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Perf.RandomAccess.cs
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Perf.RandomAccess.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Extensions;
using MicroBenchmarks;
using Microsoft.Win32.SafeHandles;
namespace System.IO.Tests
{
[BenchmarkCategory(Categories.Libraries)]
public class Perf_RandomAccess
{
private const int OneKibibyte = 1 << 10; // 1024
private const int FourKibibytes = OneKibibyte << 2; // default Stream buffer size
private const int SixteenKibibytes = FourKibibytes << 2; // default Stream buffer size * 4
private const int SixtyFourKibibytes = SixteenKibibytes << 2; // default Stream buffer size * 16
private const int OneMibibyte = OneKibibyte << 10;
private const int HundredMibibytes = OneMibibyte * 100;
private Dictionary<long, string> _sourceFilePaths, _destinationFilePaths;
private Dictionary<int, byte[]> _sizeToBuffer;
private Dictionary<int, byte[][]> _sizeToBuffers;
private void Setup(params long[] fileSizes)
{
_sizeToBuffer = new Dictionary<int, byte[]>()
{
{ FourKibibytes, ValuesGenerator.Array<byte>(FourKibibytes) },
{ SixteenKibibytes, ValuesGenerator.Array<byte>(SixteenKibibytes) },
};
_sizeToBuffers = new Dictionary<int, byte[][]>()
{
{ SixteenKibibytes, Enumerable.Range(0, 4).Select(_ => ValuesGenerator.Array<byte>(FourKibibytes)).ToArray() },
{ SixtyFourKibibytes, Enumerable.Range(0, 4).Select(_ => ValuesGenerator.Array<byte>(SixteenKibibytes)).ToArray() },
};
_sourceFilePaths = fileSizes.ToDictionary(size => size, size => CreateFileWithRandomContent(size));
_destinationFilePaths = fileSizes.ToDictionary(size => size, size => CreateFileWithRandomContent(size));
static string CreateFileWithRandomContent(long fileSize)
{
string filePath = FileUtils.GetTestFilePath();
File.WriteAllBytes(filePath, ValuesGenerator.Array<byte>((int)fileSize));
return filePath;
}
}
[GlobalCleanup]
public void Cleanup()
{
foreach (string filePath in _sourceFilePaths.Values.Concat(_destinationFilePaths.Values))
{
File.Delete(filePath);
}
}
[GlobalSetup(Targets = new[] { nameof(Read), nameof(ReadScatter), nameof(ReadAsync), nameof(ReadScatterAsync),
nameof(Write), nameof(WriteGather), nameof(WriteAsync), nameof(WriteGatherAsync) })]
public void SetupBigFileBenchmarks() => Setup(OneMibibyte, HundredMibibytes);
public IEnumerable<object[]> ReadWrite_SingleBuffer_Arguments()
{
// long fileSize, int bufferSize, FileOptions options
foreach (FileOptions options in new FileOptions[] { FileOptions.None, FileOptions.Asynchronous })
{
yield return new object[] { OneMibibyte, FourKibibytes, options }; // medium size file, user buffer size == default stream buffer size
yield return new object[] { HundredMibibytes, SixteenKibibytes, options }; // big file, user buffer size == 4 * default stream buffer size
}
}
[Benchmark]
[ArgumentsSource(nameof(ReadWrite_SingleBuffer_Arguments))]
public long Read(long fileSize, int bufferSize, FileOptions options)
{
byte[] userBuffer = _sizeToBuffer[bufferSize];
long bytesRead = 0;
using (SafeFileHandle fileHandle = File.OpenHandle(_sourceFilePaths[fileSize], FileMode.Open, FileAccess.Read, FileShare.Read, options))
{
while (bytesRead < fileSize)
{
bytesRead += RandomAccess.Read(fileHandle, userBuffer, bytesRead);
}
}
return bytesRead;
}
[Benchmark]
[ArgumentsSource(nameof(ReadWrite_SingleBuffer_Arguments))]
public void Write(long fileSize, int bufferSize, FileOptions options)
{
byte[] userBuffer = _sizeToBuffer[bufferSize];
using (SafeFileHandle fileHandle = File.OpenHandle(_destinationFilePaths[fileSize], FileMode.Create, FileAccess.Write, FileShare.Read, options))
{
long bytesWritten = 0;
for (int i = 0; i < fileSize / bufferSize; i++)
{
RandomAccess.Write(fileHandle, userBuffer, bytesWritten);
bytesWritten += userBuffer.Length;
}
}
}
[Benchmark]
[ArgumentsSource(nameof(ReadWrite_SingleBuffer_Arguments))]
[BenchmarkCategory(Categories.NoWASM)]
public async Task<long> ReadAsync(long fileSize, int bufferSize, FileOptions options)
{
CancellationToken cancellationToken = CancellationToken.None;
Memory<byte> userBuffer = new Memory<byte>(_sizeToBuffer[bufferSize]);
