dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 7 Regressions on 8/26/2026 4:02:35 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 | [8baacb006f5615ebd705bdf9de98ca5df7bf1ba1](https://github.com/dotnet/runtime/commit/8baacb006f5615ebd705bdf9de98ca5df7bf1ba1)
Compare | [08df03ba6493589f3816e193847b50f105bf4c7a](https://github.com/dotnet/runtime/commit/08df03ba6493589f3816e193847b50f105bf4c7a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8baacb006f5615ebd705bdf9de98ca5df7bf1ba1...08df03ba6493589f3816e193847b50f105bf4c7a)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Buffers.Text.Tests.Utf8ParserTests

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

  • [TryParseDouble - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 59.42 ns | 69.44 ns | 1.17 | 0.09 | False | | |
|
  • [TryParseSingle - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 60.43 ns | 69.41 ns | 1.15 | 0.07 | False | | |
|
  • [TryParseDouble - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 97.24 ns | 105.46 ns | 1.08 | 0.11 | False | | |
|
  • [TryParseDouble - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 97.43 ns | 105.42 ns | 1.08 | 0.07 | False | | |

![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.Buffers.Text.Tests.Utf8ParserTests*'
```

### System.Buffers.Text.Tests.Utf8ParserTests.TryParseDouble(value: 12345)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Text.Tests.Utf8ParserTests.TryParseSingle(value: 12345)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Text.Tests.Utf8ParserTests.TryParseDouble(value: 1.7976931348623157e+308)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Text.Tests.Utf8ParserTests.TryParseDouble(value: -1.7976931348623157e+308)

#### 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 | [519e88bf80b5d39bc2c4e788a025a499136a1661](https://github.com/dotnet/runtime/commit/519e88bf80b5d39bc2c4e788a025a499136a1661)
Compare | [08df03ba6493589f3816e193847b50f105bf4c7a](https://github.com/dotnet/runtime/commit/08df03ba6493589f3816e193847b50f105bf4c7a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/519e88bf80b5d39bc2c4e788a025a499136a1661...08df03ba6493589f3816e193847b50f105bf4c7a)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Tests.Perf_Int64

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

  • [ToString - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 46.71 ns | 50.22 ns | 1.08 | 0.13 | 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 'System.Tests.Perf_Int64*'
```

### System.Tests.Perf_Int64.ToString(value: 12345)

#### 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 | [519e88bf80b5d39bc2c4e788a025a499136a1661](https://github.com/dotnet/runtime/commit/519e88bf80b5d39bc2c4e788a025a499136a1661)
Compare | [08df03ba6493589f3816e193847b50f105bf4c7a](https://github.com/dotnet/runtime/commit/08df03ba6493589f3816e193847b50f105bf4c7a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/519e88bf80b5d39bc2c4e788a025a499136a1661...08df03ba6493589f3816e193847b50f105bf4c7a)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

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

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

  • [IList - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.81 μs | 6.59 μs | 1.13 | 0.14 | 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 'System.Collections.IndexerSet*'
```

### System.Collections.IndexerSet<String>.IList(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 | [8baacb006f5615ebd705bdf9de98ca5df7bf1ba1](https://github.com/dotnet/runtime/commit/8baacb006f5615ebd705bdf9de98ca5df7bf1ba1)
Compare | [08df03ba6493589f3816e193847b50f105bf4c7a](https://github.com/dotnet/runtime/commit/08df03ba6493589f3816e193847b50f105bf4c7a)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8baacb006f5615ebd705bdf9de98ca5df7bf1ba1...08df03ba6493589f3816e193847b50f105bf4c7a)
Configs | AOT:true, CompilationMode:wasm, RunKind:micro

### Regressions in System.Collections.TryGetValueFalse<SmallClass, SmallClass>

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

  • [IDictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.15 μs | 9.76 μs | 1.07 | 0.05 | 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 'System.Collections.TryGetValueFalse*'
```

### System.Collections.TryGetValueFalse<SmallClass, SmallClass>.IDictionary(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)

Contributor guide

No contributing guide indexed for this repository

Research direction

Start with the linked benchmark sources, including dotnet/performance/src/benchmarks/micro/libraries/System.Buffers/Utf8ParserTests.cs and src/benchmarks/micro/libraries/System.Runtime/Perf.Int64.cs, then inspect the baseline-to-compare commit diff. Run benchmarks_ci.py with the listed filters and compare the reports. Done means the Linux/x64 WASM regressions are explained and the relevant performance result is restored or otherwise resolved.

Written by the indexing model from the issue text.

Assessment

Tech stack
git, python, wasm
Domain
performance, testing
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Active
Clarity
Needs clarification
Newbie friendliness
35/100

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