Hybrid device mode implemented as the current --mersenne=bydivisor CPU execution path. CPU path is now limited to CPU calculations, only.

PerfectNumbers.Core/Gpu/MersenneNumberResidueGpuTester.cs

@@ -2,6 +2,7 @@ using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
 using ILGPU;
 using ILGPU.Runtime;
+using PerfectNumbers.Core.Gpu.Accelerators;
 
 namespace PerfectNumbers.Core.Gpu;
 
@@ -21,18 +22,16 @@ public class MersenneNumberResidueGpuTester(bool useGpuOrder)
 	// TODO: When cycles are missing for larger q values, compute only the single required cycle on the device
 	// requested by the caller, skip queuing additional block generation, and keep the snapshot cache untouched.
 
-	private static readonly Accelerator[] _accelerators = AcceleratorPool.Shared.Accelerators;
-
 	// GPU residue variant: check 2^p % q == 1 for q = 2*p*k + 1.
-	public void Scan(ulong exponent, UInt128 twoP, LastDigit lastDigit, UInt128 maxK, ref bool isPrime)
+	public void Scan(PrimeOrderCalculatorAccelerator gpu, ulong exponent, UInt128 twoP, LastDigit lastDigit, UInt128 maxK, ref bool isPrime)
 	{
 		// GpuPrimeWorkLimiter.Acquire();
-		var acceleratorIndex = AcceleratorPool.Shared.Rent();
-		var accelerator = _accelerators[acceleratorIndex];
+		var acceleratorIndex = gpu.AcceleratorIndex;
+		var accelerator = gpu.Accelerator;
 
 		// Monitor.Enter(gpuLease.ExecutionLock);
 
-		var stream = accelerator.CreateStream();
+		var stream = AcceleratorStreamPool.Rent(acceleratorIndex);
 		var kernel = GetPow2ModKernel(accelerator);
 		var resources = RentResources(accelerator, GpuConstants.ScanBatchSize);
 		var gpuKernels = GpuKernelPool.GetOrAddKernels(acceleratorIndex, stream, KernelType.SmallCycles | KernelType.SmallPrimes);
@@ -109,7 +108,7 @@ public class MersenneNumberResidueGpuTester(bool useGpuOrder)
 		}
 
 		ReturnResources(resources);
-		stream.Dispose();
+		AcceleratorStreamPool.Return(acceleratorIndex, stream);
 		// Monitor.Exit(gpuLease.ExecutionLock);
 		gpuKernels.Dispose();
 		// GpuPrimeWorkLimiter.Release();