.Value;
-		MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(divisor);
+		MontgomeryDivisorData divisorData = MontgomeryDivisorDataPool.Shared.FromModulus(divisor);
 		bool hasCycleHint = TryGetCycleLengthHint(divisor, out ulong cycleLength);
 		return new HeuristicDivisorPreparation(candidate, divisorData, cycleLength, hasCycleHint);
 	}

PerfectNumbers.Core/MersenneDivisorCycles.cs

@@ -222,8 +222,10 @@ public class MersenneDivisorCycles
 		if (divisor <= ulong.MaxValue)
 		{
 			ulong divisor64 = (ulong)divisor;
-			MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(divisor64);
+			Queue<MontgomeryDivisorData> divisorPool = MontgomeryDivisorDataPool.Shared;
+			MontgomeryDivisorData divisorData = divisorPool.FromModulus(divisor64);
 			ulong cycle = CalculateCycleLength(divisor64, divisorData);
+			divisorPool.Return(divisorData);
 			return (UInt128)cycle;
 		}
 
@@ -733,6 +735,7 @@ public class MersenneDivisorCycles
 
 			ulong localStart = threadStart;
 			ulong localEnd = threadEnd;
+			Queue<MontgomeryDivisorData> divisorPool = MontgomeryDivisorDataPool.Shared;
 			tasks[taskIndex] = Task.Run(() =>
 			{
 				ulong rangeLength = localEnd - localStart + 1UL;
@@ -758,8 +761,9 @@ public class MersenneDivisorCycles
 					// TODO: Migrate this generation path to the shared
 					// unrolled-hex calculator so the CPU generator matches
 					// the GPU benchmark leader for large divisors.
-					MontgomeryDivisorData divisorData = MontgomeryDivisorData.FromModulus(divisor);
+					MontgomeryDivisorData divisorData = divisorPool.FromModulus(divisor);
 					ulong cycle = CalculateCycleLength(divisor, divisorData);
+					divisorPool.Return(divisorData);
 					localCycles[localCycleIndex++] = (divisor, cycle);
 				}
 

PerfectNumbers.Core/MontgomeryDivisorData.cs

@@ -1,47 +1,24 @@
-using System.Runtime.CompilerServices;
-
 namespace PerfectNumbers.Core;
 
-public readonly struct MontgomeryDivisorData(ulong modulus, ulong nPrime, ulong montgomeryOne, ulong montgomeryTwo, ulong montgomeryTwoSquared)
+public sealed class MontgomeryDivisorData
 {
-    public readonly ulong Modulus = modulus;
+	public static readonly MontgomeryDivisorData Empty = new();
+    public ulong Modulus;
+	public ulong NPrime;
+	public ulong MontgomeryOne;
+	public ulong MontgomeryTwo;
+	public ulong MontgomeryTwoSquared;
 
-    public readonly ulong NPrime = nPrime;
-
-    public readonly ulong MontgomeryOne = montgomeryOne;
-
-    public readonly ulong MontgomeryTwo = montgomeryTwo;
-    public readonly ulong MontgomeryTwoSquared = montgomeryTwoSquared;
-
-    [MethodImpl(MethodImplOptions.AggressiveInlining)]
-    private static ulong ComputeMontgomeryResidue(UInt128 value, ulong modulus) => (ulong)(value % modulus);
-
-    private static ulong ComputeMontgomeryNPrime(ulong modulus)
-    {
-        ulong inv = modulus;
-        inv *= unchecked(2UL - modulus * inv);
-        inv *= unchecked(2UL - modulus * inv);
-        inv *= unchecked(2UL - modulus * inv);
-        inv *= unchecked(2UL - modulus * inv);
-        inv *= unchecked(2UL - modulus * inv);
-        inv *= unchecked(2UL - modulus * inv);
-        inv *= unchecked(2UL - modulus * inv);
-        return unchecked(0UL - inv);
-    }
-
-    public static MontgomeryDivisorData FromModulus(ulong modulus)
-    {
-        ulong nPrime = ComputeMontgomeryNPrime(modulus);
-        ulong montgomeryOne = ComputeMontgomeryResidue(UInt128Numbers.OneShiftedLeft64, modulus);
-        ulong montgomeryTwo = ComputeMontgomeryResidue(UInt128Numbers.OneShiftedLeft64x2, modulus);
-        ulong montgomeryTwoSquared = ULongExtensions.MontgomeryMultiplyCpu(montgomeryTwo, montgomeryTwo, modulus, nPrime);
-
-        return new MontgomeryDivisorData(
-            modulus,
-            nPrime,
-            montgomeryOne,
-            montgomeryTwo,
-            montgomeryTwoSquared);
-    }
+	public MontgomeryDivisorData()
+	{	
+	}
 
+	public MontgomeryDivisorData(ulong modulus, ulong nPrime, ulong montgomeryOne, ulong montgomeryTwo, ulong montgomeryTwoSquared)
+	{
+		Modulus = modulus;
+		NPrime = nPrime;
+		MontgomeryOne = montgomeryOne;
+		MontgomeryTwo = montgomeryTwo;
+		MontgomeryTwoSquared = montgomeryTwoSquared;
+	}
 }

