Add cycle cache hit tracking instrumentation

PerfectNumbers.Core/Cpu/MersenneNumberDivisorByDivisorCpuTester.cs

@@ -12,12 +12,6 @@ public sealed class MersenneNumberDivisorByDivisorCpuTester : IMersenneNumberDiv
     private ulong _lastStatusDivisor;
     private int _batchSize = 1_024;
 
-    private const int FactorCachePrimeTrackingLimit = 500_000;
-    private static readonly HashSet<ulong> FactorCacheTrackedPrimes = new();
-    private static readonly object FactorCachePrimeLock = new();
-    private static ulong FactorCachePrimeHitCount;
-    private static bool FactorCachePrimeTrackingDisabled;
-
     [ThreadStatic]
     private static GpuUInt128WorkSet _divisorScanGpuWorkSet;
 
@@ -122,8 +116,6 @@ public sealed class MersenneNumberDivisorByDivisorCpuTester : IMersenneNumberDiv
         processedCount = 0UL;
         processedAll = false;
 
-        ObserveFactorCachePrime(prime);
-
         // The EvenPerfectBitScanner feeds primes >= 138,000,000 here, so allowedMax >= 3 in production runs.
         // Keeping the guard commented out documents the reasoning for benchmarks and tests.
         // if (allowedMax < 3UL)
@@ -263,43 +255,6 @@ public sealed class MersenneNumberDivisorByDivisorCpuTester : IMersenneNumberDiv
         return false;
     }
 
-    private static void ObserveFactorCachePrime(ulong prime)
-    {
-        bool logHit = false;
-        ulong hitNumber = 0UL;
-        bool trackingDisabledNow = false;
-
-        lock (FactorCachePrimeLock)
-        {
-            if (FactorCachePrimeTrackingDisabled)
-            {
-                return;
-            }
-
-            if (!FactorCacheTrackedPrimes.Add(prime))
-            {
-                FactorCachePrimeHitCount++;
-                hitNumber = FactorCachePrimeHitCount;
-                logHit = true;
-            }
-            else if (FactorCacheTrackedPrimes.Count >= FactorCachePrimeTrackingLimit)
-            {
-                FactorCachePrimeTrackingDisabled = true;
-                FactorCacheTrackedPrimes.Clear();
-                trackingDisabledNow = true;
-            }
-        }
-
-        if (logHit)
-        {
-            Console.WriteLine($"Factor cache hit for exponent {prime} ({hitNumber})");
-        }
-        else if (trackingDisabledNow)
-        {
-            Console.WriteLine("Factor cache hit tracking disabled after exceeding the tracking limit.");
-        }
-    }
-
     private static byte CheckDivisor(ulong prime, ulong divisorCycle, in MontgomeryDivisorData divisorData)
     {
         ulong residue = prime.Pow2MontgomeryModWithCycleCpu(divisorCycle, divisorData);