Use GpuPrimeWorkLimiter for GPU lease limiting

EvenPerfectBitScanner/Program.cs

@@ -61,7 +61,7 @@ internal static class Program
 			int gpuPrimeThreads = Math.Max(1, _cliArguments.GpuPrimeThreads);
 			UnboundedTaskScheduler.ConfigureThreadCount(threadCount);
 			PrimeTester.GpuBatchSize = gpuPrimeBatch;
-			GpuPrimeLeaseLimiter.Initialize(gpuPrimeThreads);
+			GpuPrimeWorkLimiter.SetLimit(gpuPrimeThreads);
 			GpuContextPool.WarmUpPool(threadCount);
 			PrimeTester.WarmUpGpuKernels(gpuPrimeThreads);
 			Console.WriteLine("Starting up threads...");
@@ -118,9 +118,6 @@ internal static class Program
 				return;
 			}
 
-			// Apply GPU prime sieve runtime configuration
-			GpuPrimeWorkLimiter.SetLimit(gpuPrimeThreads);
-			PrimeTester.GpuBatchSize = gpuPrimeBatch;
 
 			MersenneDivisorCycles mersenneDivisorCycles = new();
 			if (!File.Exists(cyclesPath) || continueCyclesGeneration)

PerfectNumbers.Core/Gpu/GpuContextPool.cs

@@ -49,10 +49,6 @@ public static class GpuContextPool
 
 	// Allows callers to choose CPU/GPU per use-case, decoupled from ForceCpu.
         	public static GpuContextLease Rent()
-	{
-		GpuPrimeLeaseLimiter.Enter();
-
-		try
 	{
 		if (GpuPool.TryDequeue(out var gpu))
 		{
@@ -62,12 +58,7 @@ public static class GpuContextPool
 		// Create a new accelerator when the pool does not have one available.
 		return new GpuContextLease(new PooledContext());
 	}
-		catch
+
-		{
-			GpuPrimeLeaseLimiter.Exit();
-			throw;
-		}
-	}
 
 	public static void WarmUpPool(int threadCount)
 	{
@@ -106,7 +97,6 @@ public static class GpuContextPool
 	{
 		ctx.Accelerator.Synchronize();
 		GpuPool.Enqueue(ctx);
-		GpuPrimeLeaseLimiter.Exit();
 	}
 
 	public struct GpuContextLease

PerfectNumbers.Core/Gpu/GpuPrimeLeaseLimiter.cs

@@ -1,37 +0,0 @@
-using System.Threading;
-
-namespace PerfectNumbers.Core.Gpu;
-
-public static class GpuPrimeLeaseLimiter
-{
-        private static SemaphoreSlim _semaphore = new(int.MaxValue, int.MaxValue);
-        private static int _currentLimit = int.MaxValue;
-
-        public static void Initialize(int limit)
-        {
-                if (limit <= 0)
-                {
-                        limit = 1;
-                }
-
-                if (limit == _currentLimit)
-                {
-                        return;
-                }
-
-                var previous = _semaphore;
-                _semaphore = new SemaphoreSlim(limit, limit);
-                _currentLimit = limit;
-                previous.Dispose();
-        }
-
-        public static void Enter()
-        {
-                _semaphore.Wait();
-        }
-
-        public static void Exit()
-        {
-                _semaphore.Release();
-        }
-}

PerfectNumbers.Core/Gpu/GpuPrimeWorkLimiter.cs

@@ -1,3 +1,6 @@
+using System;
+using System.Threading;
+
 namespace PerfectNumbers.Core.Gpu;
 
 public static class GpuPrimeWorkLimiter
@@ -10,12 +13,17 @@ public static class GpuPrimeWorkLimiter
         // TODO: Inline the pooled limiter guard from the GpuLimiterThroughputBenchmarks so prime-sieve
         // GPU jobs stop allocating Lease instances on every acquisition.
         var sem = _semaphore;
-        // sem.Wait();
+        sem.Wait();
         return new Lease(sem);
     }
 
     public static void SetLimit(int value)
     {
+        if (value <= 0)
+        {
+            value = 1;
+        }
+
         if (value == _currentLimit)
         {
             return;
@@ -23,11 +31,13 @@ public static class GpuPrimeWorkLimiter
 
         // TODO: Switch to a shared limiter implementation with GpuWorkLimiter so we can coordinate CPU/GPU prime work using
         // the same semaphore pool without reallocating per adjustment.
+        var previous = _semaphore;
         _semaphore = new SemaphoreSlim(value, value);
         _currentLimit = value;
+        previous.Dispose();
     }
 
-    public sealed class Lease
+    public sealed class Lease : IDisposable
     {
         private readonly SemaphoreSlim _sem;
 
@@ -38,8 +48,7 @@ public static class GpuPrimeWorkLimiter
 
         public void Dispose()
         {
-            // _sem.Release();
+            _sem.Release();
         }
     }
 }
-

PerfectNumbers.Core/PrimeTester.cs

@@ -283,10 +283,6 @@ public sealed class PrimeTester
 		}
 
                 internal static PrimeTesterGpuContextLease Rent(int minBufferCapacity = 1)
-		{
-			GpuPrimeLeaseLimiter.Enter();
-
-			try
                 {
                         if (!Pool.TryDequeue(out var lease))
                         {
@@ -300,18 +296,12 @@ public sealed class PrimeTester
                         lease.ResetReturnFlag();
                         return lease;
                 }
-			catch
+
-			{
-				GpuPrimeLeaseLimiter.Exit();
-				throw;
-			}
-		}
 
 		internal static void Return(PrimeTesterGpuContextLease lease)
 		{
 			lease.Accelerator.Synchronize();
 			Pool.Enqueue(lease);
-			GpuPrimeLeaseLimiter.Exit();
 		}
 
 		internal static void DisposeAll()