dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x86: 8 Regressions on 4/12/2026 2:20:28 AM +00:00

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arch-x86 branch-refs/heads/main compilationmode-tiered kind-micro os-windows perf-regression runkind-micro runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [e583c98763e224e5d6587a9d8fc732a33b1d808b](https://github.com/dotnet/runtime/commit/e583c98763e224e5d6587a9d8fc732a33b1d808b)
Compare | [6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e](https://github.com/dotnet/runtime/commit/6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e)
Diff | [Diff](https://github.com/dotnet/runtime/compare/e583c98763e224e5d6587a9d8fc732a33b1d808b...6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Text.Json.Tests.Perf_Strings

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

  • [WriteStringsUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.68 ms | 3.02 ms | 1.13 | 0.01 | False | | |
|
  • [WriteStringsUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.29 ms | 2.57 ms | 1.12 | 0.01 | False | | |
|
  • [WriteStringsUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.39 ms | 2.67 ms | 1.12 | 0.01 | False | | |
|
  • [WriteStringsUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.79 ms | 3.11 ms | 1.11 | 0.01 | False | | |
|
  • [WriteStringsUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.78 ms | 6.15 ms | 1.06 | 0.01 | False | | |
|
  • [WriteStringsUtf8 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.21 ms | 6.59 ms | 1.06 | 0.02 | False | | |

[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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Tests.Perf_Strings*'
```

### System.Text.Json.Tests.Perf_Strings.WriteStringsUtf8(Formatted: True, SkipValidation: True, Escaped: NoneEscaped)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Tests.Perf_Strings.WriteStringsUtf8(Formatted: False, SkipValidation: True, Escaped: NoneEscaped)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Tests.Perf_Strings.WriteStringsUtf8(Formatted: False, SkipValidation: False, Escaped: NoneEscaped)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Tests.Perf_Strings.WriteStringsUtf8(Formatted: True, SkipValidation: False, Escaped: NoneEscaped)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Tests.Perf_Strings.WriteStringsUtf8(Formatted: False, SkipValidation: True, Escaped: OneEscaped)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Tests.Perf_Strings.WriteStringsUtf8(Formatted: True, SkipValidation: True, Escaped: OneEscaped)

#### 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 | x86
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [280fb749167d6b0a42c9e5f90dc9b29730a09dac](https://github.com/dotnet/runtime/commit/280fb749167d6b0a42c9e5f90dc9b29730a09dac)
Compare | [6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e](https://github.com/dotnet/runtime/commit/6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e)
Diff | [Diff](https://github.com/dotnet/runtime/compare/280fb749167d6b0a42c9e5f90dc9b29730a09dac...6df558c6c4b6b13d3f40c21ac7d61cf7bc13b96e)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Text.Json.Document.Tests.Perf_ParseThenWrite

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

  • [ParseThenWrite - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 191.13 ns | 204.21 ns | 1.07 | 0.06 | False | | |
|
  • [ParseThenWrite - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 886.59 μs | 945.43 μs | 1.07 | 0.02 | False | | |

[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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Document.Tests.Perf_ParseThenWrite*'
```

### System.Text.Json.Document.Tests.Perf_ParseThenWrite.ParseThenWrite(IsDataIndented: False, TestCase: HelloWorld)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Document.Tests.Perf_ParseThenWrite.ParseThenWrite(IsDataIndented: False, TestCase: Json400KB)

#### 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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