long bytesRead = 0;
using (SafeFileHandle fileHandle = File.OpenHandle(_sourceFilePaths[fileSize], FileMode.Open, FileAccess.Read, FileShare.Read, options))
{
while (bytesRead < fileSize)
{
bytesRead += await RandomAccess.ReadAsync(fileHandle, userBuffer, bytesRead, cancellationToken);
}
}
return bytesRead;
}
[Benchmark]
[ArgumentsSource(nameof(ReadWrite_SingleBuffer_Arguments))]
[BenchmarkCategory(Categories.NoWASM)]
public async Task WriteAsync(long fileSize, int bufferSize, FileOptions options)
{
CancellationToken cancellationToken = CancellationToken.None;
Memory<byte> userBuffer = new Memory<byte>(_sizeToBuffer[bufferSize]);
using (SafeFileHandle fileHandle = File.OpenHandle(_destinationFilePaths[fileSize], FileMode.Create, FileAccess.Write, FileShare.Read, options))
{
long bytesWritten = 0;
for (int i = 0; i < fileSize / bufferSize; i++)
{
await RandomAccess.WriteAsync(fileHandle, userBuffer, bytesWritten, cancellationToken);
bytesWritten += userBuffer.Length;
}
}
}
public IEnumerable<object[]> ReadWrite_MultipleBuffers_Arguments()
{
// long fileSize, int buffersSize, FileOptions options
foreach (FileOptions options in new FileOptions[] { FileOptions.None, FileOptions.Asynchronous })
{
yield return new object[] { OneMibibyte, SixteenKibibytes, options }; // medium size file, 4x4Mib user buffers
yield return new object[] { HundredMibibytes, SixtyFourKibibytes, options }; // big file, 4x16Mib user buffers
}
}
[Benchmark]
[ArgumentsSource(nameof(ReadWrite_MultipleBuffers_Arguments))]
public long ReadScatter(long fileSize, int buffersSize, FileOptions options)
{
byte[][] b = _sizeToBuffers[buffersSize];
IReadOnlyList<Memory<byte>> buffers = new Memory<byte>[] { b[0], b[1], b[2], b[3], };
long bytesRead = 0;
using (SafeFileHandle fileHandle = File.OpenHandle(_sourceFilePaths[fileSize], FileMode.Open, FileAccess.Read, FileShare.Read, options))
{
while (bytesRead < fileSize)
{
bytesRead += RandomAccess.Read(fileHandle, buffers, bytesRead);
}
}
return bytesRead;
}
[Benchmark]
[ArgumentsSource(nameof(ReadWrite_MultipleBuffers_Arguments))]
public void WriteGather(long fileSize, int buffersSize, FileOptions options)
{
byte[][] b = _sizeToBuffers[buffersSize];
IReadOnlyList<ReadOnlyMemory<byte>> buffers = new ReadOnlyMemory<byte>[] { b[0], b[1], b[2], b[3], };
using (SafeFileHandle fileHandle = File.OpenHandle(_destinationFilePaths[fileSize], FileMode.Create, FileAccess.Write, FileShare.Read, options))
{
long bytesWritten = 0;
for (int i = 0; i < fileSize / buffersSize; i++)
{
RandomAccess.Write(fileHandle, buffers, bytesWritten);
bytesWritten += buffersSize;
}
}
}
[Benchmark]
[ArgumentsSource(nameof(ReadWrite_MultipleBuffers_Arguments))]
[BenchmarkCategory(Categories.NoWASM)]
public async Task<long> ReadScatterAsync(long fileSize, int buffersSize, FileOptions options)
{
CancellationToken cancellationToken = CancellationToken.None;
byte[][] b = _sizeToBuffers[buffersSize];
IReadOnlyList<Memory<byte>> buffers = new Memory<byte>[] { b[0], b[1], b[2], b[3], };
long bytesRead = 0;
using (SafeFileHandle fileHandle = File.OpenHandle(_sourceFilePaths[fileSize], FileMode.Open, FileAccess.Read, FileShare.Read, options))
{
while (bytesRead < fileSize)
{
bytesRead += await RandomAccess.ReadAsync(fileHandle, buffers, bytesRead, cancellationToken);
}
}
return bytesRead;
}
[Benchmark]
[ArgumentsSource(nameof(ReadWrite_MultipleBuffers_Arguments))]
[BenchmarkCategory(Categories.NoWASM)]
public async Task WriteGatherAsync(long fileSize, int buffersSize, FileOptions options)
{
CancellationToken cancellationToken = CancellationToken.None;
byte[][] b = _sizeToBuffers[buffersSize];
IReadOnlyList<ReadOnlyMemory<byte>> buffers = new ReadOnlyMemory<byte>[] { b[0], b[1], b[2], b[3], };
using (SafeFileHandle fileHandle = File.OpenHandle(_destinationFilePaths[fileSize], FileMode.Create, FileAccess.Write, FileShare.Read, options))
{
long bytesWritten = 0;
for (int i = 0; i < fileSize / buffersSize; i++)
{
await RandomAccess.WriteAsync(fileHandle, buffers, bytesWritten, cancellationToken);
bytesWritten += buffersSize;
}
}
}
}
}