dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 14 Regressions on 9/10/2026 4:07:17 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 | [27ac7f0dea0445c51dc4ab5ca44ad3a93926c56e](https://github.com/dotnet/runtime/commit/27ac7f0dea0445c51dc4ab5ca44ad3a93926c56e)
Compare | [83aa91afb0ac94f86d33f0ef02aea79a2fe6e31a](https://github.com/dotnet/runtime/commit/83aa91afb0ac94f86d33f0ef02aea79a2fe6e31a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/27ac7f0dea0445c51dc4ab5ca44ad3a93926c56e...83aa91afb0ac94f86d33f0ef02aea79a2fe6e31a)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Numerics.Tests.Perf_Vector3

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

  • [LengthBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.84 μs | 15.36 μs | 3.17 | 0.19 | False | | |
|
  • [LengthSquaredBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.77 μs | 13.80 μs | 2.89 | 0.16 | False | | |
|
  • [DotBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.51 μs | 14.27 μs | 2.59 | 0.16 | False | | |
|
  • [NormalizeBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.15 μs | 20.20 μs | 2.48 | 0.15 | False | | |
|
  • [DistanceBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.07 μs | 17.40 μs | 2.16 | 0.15 | False | | |
|
  • [DistanceSquaredBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 7.98 μs | 16.45 μs | 2.06 | 0.13 | False | | |
|
  • [ReflectBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 14.48 μs | 21.82 μs | 1.51 | 0.12 | False | | |

![graph]()
![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.Numerics.Tests.Perf_Vector3*'
```

### System.Numerics.Tests.Perf_Vector3.LengthBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Vector3.LengthSquaredBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Vector3.DotBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Vector3.NormalizeBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Vector3.DistanceBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Vector3.DistanceSquaredBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Vector3.ReflectBenchmark

#### 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 | [27ac7f0dea0445c51dc4ab5ca44ad3a93926c56e](https://github.com/dotnet/runtime/commit/27ac7f0dea0445c51dc4ab5ca44ad3a93926c56e)
Compare | [83aa91afb0ac94f86d33f0ef02aea79a2fe6e31a](https://github.com/dotnet/runtime/commit/83aa91afb0ac94f86d33f0ef02aea79a2fe6e31a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/27ac7f0dea0445c51dc4ab5ca44ad3a93926c56e...83aa91afb0ac94f86d33f0ef02aea79a2fe6e31a)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Numerics.Tests.Perf_Vector2

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

  • [LengthBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.04 μs | 8.74 μs | 1.73 | 0.17 | False | | |
|
  • [LengthSquaredBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.06 μs | 8.76 μs | 1.73 | 0.15 | False | | |
|
  • [DotBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.88 μs | 9.02 μs | 1.53 | 0.21 | False | | |
|
  • [NormalizeBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.69 μs | 13.29 μs | 1.53 | 0.15 | False | | |
|
  • [DistanceBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.38 μs | 12.01 μs | 1.43 | 0.16 | False | | |
|
  • [DistanceSquaredBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.43 μs | 11.26 μs | 1.20 | 0.17 | False | | |
|
  • [ReflectBenchmark - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 13.81 μs | 15.34 μs | 1.11 | 0.15 | False | | |

![graph]()
![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.Numerics.Tests.Perf_Vector2*'
```

### System.Numerics.Tests.Perf_Vector2.LengthBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Vector2.LengthSquaredBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Vector2.DotBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Vector2.NormalizeBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Vector2.DistanceBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Vector2.DistanceSquaredBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tests.Perf_Vector2.ReflectBenchmark

#### 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 baseline and compare commits linked in the run information, then inspect the benchmark source at dotnet/performance/src/benchmarks/micro/libraries/System.Numerics.Vectors/Perf_Vector3.cs, especially the cited lines. Run or review the Length, LengthSquared, Dot, Normalize, Distance, DistanceSquared, and Reflect benchmark reports for the Linux/x64 WASM configuration. Done means identifying and addressing the regression so the affected benchmarks no longer show the reported slowdown.

Written by the indexing model from the issue text.

Assessment

Tech stack
wasm
Domain
performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Active
Clarity
Mostly clear
Newbie friendliness
42/100

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