dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 6 Regressions on 7/13/2026 8:32:42 PM +00:00

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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [a90733cc40d6c7037a37d9c2b5c2403b8cac490f](https://github.com/dotnet/runtime/commit/a90733cc40d6c7037a37d9c2b5c2403b8cac490f)
Compare | [f2b30309fd488f1c3fd41c18723a7c80a81f4c67](https://github.com/dotnet/runtime/commit/f2b30309fd488f1c3fd41c18723a7c80a81f4c67)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a90733cc40d6c7037a37d9c2b5c2403b8cac490f...f2b30309fd488f1c3fd41c18723a7c80a81f4c67)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Globalization.Tests.StringSearch

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

  • [IsPrefix_DifferentFirstChar - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 13.79 ΞΌs | 14.88 ΞΌs | 1.08 | 0.07 | False | | |
|
  • [IsPrefix_FirstHalf - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 7.49 ΞΌs | 7.96 ΞΌs | 1.06 | 0.06 | 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.Globalization.Tests.StringSearch*'
```

### System.Globalization.Tests.StringSearch.IsPrefix_DifferentFirstChar(Options: (en-US, IgnoreSymbols, False))

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Globalization.Tests.StringSearch.IsPrefix_FirstHalf(Options: (en-US, IgnoreSymbols, 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)

---

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [a90733cc40d6c7037a37d9c2b5c2403b8cac490f](https://github.com/dotnet/runtime/commit/a90733cc40d6c7037a37d9c2b5c2403b8cac490f)
Compare | [f2b30309fd488f1c3fd41c18723a7c80a81f4c67](https://github.com/dotnet/runtime/commit/f2b30309fd488f1c3fd41c18723a7c80a81f4c67)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a90733cc40d6c7037a37d9c2b5c2403b8cac490f...f2b30309fd488f1c3fd41c18723a7c80a81f4c67)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Tests.Perf_Enum

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

  • [ToString_Format_Flags_Large - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 79.40 ns | 84.52 ns | 1.06 | 0.10 | 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.Tests.Perf_Enum*'
```

### System.Tests.Perf_Enum.ToString_Format_Flags_Large(value: All, format: "x")

#### 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 | [a90733cc40d6c7037a37d9c2b5c2403b8cac490f](https://github.com/dotnet/runtime/commit/a90733cc40d6c7037a37d9c2b5c2403b8cac490f)
Compare | [f2b30309fd488f1c3fd41c18723a7c80a81f4c67](https://github.com/dotnet/runtime/commit/f2b30309fd488f1c3fd41c18723a7c80a81f4c67)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a90733cc40d6c7037a37d9c2b5c2403b8cac490f...f2b30309fd488f1c3fd41c18723a7c80a81f4c67)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Net.Tests.Perf_WebUtility

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

  • [Decode_NoDecodingRequired - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 101.25 ns | 128.37 ns | 1.27 | 0.04 | 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.Net.Tests.Perf_WebUtility*'
```

### System.Net.Tests.Perf_WebUtility.Decode_NoDecodingRequired

#### 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 | [a90733cc40d6c7037a37d9c2b5c2403b8cac490f](https://github.com/dotnet/runtime/commit/a90733cc40d6c7037a37d9c2b5c2403b8cac490f)
Compare | [f2b30309fd488f1c3fd41c18723a7c80a81f4c67](https://github.com/dotnet/runtime/commit/f2b30309fd488f1c3fd41c18723a7c80a81f4c67)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a90733cc40d6c7037a37d9c2b5c2403b8cac490f...f2b30309fd488f1c3fd41c18723a7c80a81f4c67)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

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

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

  • [List - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.98 ΞΌs | 2.17 ΞΌs | 1.10 | 0.07 | 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.Collections.IndexerSet*'
```

### System.Collections.IndexerSet<Int32>.List(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 | [a90733cc40d6c7037a37d9c2b5c2403b8cac490f](https://github.com/dotnet/runtime/commit/a90733cc40d6c7037a37d9c2b5c2403b8cac490f)
Compare | [f2b30309fd488f1c3fd41c18723a7c80a81f4c67](https://github.com/dotnet/runtime/commit/f2b30309fd488f1c3fd41c18723a7c80a81f4c67)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a90733cc40d6c7037a37d9c2b5c2403b8cac490f...f2b30309fd488f1c3fd41c18723a7c80a81f4c67)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Tests.Perf_Uri

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

  • [EscapeDataString - Duration of single invocation]()
  • πŸ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 20.56 ΞΌs | 24.50 ΞΌs | 1.19 | 0.10 | 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.Tests.Perf_Uri*'
```

### System.Tests.Perf_Uri.EscapeDataString(input: "ΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌΓΌ")

#### 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)

Contributor guide

No contributing guide indexed for this repository

Research direction

Start with the listed benchmark sources in dotnet/performance, including StringSearch.cs, Perf.Enum.cs, and Perf.WebUtility.cs, then use scripts/benchmarks_ci.py with the provided filters to reproduce the regressions. Compare the supplied baseline and test reports; done means the reported performance regressions are explained and the affected benchmarks have been rerun.

Written by the indexing model from the issue text.

Assessment

Tech stack
linux, python, ubuntu, wasm
Domain
performance, testing
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
35/100

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