dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 11 Regressions on 3/19/2026 3:35:34 PM +00:00

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arch-wasm arch-x64 bdn-update branch-refs/heads/main kind-micro mono-interpreter os-linux perf-regression runtime-mono wasm-aot
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [12cdada8d6a5d342c3d0647b3c2f5b1d36c08821](https://github.com/dotnet/runtime/commit/12cdada8d6a5d342c3d0647b3c2f5b1d36c08821)
Compare | [37c96934b3fdeeceae7bfd730c736c5667e32c7c](https://github.com/dotnet/runtime/commit/37c96934b3fdeeceae7bfd730c736c5667e32c7c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/12cdada8d6a5d342c3d0647b3c2f5b1d36c08821...37c96934b3fdeeceae7bfd730c736c5667e32c7c)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Memory.Span<Int32>

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

  • [Reverse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 16.68 ns | 29.02 ns | 1.74 | 0.23 | False | | |
|
  • [Reverse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 58.47 ns | 72.78 ns | 1.24 | 0.06 | False | | |
|
  • [Clear - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 7.66 ns | 27.98 ns | 3.66 | 0.46 | False | | |
|
  • [Fill - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.68 ns | 13.65 ns | 1.41 | 0.31 | False | | |
|
  • [Clear - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 21.91 ns | 31.63 ns | 1.44 | 0.36 | False | | |

![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.Memory.Span*'
```

### System.Memory.Span<Int32>.Reverse(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.Reverse(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.Clear(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.Fill(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.Clear(Size: 512)

#### 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 | [12cdada8d6a5d342c3d0647b3c2f5b1d36c08821](https://github.com/dotnet/runtime/commit/12cdada8d6a5d342c3d0647b3c2f5b1d36c08821)
Compare | [37c96934b3fdeeceae7bfd730c736c5667e32c7c](https://github.com/dotnet/runtime/commit/37c96934b3fdeeceae7bfd730c736c5667e32c7c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/12cdada8d6a5d342c3d0647b3c2f5b1d36c08821...37c96934b3fdeeceae7bfd730c736c5667e32c7c)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Memory.Span<Byte>

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

  • [Reverse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 28.04 ns | 33.50 ns | 1.19 | 0.20 | False | | |

![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.Memory.Span*'
```

### System.Memory.Span<Byte>.Reverse(Size: 512)

#### 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 | [12cdada8d6a5d342c3d0647b3c2f5b1d36c08821](https://github.com/dotnet/runtime/commit/12cdada8d6a5d342c3d0647b3c2f5b1d36c08821)
Compare | [37c96934b3fdeeceae7bfd730c736c5667e32c7c](https://github.com/dotnet/runtime/commit/37c96934b3fdeeceae7bfd730c736c5667e32c7c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/12cdada8d6a5d342c3d0647b3c2f5b1d36c08821...37c96934b3fdeeceae7bfd730c736c5667e32c7c)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Text.RegularExpressions.Tests.Perf_Regex_Common

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

  • [Ctor - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.72 μs | 9.74 μs | 1.12 | 0.05 | False | | |
|
  • [CtorInvoke - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 17.17 μs | 18.86 μs | 1.10 | 0.04 | False | | |
|
  • [Email_IsNotMatch - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 694.20 ns | 733.13 ns | 1.06 | 0.09 | False | | |
|
  • [Ctor - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 16.85 μs | 18.55 μs | 1.10 | 0.06 | False | | |
|
  • [CtorInvoke - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.91 μs | 10.21 μs | 1.15 | 0.09 | False | | |

![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.RegularExpressions.Tests.Perf_Regex_Common*'
```

### System.Text.RegularExpressions.Tests.Perf_Regex_Common.Ctor(Options: Compiled)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.RegularExpressions.Tests.Perf_Regex_Common.CtorInvoke(Options: IgnoreCase, Compiled)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.RegularExpressions.Tests.Perf_Regex_Common.Email_IsNotMatch(Options: IgnoreCase, Compiled)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.RegularExpressions.Tests.Perf_Regex_Common.Ctor(Options: IgnoreCase, Compiled)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.RegularExpressions.Tests.Perf_Regex_Common.CtorInvoke(Options: Compiled)

#### 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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