dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 1019 Regressions on 4/28/2026 1:30:15 PM +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 | [3ac6e13b2780bbaf03c62488fced60b9a76e9782](https://github.com/dotnet/runtime/commit/3ac6e13b2780bbaf03c62488fced60b9a76e9782)
Compare | [1d02af45d41c1fefa5ec4c139295081092af0905](https://github.com/dotnet/runtime/commit/1d02af45d41c1fefa5ec4c139295081092af0905)
Diff | [Diff](https://github.com/dotnet/runtime/compare/3ac6e13b2780bbaf03c62488fced60b9a76e9782...1d02af45d41c1fefa5ec4c139295081092af0905)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

  • [Fill - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 109.76 μs | 131.26 μs | 1.20 | 0.36 | False | | |
|
  • [IndexOfValue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 22.91 μs | 26.90 μs | 1.17 | 0.30 | False | | |
|
  • [Reverse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 24.99 μs | 28.98 μs | 1.16 | 0.46 | False | | |
|
  • [Reverse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 802.95 ns | 920.28 ns | 1.15 | 0.31 | False | | |
|
  • [Clear - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 339.78 ns | 388.60 ns | 1.14 | 0.34 | False | | |
|
  • [StartsWith - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 642.90 ns | 734.82 ns | 1.14 | 0.40 | False | | |
|
  • [SequenceEqual - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 634.39 ns | 717.83 ns | 1.13 | 0.43 | False | | |
|
  • [Clear - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 413.33 ns | 467.51 ns | 1.13 | 0.38 | False | | |
|
  • [Reverse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.91 μs | 2.16 μs | 1.13 | 0.35 | False | | |
|
  • [IndexOfValue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 125.10 μs | 141.47 μs | 1.13 | 0.24 | False | | |
|
  • [SequenceEqual - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.74 μs | 1.96 μs | 1.12 | 0.31 | False | | |
|
  • [ToArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 850.69 ns | 951.07 ns | 1.12 | 0.28 | False | | |
|
  • [CopyToOverlap - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 657.16 ns | 731.88 ns | 1.11 | 0.37 | False | | |
|
  • [IndexOfAnyTwoValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 174.98 μs | 194.47 μs | 1.11 | 0.22 | False | | |
|
  • [BinarySearch - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.62 μs | 1.79 μs | 1.11 | 0.37 | False | | |
|
  • [Fill - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 20.45 μs | 22.60 μs | 1.11 | 0.48 | False | | |
|
  • [IndexOfAnyTwoValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 30.77 μs | 33.90 μs | 1.10 | 0.32 | False | | |
|
  • [SequenceEqual - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 18.50 μs | 20.32 μs | 1.10 | 0.34 | False | | |
|
  • [LastIndexOfAnyValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.50 μs | 2.74 μs | 1.09 | 0.29 | False | | |
|
  • [EndsWith - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 689.53 ns | 750.71 ns | 1.09 | 0.35 | False | | |
|
  • [EndsWith - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.34 μs | 1.46 μs | 1.09 | 0.32 | False | | |
|
  • [StartsWith - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.18 μs | 1.28 μs | 1.08 | 0.36 | False | | |
|
  • [LastIndexOfValue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.87 μs | 2.03 μs | 1.08 | 0.27 | False | | |
|
  • [CopyToOverlap - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 652.21 ns | 701.10 ns | 1.07 | 0.47 | False | | |
|
  • [IndexOfAnyThreeValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.06 μs | 1.13 μs | 1.07 | 0.24 | False | | |
|
  • [LastIndexOfAnyValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 31.48 μs | 33.58 μs | 1.07 | 0.33 | False | | |
|
  • [IndexOfAnyThreeValues - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 229.54 μs | 244.59 μs | 1.07 | 0.26 | False | | |
|
  • [SequenceCompareTo - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.76 μs | 1.88 μs | 1.06 | 0.39 | False | | |
|
  • [CopyToSame - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 447.27 ns | 473.92 ns | 1.06 | 0.25 | False | | |
|
  • [ToArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 716.32 ns | 754.19 ns | 1.05 | 0.29 | 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<Byte>.Fill(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.Reverse(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.Reverse(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.Clear(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.SequenceEqual(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.Reverse(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.IndexOfValue(Size: 3000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.SequenceEqual(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.ToArray(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.Fill(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.IndexOfAnyTwoValues(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.EndsWith(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.EndsWith(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.StartsWith(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.LastIndexOfValue(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.CopyToOverlap(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.IndexOfAnyThreeValues(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.LastIndexOfAnyValues(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span<Byte>.SequenceCompareTo(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### 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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