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add File.CopyTo benchmarks #2134

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Nov 16, 2021
Merged

add File.CopyTo benchmarks #2134

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31 changes: 27 additions & 4 deletions src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.File.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -83,9 +83,12 @@ public void SetupWriteAllBytes()
[Arguments(HundredMibibytes)]
public void WriteAllBytes(int size) => File.WriteAllBytes(_testFilePath, _userBuffers[size]);

[GlobalSetup(Targets = new[] { nameof(ReadAllBytes), "ReadAllBytesAsync" })]
[GlobalSetup(Targets = new[] { nameof(ReadAllBytes), "ReadAllBytesAsync", nameof(CopyTo), nameof(CopyToOverwrite) })]
public void SetupReadAllBytes()
{
// use non-temp file path to ensure that we don't test some unusal File System on Unix
string baseDir = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
File.WriteAllBytes(_testFilePath = Path.Combine(baseDir, Path.GetTempFileName()), Array.Empty<byte>());
_filesToRead = new Dictionary<int, string>()
{
{ HalfKibibyte, WriteBytes(HalfKibibyte) },
Expand All @@ -95,19 +98,21 @@ public void SetupReadAllBytes()
{ HundredMibibytes, WriteBytes(HundredMibibytes) },
};

static string WriteBytes(int fileSize)
string WriteBytes(int fileSize)
{
string filePath = FileUtils.GetTestFilePath();
string filePath = Path.Combine(baseDir, Path.GetTempFileName());
File.WriteAllBytes(filePath, ValuesGenerator.Array<byte>(fileSize));
return filePath;
}
}

[GlobalCleanup(Targets = new[] { nameof(ReadAllBytes), "ReadAllBytesAsync" })]
[GlobalCleanup(Targets = new[] { nameof(ReadAllBytes), "ReadAllBytesAsync", nameof(CopyTo), nameof(CopyToOverwrite) })]
public void CleanupReadAllBytes()
{
foreach (string filePath in _filesToRead.Values)
File.Delete(filePath);

File.Delete(_testFilePath);
}

[Benchmark]
Expand Down Expand Up @@ -228,5 +233,23 @@ public async Task AppendAllTextAsync(int size)
[Arguments(100_000)]
public Task WriteAllTextAsync(int size) => File.WriteAllTextAsync(_testFilePath, _textToAppend[size]);
#endif

[Benchmark]
[Arguments(HalfKibibyte)]
[Arguments(FourKibibytes)]
[Arguments(OneMibibyte)]
[Arguments(HundredMibibytes)]
public void CopyTo(int size)
{
File.Delete(_testFilePath);
File.Copy(_filesToRead[size], _testFilePath); // overwrite defaults to false
}

[Benchmark]
[Arguments(HalfKibibyte)]
[Arguments(FourKibibytes)]
[Arguments(OneMibibyte)]
[Arguments(HundredMibibytes)]
public void CopyToOverwrite(int size) => File.Copy(_filesToRead[size], _testFilePath, overwrite: true);
}
}