dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 12 Regressions on 3/16/2026 11:49:53 PM +00:00

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arch-wasm arch-x64 branch-refs/heads/main kind-micro os-linux perf-regression untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [2c7ee1937a8bd2f17a8f54d3b54bcaa0956f37f2](https://github.com/dotnet/runtime/commit/2c7ee1937a8bd2f17a8f54d3b54bcaa0956f37f2)
Compare | [fc529276b042443bd335adc6b5a26526e7ac9905](https://github.com/dotnet/runtime/commit/fc529276b042443bd335adc6b5a26526e7ac9905)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2c7ee1937a8bd2f17a8f54d3b54bcaa0956f37f2...fc529276b042443bd335adc6b5a26526e7ac9905)
Configs | CompilationMode:wasm, RunKind:micro

### Regressions in System.IO.Tests.Perf_File

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

  • [WriteAllBytes - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 55.45 ms | 62.33 ms | 1.12 | 0.21 | False | | |
|
  • [WriteAllBytes - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 16.29 μs | 18.19 μs | 1.12 | 0.18 | False | | |

![graph]()
![graph]()
[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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Tests.Perf_File*'
```

### System.IO.Tests.Perf_File.WriteAllBytes(size: 104857600)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_File.WriteAllBytes(size: 16384)

#### ETL Files

#### Histogram

#### JIT Disasms

### 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)

---

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [2c7ee1937a8bd2f17a8f54d3b54bcaa0956f37f2](https://github.com/dotnet/runtime/commit/2c7ee1937a8bd2f17a8f54d3b54bcaa0956f37f2)
Compare | [fc529276b042443bd335adc6b5a26526e7ac9905](https://github.com/dotnet/runtime/commit/fc529276b042443bd335adc6b5a26526e7ac9905)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2c7ee1937a8bd2f17a8f54d3b54bcaa0956f37f2...fc529276b042443bd335adc6b5a26526e7ac9905)
Configs | CompilationMode:wasm, RunKind:micro

### Regressions in System.Text.Encodings.Web.Tests.Perf_Encoders

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

  • [EncodeUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 592.43 ns | 767.62 ns | 1.30 | 0.07 | False | | |
|
  • [EncodeUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 708.48 ns | 821.09 ns | 1.16 | 0.09 | False | | |
|
  • [EncodeUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 476.94 ns | 689.47 ns | 1.45 | 0.07 | False | | |
|
  • [EncodeUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 827.05 ns | 998.33 ns | 1.21 | 0.06 | False | | |
|
  • [EncodeUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 631.99 ns | 782.29 ns | 1.24 | 0.10 | False | | |
|
  • [EncodeUtf16 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 777.69 ns | 908.83 ns | 1.17 | 0.03 | False | | |
|
  • [EncodeUtf16 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 484.54 ns | 627.59 ns | 1.30 | 0.07 | False | | |

![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
[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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Encodings.Web.Tests.Perf_Encoders*'
```

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf8(arguments: Url,&lorem ipsum=dolor sit amet,16)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf8(arguments: JavaScript,&Hello+<World>!,512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf8(arguments: JavaScript,&Hello+<World>!,16)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf8(arguments: Url,&lorem ipsum=dolor sit amet,512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf8(arguments: UnsafeRelaxed,hello "there",512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf16(arguments: Url,&lorem ipsum=dolor sit amet,512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Encodings.Web.Tests.Perf_Encoders.EncodeUtf16(arguments: Url,&lorem ipsum=dolor sit amet,16)

#### ETL Files

#### Histogram

#### JIT Disasms

### 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)

---

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [2c7ee1937a8bd2f17a8f54d3b54bcaa0956f37f2](https://github.com/dotnet/runtime/commit/2c7ee1937a8bd2f17a8f54d3b54bcaa0956f37f2)
Compare | [fc529276b042443bd335adc6b5a26526e7ac9905](https://github.com/dotnet/runtime/commit/fc529276b042443bd335adc6b5a26526e7ac9905)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2c7ee1937a8bd2f17a8f54d3b54bcaa0956f37f2...fc529276b042443bd335adc6b5a26526e7ac9905)
Configs | CompilationMode:wasm, RunKind:micro

### Regressions in System.IO.Tests.Perf_FileStream

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

  • [Write_NoBuffering_PreallocationSize - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 548.58 ms | 635.58 ms | 1.16 | 0.17 | False | | |
|
  • [Read_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.97 ms | 12.54 ms | 1.26 | 0.10 | False | | |
|
  • [Read - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 807.33 μs | 1.25 ms | 1.55 | 0.07 | False | | |

![graph]()
![graph]()
![graph]()
[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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Tests.Perf_FileStream*'
```

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### 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)

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