dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x64: 4 Regressions on 5/23/2026 12:54:53 AM +00:00

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arch-x64 branch-refs/heads/main compilationmode-tiered kind-micro Look Again os-windows perf-regression PGO runkind-micro runtime-coreclr
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [0e2d6c5809808067e82ebb6b1ec1c4f1f99e057f](https://github.com/dotnet/runtime/commit/0e2d6c5809808067e82ebb6b1ec1c4f1f99e057f)
Compare | [2dce83ad91efd1efbf974eb636a18f9b0fcdcb17](https://github.com/dotnet/runtime/commit/2dce83ad91efd1efbf974eb636a18f9b0fcdcb17)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0e2d6c5809808067e82ebb6b1ec1c4f1f99e057f...2dce83ad91efd1efbf974eb636a18f9b0fcdcb17)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.HashSetContains<Int32>

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

  • [ContainsFalse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.13 μs | 1.20 μs | 1.07 | 0.01 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.HashSetContains*'
```

### System.Collections.HashSetContains<Int32>.ContainsFalse(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 | Windows 10.0.22631
Queue | ViperWindows
Baseline | [eb5503a1f0dc40ee7b73eb79a039eb143ee25038](https://github.com/dotnet/runtime/commit/eb5503a1f0dc40ee7b73eb79a039eb143ee25038)
Compare | [6d631290af2a27c1e021a090a44931df519a2db2](https://github.com/dotnet/runtime/commit/6d631290af2a27c1e021a090a44931df519a2db2)
Diff | [Diff](https://github.com/dotnet/runtime/compare/eb5503a1f0dc40ee7b73eb79a039eb143ee25038...6d631290af2a27c1e021a090a44931df519a2db2)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Reflection.Attributes

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

  • [GetCustomAttributesClassMissInherit - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 153.54 ns | 194.43 ns | 1.27 | 0.44 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Reflection.Attributes*'
```

### System.Reflection.Attributes.GetCustomAttributesClassMissInherit

#### 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 | Windows 10.0.22631
Queue | ViperWindows
Baseline | [0e2d6c5809808067e82ebb6b1ec1c4f1f99e057f](https://github.com/dotnet/runtime/commit/0e2d6c5809808067e82ebb6b1ec1c4f1f99e057f)
Compare | [6d631290af2a27c1e021a090a44931df519a2db2](https://github.com/dotnet/runtime/commit/6d631290af2a27c1e021a090a44931df519a2db2)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0e2d6c5809808067e82ebb6b1ec1c4f1f99e057f...6d631290af2a27c1e021a090a44931df519a2db2)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Collections.CreateAddAndClear<String>

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

  • [ConcurrentBag - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 10.29 μs | 11.81 μs | 1.15 | 0.01 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.CreateAddAndClear*'
```

### System.Collections.CreateAddAndClear<String>.ConcurrentBag(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 | Windows 10.0.22631
Queue | ViperWindows
Baseline | [0e2d6c5809808067e82ebb6b1ec1c4f1f99e057f](https://github.com/dotnet/runtime/commit/0e2d6c5809808067e82ebb6b1ec1c4f1f99e057f)
Compare | [6d631290af2a27c1e021a090a44931df519a2db2](https://github.com/dotnet/runtime/commit/6d631290af2a27c1e021a090a44931df519a2db2)
Diff | [Diff](https://github.com/dotnet/runtime/compare/0e2d6c5809808067e82ebb6b1ec1c4f1f99e057f...6d631290af2a27c1e021a090a44931df519a2db2)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in PerfLabTests.GetMember

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

  • [GetMethod1 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 14.89 μs | 26.81 μs | 1.80 | 0.09 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'PerfLabTests.GetMember*'
```

### PerfLabTests.GetMember.GetMethod1

#### 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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