[Perf] Linux/x64: 4 Improvements on 7/7/2026 8:36:41 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [079b4572b83e3b66031899e6bf3842e1b4da7231](https://github.com/dotnet/runtime/commit/079b4572b83e3b66031899e6bf3842e1b4da7231)
Compare | [5568a01aa964e9f6784490f9359135cc36d021fa](https://github.com/dotnet/runtime/commit/5568a01aa964e9f6784490f9359135cc36d021fa)
Diff | [Diff](https://github.com/dotnet/runtime/compare/079b4572b83e3b66031899e6bf3842e1b4da7231...5568a01aa964e9f6784490f9359135cc36d021fa)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.IO.Tests.StreamReaderReadLineTests

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

• [ReadLineAsync - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 33.82 μs | 28.26 μs | 0.84 | 0.23 | False | | |
|

• [ReadLineAsync - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 287.78 μs | 255.49 μs | 0.89 | 0.12 | False | | |
|

• [ReadLineAsync - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 10.73 μs | 9.82 μs | 0.92 | 0.07 | False | | |
|

• [ReadLineAsync - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 462.78 μs | 425.05 μs | 0.92 | 0.05 | 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.IO.Tests.StreamReaderReadLineTests*'
```

### System.IO.Tests.StreamReaderReadLineTests.ReadLineAsync(LineLengthRange: [ 9, 32])

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.StreamReaderReadLineTests.ReadLineAsync(LineLengthRange: [ 1, 1])

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.StreamReaderReadLineTests.ReadLineAsync(LineLengthRange: [ 33, 128])

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.StreamReaderReadLineTests.ReadLineAsync(LineLengthRange: [ 0, 0])

#### 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)

Start with src/benchmarks/micro/libraries/System.IO/StreamReaderReadLineTests.cs and run the supplied scripts/benchmarks_ci.py command for the ReadLineAsync benchmarks. Compare the reported baseline and test results with the linked report; the issue names no runtime file, requested change, or acceptance condition, so completion is not defined beyond investigating the performance data.

Written by the indexing model from the issue text.