71 lines
1.8 KiB
C#
71 lines
1.8 KiB
C#
using BenchmarkDotNet.Attributes;
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using System.Buffers;
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namespace Recyclable.Collections.Benchmarks.POC
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{
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public enum ArraySizeLimitPocBenchmarkType
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{
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ArraySizeLimit
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}
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public class ArraySizeLimitPocBenchmarks : PocBenchmarkBase<ArraySizeLimitPocBenchmarkType>
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{
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public static void Run()
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{
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var benchmark = new ArraySizeLimitPocBenchmarks();
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benchmark.Setup();
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FindArraySizeLimit();
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benchmark.Cleanup();
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}
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[Params(2_147_483_605)]
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public override int TestObjectCount { get => base.TestObjectCount; set => base.TestObjectCount = value; }
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[Benchmark(OperationsPerInvoke = 1)]
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public void Max_Allowed_Size_2_147_483_605()
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{
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long[] arr = ArrayPool<long>.Shared.Rent(TestObjectCount);
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DoNothing(arr);
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}
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[Benchmark(OperationsPerInvoke = 1)]
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public static void FindArraySizeLimit()
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{
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var pool = ArrayPool<long>.Shared;
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var bufferSize = int.MaxValue / 2;
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var oldValue = 0;
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while (true)
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{
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try
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{
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Console.Write($"Allocating {bufferSize}...");
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var arr = pool.Rent(bufferSize);
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Console.WriteLine("success");
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pool.Return(arr);
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arr = null;
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var nextValue = bufferSize - oldValue;
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oldValue = bufferSize;
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bufferSize = checked(bufferSize + nextValue);
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GC.Collect(GC.MaxGeneration, GCCollectionMode.Forced, true, true);
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}
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catch (Exception)
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{
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Console.WriteLine("error");
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var nextValue = (bufferSize - oldValue) >> 1;
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if (nextValue == 0)
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{
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break;
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}
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bufferSize = oldValue + nextValue;
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}
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}
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Console.WriteLine("All done");
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throw new Exception($"Everything was successful. You can create {oldValue} byte big arrays. Exception is logged to prevent more benchmarks.");
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}
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}
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}
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