GpuContextPool removed, because we share context and accelerator between threads, using streams to separate.

PerfectNumbers.Core/Gpu/MersenneNumberIncrementalGpuTester.cs

@@ -17,7 +17,7 @@ public class MersenneNumberIncrementalGpuTester(GpuKernelType kernelType, bool u
         throw new NotImplementedException($"GPU incremental scanning requires the device cycle heuristics implementation (kernel: {_kernelType}, GPU order: {_useGpuOrder}).");
 
         var gpuLease = GpuKernelPool.Rent();
-        var accelerator = gpuLease.Accelerator;
+        var accelerator = SharedGpuContext.Accelerator;
         var stream = gpuLease.Stream;
         int batchSize = GpuConstants.ScanBatchSize; // large batch improves GPU occupancy
         UInt128 kStart = 1UL;
@@ -31,11 +31,11 @@ public class MersenneNumberIncrementalGpuTester(GpuKernelType kernelType, bool u
         ulong step3 = ((exponent % 3UL) << 1) % 3UL;
         ulong step5 = ((exponent % 5UL) << 1) % 5UL;
         GpuUInt128 twoPGpu = (GpuUInt128)twoP;
-        var smallCyclesView = GpuKernelPool.EnsureSmallCyclesOnDevice(gpuLease.Kernels, accelerator, stream);
+        var smallCyclesView = GpuKernelPool.GetSmallCyclesOnDevice();
         ResiduePrimeViews primeViews = default;
         if (_kernelType == GpuKernelType.Pow2Mod)
         {
-            primeViews = GpuKernelPool.EnsureSmallPrimesOnDevice(gpuLease.Kernels, accelerator, stream);
+            primeViews = GpuKernelPool.GetSmallPrimesOnDevice();
         }
 
         var orderBuffer = accelerator.Allocate1D<ulong>(batchSize);