dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 7 Regressions on 5/21/2026 10:24:02 AM +00:00

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aot-true arch-wasm arch-x64 branch-refs/heads/main compilationmode-wasm kind-micro os-linux perf-regression runkind-micro untriaged wasm-aot
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [2a65f102aaad2e0b97bf4554dd510ae57801ae5e](https://github.com/dotnet/runtime/commit/2a65f102aaad2e0b97bf4554dd510ae57801ae5e)
Compare | [b77e008c4bd457ef29c4af17bfc99a7525949185](https://github.com/dotnet/runtime/commit/b77e008c4bd457ef29c4af17bfc99a7525949185)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2a65f102aaad2e0b97bf4554dd510ae57801ae5e...b77e008c4bd457ef29c4af17bfc99a7525949185)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

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

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

  • [Span - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 182.59 ns | 280.43 ns | 1.54 | 0.15 | False | | |
|
  • [IList - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.29 μs | 4.71 μs | 1.10 | 0.15 | False | | |
|
  • [OrderedDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 2.42 μs | 2.60 μs | 1.07 | 0.02 | False | | |

![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.IterateFor*'
```

### System.Collections.IterateFor<String>.Span(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.IterateFor<String>.IList(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.IterateFor<String>.OrderedDictionary(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 | [2a65f102aaad2e0b97bf4554dd510ae57801ae5e](https://github.com/dotnet/runtime/commit/2a65f102aaad2e0b97bf4554dd510ae57801ae5e)
Compare | [b77e008c4bd457ef29c4af17bfc99a7525949185](https://github.com/dotnet/runtime/commit/b77e008c4bd457ef29c4af17bfc99a7525949185)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2a65f102aaad2e0b97bf4554dd510ae57801ae5e...b77e008c4bd457ef29c4af17bfc99a7525949185)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Runtime.Intrinsics.Tests.Perf_Vector128Int

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

  • [NegateBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.40 ns | 37.50 ns | 26.79 | 0.39 | False | | |
|
  • [AddOperatorBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.50 ns | 4.84 ns | 1.93 | 0.44 | 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.Runtime.Intrinsics.Tests.Perf_Vector128Int*'
```

### System.Runtime.Intrinsics.Tests.Perf_Vector128Int.NegateBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Runtime.Intrinsics.Tests.Perf_Vector128Int.AddOperatorBenchmark

#### 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 | [2a65f102aaad2e0b97bf4554dd510ae57801ae5e](https://github.com/dotnet/runtime/commit/2a65f102aaad2e0b97bf4554dd510ae57801ae5e)
Compare | [b77e008c4bd457ef29c4af17bfc99a7525949185](https://github.com/dotnet/runtime/commit/b77e008c4bd457ef29c4af17bfc99a7525949185)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2a65f102aaad2e0b97bf4554dd510ae57801ae5e...b77e008c4bd457ef29c4af17bfc99a7525949185)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Runtime.Intrinsics.Tests.Perf_Vector128Of<Int16>

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

  • [LessThanBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.54 ns | 4.79 ns | 1.88 | 0.50 | False | | |
|
  • [ConditionalSelectBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.27 ns | 5.00 ns | 1.53 | 0.49 | 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.Runtime.Intrinsics.Tests.Perf_Vector128Of*'
```

### System.Runtime.Intrinsics.Tests.Perf_Vector128Of<Int16>.LessThanBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Runtime.Intrinsics.Tests.Perf_Vector128Of<Int16>.ConditionalSelectBenchmark

#### 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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Assessment

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