dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x64: 10 Improvements on 2/15/2026 4:44:00 AM +00:00

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arch-x64 branch-refs/heads/main kind-micro os-windows perf-improvement runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [1969a31f6755d0baf5553eca5ec4c2576a539a2a](https://github.com/dotnet/runtime/commit/1969a31f6755d0baf5553eca5ec4c2576a539a2a)
Compare | [253a5c5911d9447ac19864a215408440228da2ed](https://github.com/dotnet/runtime/commit/253a5c5911d9447ac19864a215408440228da2ed)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1969a31f6755d0baf5553eca5ec4c2576a539a2a...253a5c5911d9447ac19864a215408440228da2ed)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.IO.Tests.Perf_FileStream

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

  • [ReadAsync_NoBuffering - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 310.91 μs | 186.14 μs | 0.60 | 0.54 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.19 ms | 703.23 μs | 0.59 | 0.51 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.72 ms | 1.07 ms | 0.62 | 0.61 | False | | |
|
  • [FlushAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.42 ms | 2.75 ms | 0.62 | 0.61 | False | | |
|
  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.01 ms | 583.25 μs | 0.58 | 0.48 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.73 ms | 1.22 ms | 0.70 | 0.63 | False | | |

![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.IO.Tests.Perf_FileStream*'
```

### System.IO.Tests.Perf_FileStream.ReadAsync_NoBuffering(fileSize: 1048576, userBufferSize: 16384, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1048576, userBufferSize: 512, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync(fileSize: 1048576, userBufferSize: 4096, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.FlushAsync(fileSize: 1024, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1048576, userBufferSize: 4096, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_FileStream.WriteAsync(fileSize: 1048576, userBufferSize: 512, options: None)

#### 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 | Windows 10.0.22631
Queue | ViperWindows
Baseline | [1969a31f6755d0baf5553eca5ec4c2576a539a2a](https://github.com/dotnet/runtime/commit/1969a31f6755d0baf5553eca5ec4c2576a539a2a)
Compare | [253a5c5911d9447ac19864a215408440228da2ed](https://github.com/dotnet/runtime/commit/253a5c5911d9447ac19864a215408440228da2ed)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1969a31f6755d0baf5553eca5ec4c2576a539a2a...253a5c5911d9447ac19864a215408440228da2ed)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Buffers.Tests.RentReturnArrayPoolTests<Object>

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

  • [MultipleSerial - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 811.22 ns | 594.53 ns | 0.73 | 0.65 | False | | |
|
  • [SingleSerial - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.98 μs | 2.20 μs | 0.74 | 0.41 | 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.Buffers.Tests.RentReturnArrayPoolTests*'
```

### System.Buffers.Tests.RentReturnArrayPoolTests<Object>.MultipleSerial(RentalSize: 4096, ManipulateArray: False, Async: True, UseSharedPool: False)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Tests.RentReturnArrayPoolTests<Object>.SingleSerial(RentalSize: 4096, ManipulateArray: True, Async: True, UseSharedPool: True)

#### 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 | Windows 10.0.22631
Queue | ViperWindows
Baseline | [1969a31f6755d0baf5553eca5ec4c2576a539a2a](https://github.com/dotnet/runtime/commit/1969a31f6755d0baf5553eca5ec4c2576a539a2a)
Compare | [253a5c5911d9447ac19864a215408440228da2ed](https://github.com/dotnet/runtime/commit/253a5c5911d9447ac19864a215408440228da2ed)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1969a31f6755d0baf5553eca5ec4c2576a539a2a...253a5c5911d9447ac19864a215408440228da2ed)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.IO.Tests.Perf_RandomAccess

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

  • [ReadAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 988.92 μs | 557.92 μs | 0.56 | 0.50 | False | | |
|
  • [WriteAsync - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.47 ms | 1.08 ms | 0.73 | 0.60 | 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.IO.Tests.Perf_RandomAccess*'
```

### System.IO.Tests.Perf_RandomAccess.ReadAsync(fileSize: 1048576, bufferSize: 4096, options: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_RandomAccess.WriteAsync(fileSize: 1048576, bufferSize: 4096, options: None)

#### 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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