dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 36 Regressions on 5/1/2026 6:40:56 AM +00:00

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arch-wasm arch-x64 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 | [e971c0ad9289befbd7e4ebf2af4186b96f3bada8](https://github.com/dotnet/runtime/commit/e971c0ad9289befbd7e4ebf2af4186b96f3bada8)
Compare | [8e7e7589051881332c387c46760773d1caed5712](https://github.com/dotnet/runtime/commit/8e7e7589051881332c387c46760773d1caed5712)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e971c0ad9289befbd7e4ebf2af4186b96f3bada8...8e7e7589051881332c387c46760773d1caed5712)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Memory.Span<Int32>

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

  • [ToArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 855.25 ns | 1208.80 ns | 1.41 | 0.32 | False | | |
|
  • [CopyToSame - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 420.99 ns | 535.44 ns | 1.27 | 0.45 | False | | |
|
  • [IndexOfAnyFiveValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.28 μs | 1.49 μs | 1.17 | 0.47 | False | | |
|
  • [LastIndexOfAnyValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 135.63 μs | 156.81 μs | 1.16 | 0.41 | False | | |
|
  • [IndexOfAnyThreeValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 30.57 μs | 35.33 μs | 1.16 | 0.36 | False | | |
|
  • [IndexOfAnyThreeValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 183.52 μs | 210.80 μs | 1.15 | 0.33 | False | | |
|
  • [IndexOfAnyFiveValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.91 μs | 7.92 μs | 1.15 | 0.55 | False | | |
|
  • [IndexOfAnyFiveValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 103.53 μs | 118.30 μs | 1.14 | 0.51 | False | | |
|
  • [LastIndexOfAnyValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 456.98 ns | 521.11 ns | 1.14 | 0.37 | False | | |
|
  • [IndexOfValue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 20.50 μs | 23.30 μs | 1.14 | 0.27 | False | | |
|
  • [EndsWith - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 36.26 μs | 41.08 μs | 1.13 | 0.33 | False | | |
|
  • [StartsWith - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 209.29 μs | 235.51 μs | 1.13 | 0.38 | False | | |
|
  • [LastIndexOfValue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 120.63 μs | 135.05 μs | 1.12 | 0.35 | False | | |
|
  • [IndexOfAnyFiveValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 619.88 μs | 686.07 μs | 1.11 | 0.43 | False | | |
|
  • [StartsWith - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 36.94 μs | 40.71 μs | 1.10 | 0.28 | False | | |
|
  • [Clear - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 496.76 ns | 546.64 ns | 1.10 | 0.36 | False | | |
|
  • [IndexOfAnyTwoValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.93 μs | 2.11 μs | 1.10 | 0.38 | False | | |
|
  • [LastIndexOfValue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 21.18 μs | 23.18 μs | 1.09 | 0.33 | False | | |
|
  • [SequenceEqual - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 74.30 μs | 81.27 μs | 1.09 | 0.34 | False | | |
|
  • [CopyToSame - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 442.85 ns | 484.33 ns | 1.09 | 0.33 | False | | |
|
  • [IndexOfAnyTwoValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 142.31 μs | 155.25 μs | 1.09 | 0.32 | False | | |
|
  • [StartsWith - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 890.47 ns | 969.06 ns | 1.09 | 0.35 | False | | |
|
  • [IndexOfValue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.81 μs | 1.96 μs | 1.08 | 0.32 | False | | |
|
  • [BinarySearch - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.74 μs | 1.88 μs | 1.08 | 0.42 | False | | |
|
  • [IndexOfValue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 692.81 ns | 747.87 ns | 1.08 | 0.38 | False | | |
|
  • [SequenceCompareTo - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 412.00 μs | 444.15 μs | 1.08 | 0.53 | False | | |
|
  • [LastIndexOfAnyValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.94 μs | 2.09 μs | 1.08 | 0.37 | False | | |
|
  • [Fill - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.48 μs | 1.59 μs | 1.07 | 0.34 | False | | |
|
  • [Fill - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 113.34 μs | 121.58 μs | 1.07 | 0.36 | False | | |
|
  • [Clear - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 338.41 ns | 361.55 ns | 1.07 | 0.35 | False | | |
|
  • [Clear - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 406.57 ns | 433.86 ns | 1.07 | 0.38 | False | | |
|
  • [CopyToOverlap - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 663.45 ns | 704.34 ns | 1.06 | 0.31 | False | | |
|
  • [CopyToOverlap - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 847.71 ns | 898.29 ns | 1.06 | 0.20 | False | | |

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[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.Span*'
```

### System.Memory.Span<Int32>.ToArray(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.CopyToSame(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyFiveValues(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.LastIndexOfAnyValues(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyThreeValues(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyThreeValues(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyFiveValues(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyFiveValues(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.LastIndexOfAnyValues(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfValue(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.EndsWith(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.StartsWith(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.LastIndexOfValue(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyFiveValues(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.StartsWith(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.Clear(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyTwoValues(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.LastIndexOfValue(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.SequenceEqual(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.CopyToSame(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfAnyTwoValues(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.StartsWith(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfValue(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.BinarySearch(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.IndexOfValue(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.SequenceCompareTo(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.LastIndexOfAnyValues(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.Fill(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.Fill(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.Clear(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.Clear(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.CopyToOverlap(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Int32>.CopyToOverlap(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 | [e971c0ad9289befbd7e4ebf2af4186b96f3bada8](https://github.com/dotnet/runtime/commit/e971c0ad9289befbd7e4ebf2af4186b96f3bada8)
Compare | [8e7e7589051881332c387c46760773d1caed5712](https://github.com/dotnet/runtime/commit/8e7e7589051881332c387c46760773d1caed5712)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e971c0ad9289befbd7e4ebf2af4186b96f3bada8...8e7e7589051881332c387c46760773d1caed5712)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Text.Json.Document.Tests.Perf_EnumerateObject

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

  • [Parse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.80 ms | 3.10 ms | 1.10 | 0.29 | False | | |
|
  • [Parse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 131.25 ms | 143.38 ms | 1.09 | 0.32 | False | | |
|
  • [PropertyIndexer - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 518.50 μs | 565.36 μs | 1.09 | 0.28 | 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.Text.Json.Document.Tests.Perf_EnumerateObject*'
```

### System.Text.Json.Document.Tests.Perf_EnumerateObject.Parse(TestCase: NumericProperties)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Document.Tests.Perf_EnumerateObject.Parse(TestCase: ObjectProperties)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Document.Tests.Perf_EnumerateObject.PropertyIndexer(TestCase: NumericProperties)

#### 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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