dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x86: 56 Improvements on 7/13/2026 8:32:42 PM +00:00

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arch-x86 bdn-update branch-refs/heads/main compilationmode-tiered kind-micro os-windows perf-improvement runkind-micro runtime-coreclr triage-error untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [a90733cc40d6c7037a37d9c2b5c2403b8cac490f](https://github.com/dotnet/runtime/commit/a90733cc40d6c7037a37d9c2b5c2403b8cac490f)
Compare | [f2b30309fd488f1c3fd41c18723a7c80a81f4c67](https://github.com/dotnet/runtime/commit/f2b30309fd488f1c3fd41c18723a7c80a81f4c67)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a90733cc40d6c7037a37d9c2b5c2403b8cac490f...f2b30309fd488f1c3fd41c18723a7c80a81f4c67)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.IO.Tests.Perf_FileStream

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3270.15 μs | 579.12 μs | 0.18 | 0.65 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3119.99 μs | 724.84 μs | 0.23 | 0.71 | False | | |
|
  • [ReadAsync_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 570.55 μs | 177.33 μs | 0.31 | 0.68 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.71 ms | 1.06 ms | 0.39 | 0.71 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.45 ms | 2.78 ms | 0.43 | 0.58 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.03 ms | 2.60 ms | 0.43 | 0.55 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 226.08 ms | 97.87 ms | 0.43 | 0.66 | False | | |
|
  • [WriteAsync_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 903.25 μs | 437.19 μs | 0.48 | 0.65 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 147.04 ms | 72.17 ms | 0.49 | 0.58 | False | | |
|
  • [FlushAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 13.42 ms | 6.85 ms | 0.51 | 0.61 | False | | |
|
  • [FlushAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 20.73 ms | 11.62 ms | 0.56 | 0.32 | False | | |
|
  • [ReadAsync_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 105.95 ms | 62.53 ms | 0.59 | 0.47 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.76 ms | 2.82 ms | 0.59 | 0.43 | False | | |
|
  • [AppendAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.74 ms | 2.82 ms | 0.59 | 0.58 | False | | |
|
  • [WriteAsync_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 114.16 ms | 68.65 ms | 0.60 | 0.43 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.31 ms | 2.61 ms | 0.60 | 0.59 | False | | |
|
  • [ReadAsync_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1066.15 μs | 664.94 μs | 0.62 | 0.58 | False | | |
|
  • [WriteAsync_NoBuffering_PreallocationSize - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 112.68 ms | 71.77 ms | 0.64 | 0.37 | False | | |
|
  • [WriteAsync_NoBuffering_PreallocationSize - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 1502.20 μs | 969.43 μs | 0.65 | 0.34 | False | | |
|
  • [WriteAsync_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1515.78 μs | 994.13 μs | 0.66 | 0.57 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 38.49 μs | 25.97 μs | 0.67 | 0.43 | False | | |
|
  • [WriteAsync_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 66.47 ms | 45.30 ms | 0.68 | 0.43 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 403.30 ms | 277.24 ms | 0.69 | 0.54 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 21.83 μs | 16.99 μs | 0.78 | 0.67 | False | | |
|
  • [CopyToFileAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 151.59 μs | 141.65 μs | 0.93 | 0.29 | False | | |

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[Test Report]()

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

```cmd
git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Tests.Perf_FileStream*'
```

### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1048576, userBufferSize: 4096, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1048576, userBufferSize: 512, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync_NoBuffering(fileSize: 1048576, userBufferSize: 16384, options: None)

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#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync(fileSize: 1048576, userBufferSize: 4096, options: None)

#### ETL Files

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#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync(fileSize: 1048576, userBufferSize: 4096, options: Asynchronous)

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### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1048576, userBufferSize: 512, options: Asynchronous)

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#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync(fileSize: 104857600, userBufferSize: 4096, options: None)

#### ETL Files

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#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync_NoBuffering(fileSize: 1048576, userBufferSize: 16384, options: None)

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### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 104857600, userBufferSize: 4096, options: None)

#### ETL Files

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### System.IO.Tests.Perf_FileStream.FlushAsync(fileSize: 1024, options: None)

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### System.IO.Tests.Perf_FileStream.FlushAsync(fileSize: 1024, options: Asynchronous)

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### System.IO.Tests.Perf_FileStream.ReadAsync_NoBuffering(fileSize: 104857600, userBufferSize: 16384, options: Asynchronous)

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### System.IO.Tests.Perf_FileStream.WriteAsync(fileSize: 1048576, userBufferSize: 512, options: Asynchronous)

#### ETL Files

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### System.IO.Tests.Perf_FileStream.AppendAsync(fileSize: 1048576, userBufferSize: 4096, options: DeleteOnClose, Asynchronous)

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### System.IO.Tests.Perf_FileStream.WriteAsync_NoBuffering(fileSize: 104857600, userBufferSize: 16384, options: Asynchronous)

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### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1048576, userBufferSize: 4096, options: Asynchronous)

#### ETL Files

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### System.IO.Tests.Perf_FileStream.ReadAsync_NoBuffering(fileSize: 1048576, userBufferSize: 16384, options: Asynchronous)

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### System.IO.Tests.Perf_FileStream.WriteAsync_NoBuffering_PreallocationSize(fileSize: 104857600, userBufferSize: 16384, options: Asynchronous)

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### System.IO.Tests.Perf_FileStream.WriteAsync_NoBuffering_PreallocationSize(fileSize: 1048576, userBufferSize: 16384, options: Asynchronous)

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### System.IO.Tests.Perf_FileStream.WriteAsync_NoBuffering(fileSize: 1048576, userBufferSize: 16384, options: Asynchronous)

#### ETL Files

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#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1024, userBufferSize: 1024, options: Asynchronous)

#### ETL Files

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### System.IO.Tests.Perf_FileStream.WriteAsync_NoBuffering(fileSize: 104857600, userBufferSize: 16384, options: None)

#### ETL Files

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#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync(fileSize: 104857600, userBufferSize: 4096, options: Asynchronous)

#### ETL Files

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#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1024, userBufferSize: 1024, options: None)

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### System.IO.Tests.Perf_FileStream.CopyToFileAsync(fileSize: 1024, options: Asynchronous)

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### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

Contributor guide

No contributing guide indexed for this repository

Research direction

Start with the linked benchmark reports and the benchmark source at src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.FileStream.cs, especially lines 280-318. Compare the Windows x86 results for the listed ReadAsync and WriteAsync cases, then determine whether a repository change is warranted; the issue does not define a specific fix or completion test.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
25/100

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