dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/arm64: 8 Regressions on 5/19/2026 2:09:19 AM +00:00

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ampere arch-arm64 bdn-update branch-11.0 compilationmode-tiered kind-fsharpmicro os-linux perf-regression runkind-fsharpmicro runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [f99b26797b5d3d673f6c37ce3a19fe4117ecded2](https://github.com/dotnet/sdk/commit/f99b26797b5d3d673f6c37ce3a19fe4117ecded2)
Compare | [6fa530d10e7077f6e8ba7620f668d46727fe955d](https://github.com/dotnet/sdk/commit/6fa530d10e7077f6e8ba7620f668d46727fe955d)
Diff | [Diff](https://github.com/dotnet/sdk/compare/f99b26797b5d3d673f6c37ce3a19fe4117ecded2...6fa530d10e7077f6e8ba7620f668d46727fe955d)
Configs | CompilationMode:tiered, RunKind:fsharpmicro

### Regressions in MicroBenchmarks.FSharp.Collections+CollectionsBenchmark

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

  • [ListUpdateEnd - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 103.13 μs | 159.49 μs | 1.55 | 0.60 | False | | |
|
  • [ArrayRemoveAtEnd - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 2.28 μs | 2.46 μs | 1.08 | 0.01 | False | | |
|
  • [ArrayInsertAtBeginning - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 2.37 μs | 2.54 μs | 1.07 | 0.01 | False | | |
|
  • [ArrayInsertManyAtBeginning - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 2.60 μs | 2.77 μs | 1.06 | 0.01 | False | | |
|
  • [ArrayUpdateAtBeginning - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 2.40 μs | 2.54 μs | 1.06 | 0.01 | False | | |
|
  • [ArrayRemoveAtBeginning - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 2.36 μs | 2.49 μs | 1.06 | 0.01 | False | | |
|
  • [ArrayInsertManyAtEnd - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 2.62 μs | 2.75 μs | 1.05 | 0.01 | 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 'MicroBenchmarks.FSharp.Collections+CollectionsBenchmark*'
```

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ListUpdateEnd(Length: 10000)

#### ETL Files

#### Histogram

#### JIT Disasms

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ArrayRemoveAtEnd(Length: 10000)

#### ETL Files

#### Histogram

#### JIT Disasms

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ArrayInsertAtBeginning(Length: 10000)

#### ETL Files

#### Histogram

#### JIT Disasms

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ArrayInsertManyAtBeginning(Length: 10000)

#### ETL Files

#### Histogram

#### JIT Disasms

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ArrayUpdateAtBeginning(Length: 10000)

#### ETL Files

#### Histogram

#### JIT Disasms

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ArrayRemoveAtBeginning(Length: 10000)

#### ETL Files

#### Histogram

#### JIT Disasms

### MicroBenchmarks.FSharp.Collections+CollectionsBenchmark.ArrayInsertManyAtEnd(Length: 10000)

#### 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 | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [f99b26797b5d3d673f6c37ce3a19fe4117ecded2](https://github.com/dotnet/sdk/commit/f99b26797b5d3d673f6c37ce3a19fe4117ecded2)
Compare | [6fa530d10e7077f6e8ba7620f668d46727fe955d](https://github.com/dotnet/sdk/commit/6fa530d10e7077f6e8ba7620f668d46727fe955d)
Diff | [Diff](https://github.com/dotnet/sdk/compare/f99b26797b5d3d673f6c37ce3a19fe4117ecded2...6fa530d10e7077f6e8ba7620f668d46727fe955d)
Configs | CompilationMode:tiered, RunKind:fsharpmicro

### Regressions in MicroBenchmarks.FSharp.Equality.FSharpCoreFunctions+FSharpCoreFunctions

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

  • [SeqCountBy - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 191.22 μs | 209.84 μs | 1.10 | 0.36 | 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 'MicroBenchmarks.FSharp.Equality.FSharpCoreFunctions+FSharpCoreFunctions*'
```

### MicroBenchmarks.FSharp.Equality.FSharpCoreFunctions+FSharpCoreFunctions.SeqCountBy

#### 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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