dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 60 Regressions on 5/19/2026 5:33:16 PM +00:00

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arch-wasm arch-x64 bdn-update 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 | [21d1570e075a895f62c292a5e1854947b97c7dbc](https://github.com/dotnet/runtime/commit/21d1570e075a895f62c292a5e1854947b97c7dbc)
Compare | [f397c835cc1c655505d2a22fd0cebb9e96733d0b](https://github.com/dotnet/runtime/commit/f397c835cc1c655505d2a22fd0cebb9e96733d0b)
Diff | [Diff](https://github.com/dotnet/runtime/compare/21d1570e075a895f62c292a5e1854947b97c7dbc...f397c835cc1c655505d2a22fd0cebb9e96733d0b)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in Exceptions.Handling

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

  • [ThrowAndCatchWhenFinally - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.85 μs | 7.05 μs | 1.21 | 0.21 | False | | |
|
  • [ThrowAndCatchWhen - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.01 μs | 7.05 μs | 1.17 | 0.21 | False | | |
|
  • [ThrowAndCatch - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 18.85 μs | 22.12 μs | 1.17 | 0.16 | False | | |
|
  • [MultipleNestedTryFinally - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.27 μs | 7.21 μs | 1.15 | 0.16 | False | | |
|
  • [ThrowAndCatchWhenFinally - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.78 μs | 5.33 μs | 1.12 | 0.23 | False | | |
|
  • [MultipleNestedTryCatch_FirstCatches - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.70 μs | 6.34 μs | 1.11 | 0.14 | False | | |
|
  • [ThrowAndCatchFinally - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.81 μs | 6.44 μs | 1.11 | 0.16 | False | | |
|
  • [MultipleNestedTryFinally - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.09 μs | 5.62 μs | 1.10 | 0.17 | False | | |
|
  • [ThrowAndCatch - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.60 μs | 5.00 μs | 1.09 | 0.18 | False | | |
|
  • [ThrowAndCatch - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.67 μs | 6.16 μs | 1.09 | 0.19 | False | | |
|
  • [ThrowAndCatchFinally - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.64 μs | 4.99 μs | 1.07 | 0.21 | False | | |

![graph]()
![graph]()
![graph]()
![graph]()
![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 'Exceptions.Handling*'
```

### Exceptions.Handling.ThrowAndCatchWhenFinally(kind: Hardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchWhen(kind: Hardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatch(kind: ReflectionHardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.MultipleNestedTryFinally(kind: Hardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchWhenFinally(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.MultipleNestedTryCatch_FirstCatches(kind: Hardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchFinally(kind: Hardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.MultipleNestedTryFinally(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatch(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatch(kind: Hardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.ThrowAndCatchFinally(kind: Software)

#### 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 | [21d1570e075a895f62c292a5e1854947b97c7dbc](https://github.com/dotnet/runtime/commit/21d1570e075a895f62c292a5e1854947b97c7dbc)
Compare | [f397c835cc1c655505d2a22fd0cebb9e96733d0b](https://github.com/dotnet/runtime/commit/f397c835cc1c655505d2a22fd0cebb9e96733d0b)
Diff | [Diff](https://github.com/dotnet/runtime/compare/21d1570e075a895f62c292a5e1854947b97c7dbc...f397c835cc1c655505d2a22fd0cebb9e96733d0b)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

  • [List - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 342.99 ns | 448.36 ns | 1.31 | 0.07 | False | | |
|
  • [Array - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 165.89 ns | 212.48 ns | 1.28 | 0.07 | False | | |
|
  • [Queue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 375.32 ns | 472.53 ns | 1.26 | 0.09 | False | | |
|
  • [SortedList - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 812.15 ns | 1015.94 ns | 1.25 | 0.12 | False | | |
|
  • [Stack - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 379.32 ns | 467.56 ns | 1.23 | 0.08 | 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.Collections.CtorGivenSize*'
```

