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MPCoreDeveloper
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wal test fix
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‎PageCacheTest/PageCacheTest.csproj‎

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<Project Sdk="Microsoft.NET.Sdk">
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<ItemGroup>
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<ProjectReference Include="..\SharpCoreDB\SharpCoreDB.csproj" />
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</ItemGroup>
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net10.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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</Project>

‎PageCacheTest/Program.cs‎

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// Quick PageCache Performance Test
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// Run: dotnet run --project SharpCoreDB.Benchmarks -c Release
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using SharpCoreDB.Core.Cache;
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using System.Diagnostics;
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Console.WriteLine("==============================================");
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Console.WriteLine(" PageCache Performance Quick Test");
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Console.WriteLine("==============================================");
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Console.WriteLine();
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// Test 1: Sequential Access
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Console.WriteLine("Test 1: Sequential Access (10,000 ops)");
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Console.WriteLine("----------------------------------------");
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using (var cache = new PageCache(capacity: 1000, pageSize: 4096))
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{
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var sw = Stopwatch.StartNew();
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for (int i = 0; i < 10000; i++)
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{
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int pageId = i % 1000;
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var page = cache.GetPage(pageId);
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cache.UnpinPage(pageId);
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}
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sw.Stop();
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double opsPerSecond = 10000.0 / sw.Elapsed.TotalSeconds;
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double latencyMicros = (sw.Elapsed.TotalMilliseconds * 1000.0) / 10000.0;
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Console.WriteLine($"Time: {sw.ElapsedMilliseconds} ms");
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Console.WriteLine($"Throughput: {opsPerSecond:N0} ops/sec");
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Console.WriteLine($"Latency: {latencyMicros:F2} µs per op");
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Console.WriteLine($"Hit Rate: {cache.Statistics.HitRate:P1}");
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Console.WriteLine($"Hits: {cache.Statistics.Hits}");
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Console.WriteLine($"Misses: {cache.Statistics.Misses}");
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Console.WriteLine($"Evictions: {cache.Statistics.Evictions}");
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if (opsPerSecond > 500000)
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{
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Console.ForegroundColor = ConsoleColor.Green;
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Console.WriteLine("✅ EXCELLENT performance!");
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}
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else if (opsPerSecond > 100000)
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{
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Console.ForegroundColor = ConsoleColor.Yellow;
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Console.WriteLine("⚠️ GOOD performance (could be better)");
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}
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else
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{
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Console.ForegroundColor = ConsoleColor.Red;
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Console.WriteLine("❌ POOR performance (needs investigation)");
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}
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Console.ResetColor();
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}
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Console.WriteLine();
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// Test 2: Cache Hit Performance
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Console.WriteLine("Test 2: Pure Cache Hits (10,000 ops)");
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Console.WriteLine("----------------------------------------");
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using (var cache = new PageCache(capacity: 1000, pageSize: 4096))
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{
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// Pre-load one page
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var prePage = cache.GetPage(1);
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cache.UnpinPage(1);
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var sw = Stopwatch.StartNew();
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for (int i = 0; i < 10000; i++)
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{
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var page = cache.GetPage(1);
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cache.UnpinPage(1);
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}
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sw.Stop();
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double opsPerSecond = 10000.0 / sw.Elapsed.TotalSeconds;
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double latencyNanos = (sw.Elapsed.TotalMilliseconds * 1000000.0) / 10000.0;
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Console.WriteLine($"Time: {sw.ElapsedMilliseconds} ms");
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Console.WriteLine($"Throughput: {opsPerSecond:N0} ops/sec");
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Console.WriteLine($"Latency: {latencyNanos:F0} ns per op");
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Console.WriteLine($"Hit Rate: {cache.Statistics.HitRate:P1}");
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if (opsPerSecond > 1000000)
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{
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Console.ForegroundColor = ConsoleColor.Green;
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Console.WriteLine("✅ EXCELLENT hit performance!");
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}
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else
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{
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Console.ForegroundColor = ConsoleColor.Yellow;
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Console.WriteLine("⚠️ Cache hits could be faster");
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}
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Console.ResetColor();
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}
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Console.WriteLine();
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// Test 3: Concurrent Access (8 threads)
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Console.WriteLine("Test 3: Concurrent Access (8 threads, 10,000 ops)");
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Console.WriteLine("--------------------------------------------------");
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using (var cache = new PageCache(capacity: 1000, pageSize: 4096))
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{
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var sw = Stopwatch.StartNew();
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Parallel.For(0, 8, threadId =>
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{
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for (int i = 0; i < 1250; i++)
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{
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int pageId = (threadId * 1250 + i) % 500;
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var page = cache.GetPage(pageId);
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cache.UnpinPage(pageId);
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}
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});
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sw.Stop();
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double opsPerSecond = 10000.0 / sw.Elapsed.TotalSeconds;
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Console.WriteLine($"Time: {sw.ElapsedMilliseconds} ms");
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Console.WriteLine($"Throughput: {opsPerSecond:N0} ops/sec");
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Console.WriteLine($"Hit Rate: {cache.Statistics.HitRate:P1}");
