dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 19 Regressions on 4/28/2026 9:27:00 PM +00:00

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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [6130a50fcc846296d5c722b8e78c3bd292519eaa](https://github.com/dotnet/runtime/commit/6130a50fcc846296d5c722b8e78c3bd292519eaa)
Compare | [977f4125aa7cf8fd550f1bb91e966f20a1df6e54](https://github.com/dotnet/runtime/commit/977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6130a50fcc846296d5c722b8e78c3bd292519eaa...977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Tests.Perf_String

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

  • [Trim - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.00 μs | 3.63 μs | 1.21 | 0.34 | False | | |
|
  • [Replace_Char - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.58 μs | 3.11 μs | 1.21 | 0.29 | False | | |
|
  • [Insert - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.12 μs | 2.52 μs | 1.19 | 0.19 | False | | |
|
  • [Concat_str_str - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 10.96 μs | 12.14 μs | 1.11 | 0.22 | False | | |
|
  • [Concat_str_str_str_str - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 21.60 μs | 23.64 μs | 1.09 | 0.24 | False | | |
|
  • [Concat_str_str_str - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 16.27 μs | 17.68 μs | 1.09 | 0.19 | False | | |

![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 'System.Tests.Perf_String*'
```

### System.Tests.Perf_String.Trim(s: " Test")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.Replace_Char(text: "This is a very nice sentence", oldChar: 'z', newChar: 'y')

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.Insert(s1: "Test", i: 2, s2: " Test")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.Concat_str_str(size: 1000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.Concat_str_str_str_str(size: 1000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.Concat_str_str_str(size: 1000)

#### 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 | [6130a50fcc846296d5c722b8e78c3bd292519eaa](https://github.com/dotnet/runtime/commit/6130a50fcc846296d5c722b8e78c3bd292519eaa)
Compare | [977f4125aa7cf8fd550f1bb91e966f20a1df6e54](https://github.com/dotnet/runtime/commit/977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6130a50fcc846296d5c722b8e78c3bd292519eaa...977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Linq.Tests.Perf_Enumerable

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

  • [SelectToList - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 32.18 μs | 51.67 μs | 1.61 | 0.23 | False | | |
|
  • [TakeLastHalf - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 17.32 μs | 19.15 μs | 1.11 | 0.23 | False | | |
|
  • [AnyWithPredicate_LastElementMatches - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 14.40 μs | 15.47 μs | 1.07 | 0.37 | False | | |
|
  • [SelectToArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 44.34 μs | 47.44 μs | 1.07 | 0.15 | False | | |
|
  • [WhereSingle_LastElementMatches - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 15.23 μs | 16.28 μs | 1.07 | 0.15 | 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.Linq.Tests.Perf_Enumerable*'
```

### System.Linq.Tests.Perf_Enumerable.SelectToList(input: IEnumerable)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Linq.Tests.Perf_Enumerable.TakeLastHalf(input: List)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Linq.Tests.Perf_Enumerable.AnyWithPredicate_LastElementMatches(input: List)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Linq.Tests.Perf_Enumerable.SelectToArray(input: Array)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Linq.Tests.Perf_Enumerable.WhereSingle_LastElementMatches(input: Array)

#### 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 | [6130a50fcc846296d5c722b8e78c3bd292519eaa](https://github.com/dotnet/runtime/commit/6130a50fcc846296d5c722b8e78c3bd292519eaa)
Compare | [977f4125aa7cf8fd550f1bb91e966f20a1df6e54](https://github.com/dotnet/runtime/commit/977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6130a50fcc846296d5c722b8e78c3bd292519eaa...977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

  • [ArrayAsSpanStartLength - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 145.27 ns | 214.69 ns | 1.48 | 0.52 | False | | |
|
  • [SpanFromArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 82.30 ns | 95.43 ns | 1.16 | 0.54 | 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.Memory.Constructors*'
```

### System.Memory.Constructors<Byte>.ArrayAsSpanStartLength

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Constructors<Byte>.SpanFromArray

#### 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 | [6130a50fcc846296d5c722b8e78c3bd292519eaa](https://github.com/dotnet/runtime/commit/6130a50fcc846296d5c722b8e78c3bd292519eaa)
Compare | [977f4125aa7cf8fd550f1bb91e966f20a1df6e54](https://github.com/dotnet/runtime/commit/977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6130a50fcc846296d5c722b8e78c3bd292519eaa...977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in Loops.StrengthReduction

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

  • [SumS12Span - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.25 ms | 1.70 ms | 1.36 | 0.41 | False | | |
|
  • [SumS16Span - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.27 ms | 1.37 ms | 1.08 | 0.36 | 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 'Loops.StrengthReduction*'
```

### Loops.StrengthReduction.SumS12Span

#### ETL Files

#### Histogram

#### JIT Disasms

### Loops.StrengthReduction.SumS16Span

#### 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 | [3ac6e13b2780bbaf03c62488fced60b9a76e9782](https://github.com/dotnet/runtime/commit/3ac6e13b2780bbaf03c62488fced60b9a76e9782)
Compare | [977f4125aa7cf8fd550f1bb91e966f20a1df6e54](https://github.com/dotnet/runtime/commit/977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Diff | [Diff](https://github.com/dotnet/runtime/compare/3ac6e13b2780bbaf03c62488fced60b9a76e9782...977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.IO.Tests.StreamReaderReadToEndTests

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

  • [ReadToEnd - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.77 secs | 4.04 secs | 1.07 | 0.10 | False | | |
|
  • [ReadToEnd - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.80 secs | 4.06 secs | 1.07 | 0.10 | 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.IO.Tests.StreamReaderReadToEndTests*'
```

### System.IO.Tests.StreamReaderReadToEndTests.ReadToEnd(LineLengthRange: [1025, 2048])

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.StreamReaderReadToEndTests.ReadToEnd(LineLengthRange: [ 129, 1024])

#### 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 | [6130a50fcc846296d5c722b8e78c3bd292519eaa](https://github.com/dotnet/runtime/commit/6130a50fcc846296d5c722b8e78c3bd292519eaa)
Compare | [977f4125aa7cf8fd550f1bb91e966f20a1df6e54](https://github.com/dotnet/runtime/commit/977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6130a50fcc846296d5c722b8e78c3bd292519eaa...977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
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
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [ThrowAndCatchDeepRecursive - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 15.91 μs | 18.54 μs | 1.17 | 0.21 | 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 'Exceptions.Handling*'
```

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

#### 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 | [6130a50fcc846296d5c722b8e78c3bd292519eaa](https://github.com/dotnet/runtime/commit/6130a50fcc846296d5c722b8e78c3bd292519eaa)
Compare | [977f4125aa7cf8fd550f1bb91e966f20a1df6e54](https://github.com/dotnet/runtime/commit/977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6130a50fcc846296d5c722b8e78c3bd292519eaa...977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in MicroBenchmarks.Serializers.Xml_FromStream<Location>

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

  • [DataContractSerializer_ - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 404.70 μs | 436.94 μs | 1.08 | 0.24 | 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 'MicroBenchmarks.Serializers.Xml_FromStream*'
```

### MicroBenchmarks.Serializers.Xml_FromStream<Location>.DataContractSerializer_

#### 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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