PerfectNumbers.Core/MontgomeryDivisorDataPool.cs

@@ -0,0 +1,80 @@
+using System.Runtime.CompilerServices;
+
+namespace PerfectNumbers.Core;
+
+public static class MontgomeryDivisorDataPool
+{
+	[ThreadStatic]
+	private static Queue<MontgomeryDivisorData>? _pool;
+	public static Queue<MontgomeryDivisorData> Shared => _pool ??= new();
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private static ulong ComputeMontgomeryResidue(UInt128 value, ulong modulus) => (ulong)(value % modulus);
+
+    private static ulong ComputeMontgomeryNPrime(ulong modulus)
+    {
+        ulong inv = modulus;
+        inv *= unchecked(2UL - modulus * inv);
+        inv *= unchecked(2UL - modulus * inv);
+        inv *= unchecked(2UL - modulus * inv);
+        inv *= unchecked(2UL - modulus * inv);
+        inv *= unchecked(2UL - modulus * inv);
+        inv *= unchecked(2UL - modulus * inv);
+        inv *= unchecked(2UL - modulus * inv);
+        return unchecked(0UL - inv);
+    }
+	
+	public static MontgomeryDivisorData Rent(ulong modulus, ulong nPrime, ulong montgomeryOne, ulong montgomeryTwo, ulong montgomeryTwoSquared)
+	{
+		var pool = _pool ??= new();
+		if (pool.TryDequeue(out var pooled))
+		{
+			pooled.Modulus = modulus;
+			pooled.NPrime = nPrime;
+			pooled.MontgomeryOne = montgomeryOne;
+			pooled.MontgomeryTwo = montgomeryTwo;
+			pooled.MontgomeryTwoSquared = montgomeryTwoSquared;
+			return pooled;
+		}
+
+		return new(modulus, nPrime, montgomeryOne, montgomeryTwo, montgomeryTwoSquared);
+	}
+
+	[MethodImpl(MethodImplOptions.AggressiveInlining)]
+	public static void Return(MontgomeryDivisorData divisorData) => _pool!.Enqueue(divisorData);
+	
+
+	[MethodImpl(MethodImplOptions.AggressiveInlining)]
+    public static MontgomeryDivisorData FromModulus(this Queue<MontgomeryDivisorData> queue, ulong modulus)
+    {
+        ulong nPrime = ComputeMontgomeryNPrime(modulus);
+        ulong montgomeryOne = ComputeMontgomeryResidue(UInt128Numbers.OneShiftedLeft64, modulus);
+        ulong montgomeryTwo = ComputeMontgomeryResidue(UInt128Numbers.OneShiftedLeft64x2, modulus);
+        ulong montgomeryTwoSquared = ULongExtensions.MontgomeryMultiplyCpu(montgomeryTwo, montgomeryTwo, modulus, nPrime);
+
+        return queue.Rent(
+            modulus,
+            nPrime,
+            montgomeryOne,
+            montgomeryTwo,
+            montgomeryTwoSquared);
+    }
+
+	public static MontgomeryDivisorData Rent(this Queue<MontgomeryDivisorData> queue, ulong modulus, ulong nPrime, ulong montgomeryOne, ulong montgomeryTwo, ulong montgomeryTwoSquared)
+	{
+		if (queue.TryDequeue(out var pooled))
+		{
+			pooled.Modulus = modulus;
+			pooled.NPrime = nPrime;
+			pooled.MontgomeryOne = montgomeryOne;
+			pooled.MontgomeryTwo = montgomeryTwo;
+			pooled.MontgomeryTwoSquared = montgomeryTwoSquared;
+			return pooled;
+		}
+
+		return new(modulus, nPrime, montgomeryOne, montgomeryTwo, montgomeryTwoSquared);
+	}
+
+	[MethodImpl(MethodImplOptions.AggressiveInlining)]
+	public static void Return(this Queue<MontgomeryDivisorData> queue, MontgomeryDivisorData divisorData) => queue.Enqueue(divisorData);
+}

PerfectNumbers.Core/PerfectNumberConstants.cs

@@ -8,7 +8,7 @@ public static class PerfectNumberConstants
 	public const int DefaultSmallPrimeFactorSlotCount = 64;
 	public const int DefaultSpecialMaxFactorCapacity = 1024;
     public const ulong ExtraDivisorCycleSearchLimit = 64UL;
-	public const int GpuFrequency = 16 - 1;
+	public const int GpuFrequency = 4 - 1;
     public const int MaxQForDivisorCycles = 4_000_000;
     public static readonly uint PrimesLimit = 1_000_000; //(ulong)Array.MaxLength;// 1_000_000;
     public const int MaxOddPowersCount = 128;

PerfectNumbers.Core/PrimeOrderCalculator.Cpu.cs

@@ -1389,7 +1389,7 @@ internal static partial class PrimeOrderCalculator
 	private static bool RunOnGpu()
 	{
 		// return false;
-		// return true;
+		return true;
 		// int cpuCount;
 		