### System.Collections.CtorGivenSize<Int32>.List(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorGivenSize<Int32>.Array(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorGivenSize<Int32>.Queue(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorGivenSize<Int32>.SortedList(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorGivenSize<Int32>.Stack(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 | [21d1570e075a895f62c292a5e1854947b97c7dbc](https://github.com/dotnet/runtime/commit/21d1570e075a895f62c292a5e1854947b97c7dbc)
Compare | [f397c835cc1c655505d2a22fd0cebb9e96733d0b](https://github.com/dotnet/runtime/commit/f397c835cc1c655505d2a22fd0cebb9e96733d0b)
Diff | [Diff](https://github.com/dotnet/runtime/compare/21d1570e075a895f62c292a5e1854947b97c7dbc...f397c835cc1c655505d2a22fd0cebb9e96733d0b)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

  • [Array - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 167.52 ns | 224.22 ns | 1.34 | 0.07 | False | | |
|
  • [List - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 362.21 ns | 470.87 ns | 1.30 | 0.07 | False | | |
|
  • [Stack - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 397.09 ns | 508.78 ns | 1.28 | 0.02 | False | | |
|
  • [Queue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 395.21 ns | 494.43 ns | 1.25 | 0.06 | False | | |
|
  • [SortedList - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 966.50 ns | 1134.95 ns | 1.17 | 0.07 | 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.Collections.CtorGivenSize*'
```

### System.Collections.CtorGivenSize<String>.Array(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorGivenSize<String>.List(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorGivenSize<String>.Stack(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorGivenSize<String>.Queue(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorGivenSize<String>.SortedList(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 | [21d1570e075a895f62c292a5e1854947b97c7dbc](https://github.com/dotnet/runtime/commit/21d1570e075a895f62c292a5e1854947b97c7dbc)
Compare | [f397c835cc1c655505d2a22fd0cebb9e96733d0b](https://github.com/dotnet/runtime/commit/f397c835cc1c655505d2a22fd0cebb9e96733d0b)
Diff | [Diff](https://github.com/dotnet/runtime/compare/21d1570e075a895f62c292a5e1854947b97c7dbc...f397c835cc1c655505d2a22fd0cebb9e96733d0b)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Collections.CtorGivenSizeNonGeneric

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

  • [ArrayList - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 351.59 ns | 453.72 ns | 1.29 | 0.04 | False | | |
|
  • [Stack - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 406.41 ns | 493.78 ns | 1.21 | 0.08 | False | | |
|
  • [Queue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 583.46 ns | 666.59 ns | 1.14 | 0.14 | False | | |
|
  • [SortedList - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.57 μs | 1.75 μs | 1.12 | 0.13 | False | | |

![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.Collections.CtorGivenSizeNonGeneric*'
```

### System.Collections.CtorGivenSizeNonGeneric.ArrayList(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorGivenSizeNonGeneric.Stack(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorGivenSizeNonGeneric.Queue(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorGivenSizeNonGeneric.SortedList(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 | [21d1570e075a895f62c292a5e1854947b97c7dbc](https://github.com/dotnet/runtime/commit/21d1570e075a895f62c292a5e1854947b97c7dbc)
Compare | [f397c835cc1c655505d2a22fd0cebb9e96733d0b](https://github.com/dotnet/runtime/commit/f397c835cc1c655505d2a22fd0cebb9e96733d0b)
Diff | [Diff](https://github.com/dotnet/runtime/compare/21d1570e075a895f62c292a5e1854947b97c7dbc...f397c835cc1c655505d2a22fd0cebb9e96733d0b)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

  • [ConcurrentQueue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 700.47 μs | 1251.71 μs | 1.79 | 0.23 | False | | |
|
  • [ConcurrentStack - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 524.18 μs | 820.52 μs | 1.57 | 0.24 | False | | |
|
  • [SortedDictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 20.30 ms | 29.89 ms | 1.47 | 0.37 | False | | |
|
  • [ImmutableSortedSet - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 17.65 ms | 24.69 ms | 1.40 | 0.30 | False | | |

![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.Collections.CtorFromCollection*'
```

### System.Collections.CtorFromCollection<String>.ConcurrentQueue(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorFromCollection<String>.ConcurrentStack(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorFromCollection<String>.SortedDictionary(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorFromCollection<String>.ImmutableSortedSet(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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