dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 7 Regressions on 4/26/2026 6:53:57 PM +00:00

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

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [4e26169766106d54cf582a095878d6d439763335](https://github.com/dotnet/runtime/commit/4e26169766106d54cf582a095878d6d439763335)
Compare | [5ef1257b9b3042bd577bc93003bac71432830fbb](https://github.com/dotnet/runtime/commit/5ef1257b9b3042bd577bc93003bac71432830fbb)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4e26169766106d54cf582a095878d6d439763335...5ef1257b9b3042bd577bc93003bac71432830fbb)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Buffers.Tests.ReadOnlySequenceTests<Char>

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

  • [SliceTenSegments - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.91 μs | 2.45 μs | 1.28 | 0.30 | False | | |
|
  • [IterateGetPositionArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.70 μs | 4.68 μs | 1.27 | 0.35 | False | | |
|
  • [FirstSpanArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 455.66 ns | 496.05 ns | 1.09 | 0.47 | False | | |
|
  • [IterateTryGetArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 712.30 ns | 774.50 ns | 1.09 | 0.39 | False | | |
|
  • [FirstArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 319.62 ns | 339.08 ns | 1.06 | 0.46 | 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.Buffers.Tests.ReadOnlySequenceTests*'
```

### System.Buffers.Tests.ReadOnlySequenceTests<Char>.SliceTenSegments

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Tests.ReadOnlySequenceTests<Char>.IterateGetPositionArray

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Tests.ReadOnlySequenceTests<Char>.FirstSpanArray

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Tests.ReadOnlySequenceTests<Char>.IterateTryGetArray

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Tests.ReadOnlySequenceTests<Char>.FirstArray

#### 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 | [4e26169766106d54cf582a095878d6d439763335](https://github.com/dotnet/runtime/commit/4e26169766106d54cf582a095878d6d439763335)
Compare | [5ef1257b9b3042bd577bc93003bac71432830fbb](https://github.com/dotnet/runtime/commit/5ef1257b9b3042bd577bc93003bac71432830fbb)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4e26169766106d54cf582a095878d6d439763335...5ef1257b9b3042bd577bc93003bac71432830fbb)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in GuardedDevirtualization.ThreeClassInterface

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

  • [Call - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 51.67 ns | 55.28 ns | 1.07 | 0.32 | 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 'GuardedDevirtualization.ThreeClassInterface*'
```

### GuardedDevirtualization.ThreeClassInterface.Call(testInput: pB=1.00 pD=0.00)

#### 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 | [4e26169766106d54cf582a095878d6d439763335](https://github.com/dotnet/runtime/commit/4e26169766106d54cf582a095878d6d439763335)
Compare | [5ef1257b9b3042bd577bc93003bac71432830fbb](https://github.com/dotnet/runtime/commit/5ef1257b9b3042bd577bc93003bac71432830fbb)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4e26169766106d54cf582a095878d6d439763335...5ef1257b9b3042bd577bc93003bac71432830fbb)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Text.Json.Tests.Perf_Deep

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

  • [WriteDeepUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.21 secs | 10.54 secs | 1.14 | 0.28 | 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.Text.Json.Tests.Perf_Deep*'
```

### System.Text.Json.Tests.Perf_Deep.WriteDeepUtf8(Formatted: True, SkipValidation: False)

#### 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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