Various optimizations to separate non-static data between threads and resolve read/write access issue.

PerfectNumbers.Core/HeuristicCombinedPrimeTester.cs

@@ -2,6 +2,7 @@ using Open.Numeric.Primes;
 using ILGPU.Runtime;
 using System.Runtime.CompilerServices;
 using PerfectNumbers.Core.Gpu;
+using System.Runtime.InteropServices;
 
 namespace PerfectNumbers.Core;
 
@@ -227,6 +228,7 @@ public sealed class HeuristicCombinedPrimeTester
 		GpuPrimeWorkLimiter.Acquire();
 		var gpu = PrimeTester.PrimeTesterGpuContextPool.Rent(1);
 		var accelerator = gpu.Accelerator;
+		var stream = gpu.Stream;
 		var kernel = PrimeTester.PrimeTesterGpuContextPool.PrimeTesterGpuContextLease.HeuristicTrialDivisionKernel;
 		var flagView1D = gpu.HeuristicFlag.View;
 		var flagView = flagView1D.AsContiguous();
@@ -243,8 +245,9 @@ public sealed class HeuristicCombinedPrimeTester
 				maxDivisorSquare,
 				HeuristicGpuDivisorTableKind.Combined,
 				gpu.HeuristicGpuTables);
-		accelerator.Synchronize();
-		flagView1D.CopyToCPU(ref compositeFlag, 1);
+		stream.Synchronize();
+
+		flagView1D.CopyToCPU(stream, ref compositeFlag, 1);
 		compositeDetected = compositeFlag != 0;
 
 		gpu.Dispose();