dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x86: 13 Regressions on 5/20/2026 9:51:13 AM +00:00

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arch-x86 bdn-update 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 | [21d1570e075a895f62c292a5e1854947b97c7dbc](https://github.com/dotnet/runtime/commit/21d1570e075a895f62c292a5e1854947b97c7dbc)
Compare | [a49d0cf4bb262a0bb8a2ece002155cd0a4829dbd](https://github.com/dotnet/runtime/commit/a49d0cf4bb262a0bb8a2ece002155cd0a4829dbd)
Diff | [Diff](https://github.com/dotnet/runtime/compare/21d1570e075a895f62c292a5e1854947b97c7dbc...a49d0cf4bb262a0bb8a2ece002155cd0a4829dbd)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Threading.Tasks.ValueTaskPerfTest

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

  • [Copy_PassAsArgumentAndReturn_FromValueTaskSource - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.38 ns | 13.10 ns | 1.56 | 0.04 | False | | |
|
  • [Copy_PassAsArgumentAndReturn_FromTask - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.01 ns | 9.15 ns | 1.52 | 0.02 | False | | |
|
  • [Copy_PassAsArgumentAndReturn_FromResult - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.00 ns | 7.38 ns | 1.48 | 0.01 | False | | |
|
  • [Await_FromResult - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.97 ns | 8.27 ns | 1.19 | 0.05 | False | | |
|
  • [CreateAndAwait_FromResult_ConfigureAwait - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.83 ns | 8.09 ns | 1.19 | 0.06 | False | | |
|
  • [CreateAndAwait_FromResult - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.83 ns | 8.09 ns | 1.19 | 0.03 | False | | |
|
  • [Await_FromCompletedTask - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 10.25 ns | 11.85 ns | 1.16 | 0.05 | False | | |
|
  • [CreateAndAwait_FromCompletedValueTaskSource_ConfigureAwait - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.28 ns | 10.63 ns | 1.15 | 0.03 | False | | |
|
  • [Await_FromCompletedValueTaskSource - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 15.56 ns | 16.68 ns | 1.07 | 0.07 | False | | |

![graph]()
![graph]()
![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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Threading.Tasks.ValueTaskPerfTest*'
```

### System.Threading.Tasks.ValueTaskPerfTest.Copy_PassAsArgumentAndReturn_FromValueTaskSource

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Threading.Tasks.ValueTaskPerfTest.Copy_PassAsArgumentAndReturn_FromTask

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Threading.Tasks.ValueTaskPerfTest.Copy_PassAsArgumentAndReturn_FromResult

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Threading.Tasks.ValueTaskPerfTest.Await_FromResult

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Threading.Tasks.ValueTaskPerfTest.CreateAndAwait_FromResult_ConfigureAwait

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Threading.Tasks.ValueTaskPerfTest.CreateAndAwait_FromResult

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Threading.Tasks.ValueTaskPerfTest.Await_FromCompletedTask

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Threading.Tasks.ValueTaskPerfTest.CreateAndAwait_FromCompletedValueTaskSource_ConfigureAwait

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Threading.Tasks.ValueTaskPerfTest.Await_FromCompletedValueTaskSource

#### 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 | [21d1570e075a895f62c292a5e1854947b97c7dbc](https://github.com/dotnet/runtime/commit/21d1570e075a895f62c292a5e1854947b97c7dbc)
Compare | [a49d0cf4bb262a0bb8a2ece002155cd0a4829dbd](https://github.com/dotnet/runtime/commit/a49d0cf4bb262a0bb8a2ece002155cd0a4829dbd)
Diff | [Diff](https://github.com/dotnet/runtime/compare/21d1570e075a895f62c292a5e1854947b97c7dbc...a49d0cf4bb262a0bb8a2ece002155cd0a4829dbd)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Text.RegularExpressions.Tests.Perf_Regex_Cache

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

  • [IsMatch - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 82.07 ms | 153.62 ms | 1.87 | 0.77 | False | | |
|
  • [IsMatch_Multithreading - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 80.20 ms | 86.94 ms | 1.08 | 0.16 | False | | |

![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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.RegularExpressions.Tests.Perf_Regex_Cache*'
```

### System.Text.RegularExpressions.Tests.Perf_Regex_Cache.IsMatch(total: 400000, unique: 7, cacheSize: 15)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.RegularExpressions.Tests.Perf_Regex_Cache.IsMatch_Multithreading(total: 40000, unique: 1600, cacheSize: 15)

#### 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 | [21d1570e075a895f62c292a5e1854947b97c7dbc](https://github.com/dotnet/runtime/commit/21d1570e075a895f62c292a5e1854947b97c7dbc)
Compare | [a49d0cf4bb262a0bb8a2ece002155cd0a4829dbd](https://github.com/dotnet/runtime/commit/a49d0cf4bb262a0bb8a2ece002155cd0a4829dbd)
Diff | [Diff](https://github.com/dotnet/runtime/compare/21d1570e075a895f62c292a5e1854947b97c7dbc...a49d0cf4bb262a0bb8a2ece002155cd0a4829dbd)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Threading.Channels.Tests.BoundedChannelPerfTests

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

  • [WriteAsyncThenReadAsync - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 42.02 ns | 45.69 ns | 1.09 | 0.08 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Threading.Channels.Tests.BoundedChannelPerfTests*'
```

### System.Threading.Channels.Tests.BoundedChannelPerfTests.WriteAsyncThenReadAsync

#### 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 | [21d1570e075a895f62c292a5e1854947b97c7dbc](https://github.com/dotnet/runtime/commit/21d1570e075a895f62c292a5e1854947b97c7dbc)
Compare | [a49d0cf4bb262a0bb8a2ece002155cd0a4829dbd](https://github.com/dotnet/runtime/commit/a49d0cf4bb262a0bb8a2ece002155cd0a4829dbd)
Diff | [Diff](https://github.com/dotnet/runtime/compare/21d1570e075a895f62c292a5e1854947b97c7dbc...a49d0cf4bb262a0bb8a2ece002155cd0a4829dbd)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Text.Json.Node.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]()
| 2.49 ms | 2.73 ms | 1.09 | 0.02 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Json.Node.Tests.Perf_ParseThenWrite*'
```

### System.Text.Json.Node.Tests.Perf_ParseThenWrite.ParseThenWrite(IsDataIndented: True, 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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