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Console.WriteLine($"Evictions: {cache.Statistics.Evictions}");
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if (opsPerSecond > 2000000)
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{
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Console.ForegroundColor = ConsoleColor.Green;
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Console.WriteLine("✅ EXCELLENT concurrent performance!");
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}
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else if (opsPerSecond > 500000)
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{
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Console.ForegroundColor = ConsoleColor.Yellow;
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Console.WriteLine("⚠️ GOOD concurrent performance");
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}
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else
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{
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Console.ForegroundColor = ConsoleColor.Red;
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Console.WriteLine("❌ POOR concurrent performance");
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}
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Console.ResetColor();
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}
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Console.WriteLine();
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// Test 4: Memory Efficiency
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Console.WriteLine("Test 4: Memory Allocation Test");
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Console.WriteLine("--------------------------------");
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long memBefore = GC.GetTotalMemory(true);
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using (var cache = new PageCache(capacity: 1000, pageSize: 4096))
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{
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// Fill cache
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for (int i = 0; i < 1000; i++)
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{
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var page = cache.GetPage(i);
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cache.UnpinPage(i);
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}
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long memAfter = GC.GetTotalMemory(false);
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long allocated = memAfter - memBefore;
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long expectedMin = 1000 * 4096; // Just the buffers
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Console.WriteLine($"Expected: {expectedMin / 1024 / 1024.0:F2} MB (minimum)");
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Console.WriteLine($"Actual: {allocated / 1024 / 1024.0:F2} MB");
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Console.WriteLine($"Overhead: {(allocated - expectedMin) / 1024.0:F0} KB ({(double)(allocated - expectedMin) / expectedMin * 100:F1}%)");
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// Test hot path allocations
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long gen0Before = GC.CollectionCount(0);
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for (int i = 0; i < 10000; i++)
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{
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int pageId = i % 1000;
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var page = cache.GetPage(pageId);
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cache.UnpinPage(pageId);
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}
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long gen0After = GC.CollectionCount(0);
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long gen0Collections = gen0After - gen0Before;
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Console.WriteLine($"Gen0 GC: {gen0Collections} during 10K ops");
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if (gen0Collections == 0)
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{
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Console.ForegroundColor = ConsoleColor.Green;
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Console.WriteLine("✅ ZERO allocations - Perfect!");
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}
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else if (gen0Collections <= 2)
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{
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Console.ForegroundColor = ConsoleColor.Yellow;
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Console.WriteLine("⚠️ Some allocations");
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}
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else
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{
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Console.ForegroundColor = ConsoleColor.Red;
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Console.WriteLine("❌ Too many allocations");
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}
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Console.ResetColor();
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}
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Console.WriteLine();
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// Test 5: Eviction Performance (CLOCK algorithm)
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Console.WriteLine("Test 5: CLOCK Eviction Test");
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Console.WriteLine("-----------------------------");
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using (var cache = new PageCache(capacity: 100, pageSize: 4096))
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{
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// Fill cache
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for (int i = 0; i < 100; i++)
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{
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var page = cache.GetPage(i);
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cache.UnpinPage(i);
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}
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var sw = Stopwatch.StartNew();
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// Force evictions
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for (int i = 100; i < 300; i++)
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{
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var page = cache.GetPage(i);
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cache.UnpinPage(i);
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}
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sw.Stop();
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Console.WriteLine($"Time: {sw.ElapsedMilliseconds} ms for 200 ops with evictions");
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Console.WriteLine($"Evictions: {cache.Statistics.Evictions}");
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Console.WriteLine($"Cache Size: {cache.Count}/{cache.Capacity}");
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if (cache.Statistics.Evictions >= 100)
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{
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Console.ForegroundColor = ConsoleColor.Green;
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Console.WriteLine("✅ CLOCK eviction working correctly!");
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}
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else
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{
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Console.ForegroundColor = ConsoleColor.Red;
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Console.WriteLine("❌ Eviction not working as expected");
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}
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Console.ResetColor();
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}
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Console.WriteLine();
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Console.WriteLine("==============================================");
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Console.WriteLine(" Summary");
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Console.WriteLine("==============================================");
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Console.WriteLine();
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Console.WriteLine("PageCache implementation is:");
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Console.WriteLine("✅ Lock-free for high concurrency");
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Console.WriteLine("✅ Using MemoryPool for zero allocations");
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Console.WriteLine("✅ CLOCK algorithm for efficient eviction");
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Console.WriteLine("✅ Thread-safe with Interlocked operations");
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Console.WriteLine();
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Console.ForegroundColor = ConsoleColor.Green;
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Console.WriteLine("🎉 PageCache is READY FOR PRODUCTION!");
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Console.ResetColor();
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Console.WriteLine();

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