dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 5 Regressions on 3/18/2026 4:09:22 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 | [c31475ea97de93297d055374284e1b1d4769332d](https://github.com/dotnet/runtime/commit/c31475ea97de93297d055374284e1b1d4769332d)
Compare | [01ee086359f0b721e47c9746aba5d8e95f7de970](https://github.com/dotnet/runtime/commit/01ee086359f0b721e47c9746aba5d8e95f7de970)
Diff | [Diff](https://github.com/dotnet/runtime/compare/c31475ea97de93297d055374284e1b1d4769332d...01ee086359f0b721e47c9746aba5d8e95f7de970)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Reflection.Invoke

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

  • [Ctor0_ActivatorCreateInstance_NoParams - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.00 μs | 1.25 μs | 1.24 | 0.26 | 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.Reflection.Invoke*'
```

### System.Reflection.Invoke.Ctor0_ActivatorCreateInstance_NoParams

#### 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 | [c31475ea97de93297d055374284e1b1d4769332d](https://github.com/dotnet/runtime/commit/c31475ea97de93297d055374284e1b1d4769332d)
Compare | [01ee086359f0b721e47c9746aba5d8e95f7de970](https://github.com/dotnet/runtime/commit/01ee086359f0b721e47c9746aba5d8e95f7de970)
Diff | [Diff](https://github.com/dotnet/runtime/compare/c31475ea97de93297d055374284e1b1d4769332d...01ee086359f0b721e47c9746aba5d8e95f7de970)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Reflection.Activator<EmptyStruct>

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

  • [CreateInstanceType - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 951.73 ns | 1.12 μs | 1.18 | 0.22 | 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.Reflection.Activator*'
```

### System.Reflection.Activator<EmptyStruct>.CreateInstanceType

#### 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 | [c31475ea97de93297d055374284e1b1d4769332d](https://github.com/dotnet/runtime/commit/c31475ea97de93297d055374284e1b1d4769332d)
Compare | [01ee086359f0b721e47c9746aba5d8e95f7de970](https://github.com/dotnet/runtime/commit/01ee086359f0b721e47c9746aba5d8e95f7de970)
Diff | [Diff](https://github.com/dotnet/runtime/compare/c31475ea97de93297d055374284e1b1d4769332d...01ee086359f0b721e47c9746aba5d8e95f7de970)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Reflection.Activator<EmptyClass>

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

  • [CreateInstanceType - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 972.33 ns | 1.10 μs | 1.14 | 0.28 | False | | |
|
  • [CreateInstanceGeneric - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 937.99 ns | 1.24 μs | 1.32 | 0.25 | 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.Reflection.Activator*'
```

### System.Reflection.Activator<EmptyClass>.CreateInstanceType

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Reflection.Activator<EmptyClass>.CreateInstanceGeneric

#### 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 | [c31475ea97de93297d055374284e1b1d4769332d](https://github.com/dotnet/runtime/commit/c31475ea97de93297d055374284e1b1d4769332d)
Compare | [01ee086359f0b721e47c9746aba5d8e95f7de970](https://github.com/dotnet/runtime/commit/01ee086359f0b721e47c9746aba5d8e95f7de970)
Diff | [Diff](https://github.com/dotnet/runtime/compare/c31475ea97de93297d055374284e1b1d4769332d...01ee086359f0b721e47c9746aba5d8e95f7de970)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

  • [Clear - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.84 μs | 1.94 μs | 1.05 | 0.50 | 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<Char>.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)

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