dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 9 Improvements on 6/18/2026 2:00:10 PM +00:00

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arch-wasm arch-x64 branch-refs/heads/main compilationmode-wasm kind-micro Look Again os-linux perf-improvement runkind-micro runtimetype-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [8f2341959451d05a276af3760b45b16310a19baf](https://github.com/dotnet/runtime/commit/8f2341959451d05a276af3760b45b16310a19baf)
Compare | [b1ea6ff8a102c76f5f8ffdf55a8a2a7fc40de61b](https://github.com/dotnet/runtime/commit/b1ea6ff8a102c76f5f8ffdf55a8a2a7fc40de61b)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8f2341959451d05a276af3760b45b16310a19baf...b1ea6ff8a102c76f5f8ffdf55a8a2a7fc40de61b)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Improvements in System.Tests.Perf_Byte

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]()
| 2.82 μs | 1.86 μs | 0.66 | 0.27 | False | | |
|
  • [TryParse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1473.21 ns | 972.97 ns | 0.66 | 0.21 | False | | |
|
  • [Parse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.41 μs | 1.04 μs | 0.73 | 0.25 | False | | |
|
  • [TryParse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.33 μs | 1.75 μs | 0.75 | 0.21 | False | | |
|
  • [ToString - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 192.38 ns | 161.45 ns | 0.84 | 0.21 | False | | |

![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.Tests.Perf_Byte*'
```

### System.Tests.Perf_Byte.Parse(value: "255")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Byte.TryParse(value: "0")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Byte.Parse(value: "0")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Byte.TryParse(value: "255")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Byte.ToString(value: 255)

#### 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 | [8f2341959451d05a276af3760b45b16310a19baf](https://github.com/dotnet/runtime/commit/8f2341959451d05a276af3760b45b16310a19baf)
Compare | [b1ea6ff8a102c76f5f8ffdf55a8a2a7fc40de61b](https://github.com/dotnet/runtime/commit/b1ea6ff8a102c76f5f8ffdf55a8a2a7fc40de61b)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8f2341959451d05a276af3760b45b16310a19baf...b1ea6ff8a102c76f5f8ffdf55a8a2a7fc40de61b)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Improvements in System.Collections.ContainsTrue<String>

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

  • [Span - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 290.04 ms | 129.87 ms | 0.45 | 0.33 | False | | |
|
  • [ICollection - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 19.43 ms | 16.09 ms | 0.83 | 0.32 | False | | |
|
  • [Queue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 18.94 ms | 16.06 ms | 0.85 | 0.32 | 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.Collections.ContainsTrue*'
```

### System.Collections.ContainsTrue<String>.Span(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.ContainsTrue<String>.ICollection(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.ContainsTrue<String>.Queue(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 | [8f2341959451d05a276af3760b45b16310a19baf](https://github.com/dotnet/runtime/commit/8f2341959451d05a276af3760b45b16310a19baf)
Compare | [b1ea6ff8a102c76f5f8ffdf55a8a2a7fc40de61b](https://github.com/dotnet/runtime/commit/b1ea6ff8a102c76f5f8ffdf55a8a2a7fc40de61b)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8f2341959451d05a276af3760b45b16310a19baf...b1ea6ff8a102c76f5f8ffdf55a8a2a7fc40de61b)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Improvements in System.Collections.ContainsKeyFalse<String, String>

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

  • [ImmutableSortedDictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 18.68 ms | 13.67 ms | 0.73 | 0.27 | 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.ContainsKeyFalse*'
```

### System.Collections.ContainsKeyFalse<String, String>.ImmutableSortedDictionary(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 listed benchmark sources, src/benchmarks/micro/libraries/System.Runtime/Perf.Byte.cs and src/benchmarks/micro/libraries/System.Collections/Contains/ContainsTrue.cs, then run the provided benchmarks_ci.py command using the benchmarking workflow documentation. Compare the reported results and determine whether the improvements indicate an actionable runtime issue; done requires a confirmed cause or a clearly documented follow-up.

Written by the indexing model from the issue text.

Assessment

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

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