dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/arm64: 11 Improvements on 3/5/2026 10:46:25 PM +00:00

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ampere arch-arm64 branch-refs/heads/main kind-micro os-linux perf-improvement runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [ef560fa423d0e4164056496f71f97ab97dba7799](https://github.com/dotnet/runtime/commit/ef560fa423d0e4164056496f71f97ab97dba7799)
Compare | [b85f10962df5d097ca466ec0ed83664835671e42](https://github.com/dotnet/runtime/commit/b85f10962df5d097ca466ec0ed83664835671e42)
Diff | [Diff](https://github.com/dotnet/runtime/compare/ef560fa423d0e4164056496f71f97ab97dba7799...b85f10962df5d097ca466ec0ed83664835671e42)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Text.Json.Tests.Perf_Get

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

  • [GetUInt16 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 574.60 ns | 508.25 ns | 0.88 | 0.02 | False | | |
|
  • [GetUInt64 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 581.46 ns | 516.78 ns | 0.89 | 0.36 | False | | |
|
  • [GetByte - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 608.44 ns | 523.26 ns | 0.86 | 0.02 | False | | |
|
  • [GetSByte - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 742.97 ns | 610.53 ns | 0.82 | 0.02 | 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.Text.Json.Tests.Perf_Get*'
```

### System.Text.Json.Tests.Perf_Get.GetUInt16

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Tests.Perf_Get.GetUInt64

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Tests.Perf_Get.GetByte

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Tests.Perf_Get.GetSByte

#### 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 | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [ef560fa423d0e4164056496f71f97ab97dba7799](https://github.com/dotnet/runtime/commit/ef560fa423d0e4164056496f71f97ab97dba7799)
Compare | [b85f10962df5d097ca466ec0ed83664835671e42](https://github.com/dotnet/runtime/commit/b85f10962df5d097ca466ec0ed83664835671e42)
Diff | [Diff](https://github.com/dotnet/runtime/compare/ef560fa423d0e4164056496f71f97ab97dba7799...b85f10962df5d097ca466ec0ed83664835671e42)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Text.Json.Tests.Perf_Doubles

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

  • [WriteDoubles - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 20.62 ms | 18.98 ms | 0.92 | 0.01 | False | | |
|
  • [WriteDoubles - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 19.85 ms | 18.56 ms | 0.94 | 0.01 | False | | |
|
  • [WriteDoubles - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 20.57 ms | 18.93 ms | 0.92 | 0.01 | False | | |
|
  • [WriteDoubles - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 19.84 ms | 18.58 ms | 0.94 | 0.01 | 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.Text.Json.Tests.Perf_Doubles*'
```

### System.Text.Json.Tests.Perf_Doubles.WriteDoubles(Formatted: True, SkipValidation: False)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Tests.Perf_Doubles.WriteDoubles(Formatted: False, SkipValidation: False)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Tests.Perf_Doubles.WriteDoubles(Formatted: True, SkipValidation: True)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Json.Tests.Perf_Doubles.WriteDoubles(Formatted: False, SkipValidation: 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 | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [ef560fa423d0e4164056496f71f97ab97dba7799](https://github.com/dotnet/runtime/commit/ef560fa423d0e4164056496f71f97ab97dba7799)
Compare | [b85f10962df5d097ca466ec0ed83664835671e42](https://github.com/dotnet/runtime/commit/b85f10962df5d097ca466ec0ed83664835671e42)
Diff | [Diff](https://github.com/dotnet/runtime/compare/ef560fa423d0e4164056496f71f97ab97dba7799...b85f10962df5d097ca466ec0ed83664835671e42)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Buffers.Text.Tests.Utf8FormatterTests

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

  • [FormatterDouble - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 182.74 ns | 164.25 ns | 0.90 | 0.01 | False | | |
|
  • [FormatterDouble - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 186.08 ns | 164.40 ns | 0.88 | 0.01 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Text.Tests.Utf8FormatterTests*'
```

### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterDouble(value: 1.7976931348623157E+308)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterDouble(value: -1.7976931348623157E+308)

#### 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 | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [ef560fa423d0e4164056496f71f97ab97dba7799](https://github.com/dotnet/runtime/commit/ef560fa423d0e4164056496f71f97ab97dba7799)
Compare | [b85f10962df5d097ca466ec0ed83664835671e42](https://github.com/dotnet/runtime/commit/b85f10962df5d097ca466ec0ed83664835671e42)
Diff | [Diff](https://github.com/dotnet/runtime/compare/ef560fa423d0e4164056496f71f97ab97dba7799...b85f10962df5d097ca466ec0ed83664835671e42)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Memory.Span<Int32>

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

  • [Reverse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 152.40 ns | 66.74 ns | 0.44 | 0.09 | 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.Memory.Span*'
```

### System.Memory.Span<Int32>.Reverse(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)

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