 		// lock(_sync)

PerfectNumbers.Core/PrimeOrderCalculator.Gpu.cs

@@ -44,7 +44,7 @@ internal static partial class PrimeOrderCalculator
 
 		// var kernelLauncher = gpu.CheckFactorsKernelLauncher;		
 		var kernel = gpu.CheckFactorsKernel;
-		kernel.Launch(stream, 1, entryCount, phi, gpu.Pow2ModEntriesToTestOnDevice.View, divisorData, gpu.OutputUlong.View);
+		kernel.Launch(stream, 1, entryCount, phi, gpu.Pow2ModEntriesToTestOnDevice.View, divisorData.Modulus, divisorData.NPrime, divisorData.MontgomeryOne, divisorData.MontgomeryTwo, divisorData.MontgomeryTwoSquared, gpu.OutputUlong.View);
 
 		gpu.OutputUlong.View.CopyToCPU(stream, ref order, 1);
 		stream.Synchronize();
@@ -146,7 +146,7 @@ internal static partial class PrimeOrderCalculator
 				phi,
 				specialMaxFactorsView,
 				factorCount,
-				divisorData,
+				divisorData.Modulus,
 				gpu.OutputUlong.View,
 				specialMaxResultView);
 

PerfectNumbers.Core/PrimeOrderCalculator.Shared.cs

@@ -82,7 +82,7 @@ internal static partial class PrimeOrderCalculator
                         Console.WriteLine(messageFactory());
                 }
         }
-    private static UInt128 CalculateWideInternal(in UInt128 prime, in UInt128? previousOrder, in MontgomeryDivisorData divisorData, in PrimeOrderSearchConfig config)
+    private static UInt128 CalculateWideInternal(in UInt128 prime, in UInt128? previousOrder, in MontgomeryDivisorData? divisorData, in PrimeOrderSearchConfig config)
     {
         if (prime <= UInt128.One)
         {

PerfectNumbers.Core/PrimeOrderCalculator.cs

@@ -86,13 +86,15 @@ internal static partial class PrimeOrderCalculator
 			}
 
 			ulong prime64 = (ulong)prime;
-			divisorData = MontgomeryDivisorData.FromModulus(prime64);
+			Queue<MontgomeryDivisorData> divisorPool = MontgomeryDivisorDataPool.Shared;
+			divisorData = divisorPool.FromModulus(prime64);
 			ulong order64 = Calculate(prime64, previous, divisorData, config, device);
+			divisorPool.Return(divisorData);
 			result = order64 == 0UL ? UInt128.Zero : (UInt128)order64;
 		}
 		else
 		{
-			divisorData = default;
+			divisorData = MontgomeryDivisorData.Empty;
 			result = CalculateWideInternal(prime, previousOrder, divisorData, config);
 		}
 

PerfectNumbers.Core/ULongExtensions.Gpu.cs

@@ -229,13 +229,13 @@ public static partial class ULongExtensions
 	}
 
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
-	internal static ulong Pow2MontgomeryModWindowedGpuKeepMontgomery(in MontgomeryDivisorData divisor, ulong exponent)
+	internal static ulong Pow2MontgomeryModWindowedGpuKeepMontgomery(in MontgomeryDivisorDataGpu divisor, ulong exponent)
 	{
 		return Pow2MontgomeryModWindowedGpuMontgomeryResult(divisor, exponent);
 	}
 
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
-	internal static ulong Pow2MontgomeryModWindowedGpuConvertToStandard(in MontgomeryDivisorData divisor, ulong exponent)
+	internal static ulong Pow2MontgomeryModWindowedGpuConvertToStandard(in MontgomeryDivisorDataGpu divisor, ulong exponent)
 	{
 		ulong modulus = divisor.Modulus;
 		ulong nPrime = divisor.NPrime;
@@ -244,7 +244,7 @@ public static partial class ULongExtensions
 	}
 
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
-	private static ulong Pow2MontgomeryModWindowedGpuMontgomeryResult(in MontgomeryDivisorData divisor, ulong exponent)
+	private static ulong Pow2MontgomeryModWindowedGpuMontgomeryResult(in MontgomeryDivisorDataGpu divisor, ulong exponent)
 	{
 		ulong modulus = divisor.Modulus;
 		// Reuse the GPU-compatible MontgomeryMultiply helper highlighted in MontgomeryMultiplyBenchmarks so the accelerator path
@@ -349,7 +349,7 @@ public static partial class ULongExtensions
 	}
 
 	[MethodImpl(MethodImplOptions.AggressiveInlining)]
-	private static ulong ComputeMontgomeryOddPowerGpu(ulong exponent, in MontgomeryDivisorData divisor, ulong modulus, ulong nPrime)
+	private static ulong ComputeMontgomeryOddPowerGpu(ulong exponent, in MontgomeryDivisorDataGpu divisor, ulong modulus, ulong nPrime)
 	{
 		ulong baseValue = divisor.MontgomeryTwo;
 		ulong power = divisor.MontgomeryOne;