[Perf] Linux/arm64: 5 Regressions on 11/10/2025 11:00:37 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [4459d2006773767e7d23f139a20b27ec26f0be59](https://github.com/dotnet/runtime/commit/4459d2006773767e7d23f139a20b27ec26f0be59)
Compare | [118ff8e70941176b2b9b182c57047ca2aec301bd](https://github.com/dotnet/runtime/commit/118ff8e70941176b2b9b182c57047ca2aec301bd)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4459d2006773767e7d23f139a20b27ec26f0be59...118ff8e70941176b2b9b182c57047ca2aec301bd)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in Benchstone.MDBenchI.MDArray2

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Test - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 22.04/Benchstone.MDBenchI.MDArray2.Test.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/runtime/Benchstones/MDBenchI/MDArray2.cs#L64-#L65>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 1.79 secs | 2.03 secs | 1.14 | 0.00 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/11_13_2025/refs/heads/main_arm64_ubuntu%2022.04_Regression/Benchstone.MDBenchI.MDArray2_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/11_13_2025/refs/heads/main_arm64_ubuntu%2022.04_Regression/Benchstone.MDBenchI.MDArray2.html>)

### 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 'Benchstone.MDBenchI.MDArray2*'
```

<details>

### Benchstone.MDBenchI.MDArray2.Test

#### 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)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [4459d2006773767e7d23f139a20b27ec26f0be59](https://github.com/dotnet/runtime/commit/4459d2006773767e7d23f139a20b27ec26f0be59)
Compare | [118ff8e70941176b2b9b182c57047ca2aec301bd](https://github.com/dotnet/runtime/commit/118ff8e70941176b2b9b182c57047ca2aec301bd)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4459d2006773767e7d23f139a20b27ec26f0be59...118ff8e70941176b2b9b182c57047ca2aec301bd)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Tests.Perf_Double

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[ToStringWithFormat - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 22.04/System.Tests.Perf_Double.ToStringWithFormat(value%3a%201.7976931348623157E%2b308%2c%20format%3a%20%22F50%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.Double.cs#L65-#L69>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 32.95 μs | 35.34 μs | 1.07 | 0.00 | False | | |
|<ul><li>[ToStringWithFormat - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 22.04/System.Tests.Perf_Double.ToStringWithFormat(value%3a%20-1.7976931348623157E%2b308%2c%20format%3a%20%22F50%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.Double.cs#L65-#L69>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 32.81 μs | 35.20 μs | 1.07 | 0.00 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/11_13_2025/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Tests.Perf_Double_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/11_13_2025/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Tests.Perf_Double_002.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/11_13_2025/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Tests.Perf_Double.html>)

### 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.Tests.Perf_Double*'
```

<details>

### System.Tests.Perf_Double.ToStringWithFormat(value: 1.7976931348623157E+308, format: "F50")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Double.ToStringWithFormat(value: -1.7976931348623157E+308, format: "F50")

#### 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)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [4459d2006773767e7d23f139a20b27ec26f0be59](https://github.com/dotnet/runtime/commit/4459d2006773767e7d23f139a20b27ec26f0be59)
Compare | [118ff8e70941176b2b9b182c57047ca2aec301bd](https://github.com/dotnet/runtime/commit/118ff8e70941176b2b9b182c57047ca2aec301bd)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4459d2006773767e7d23f139a20b27ec26f0be59...118ff8e70941176b2b9b182c57047ca2aec301bd)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Collections.ContainsKeyFalse&lt;Int32, Int32&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Dictionary - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 22.04/System.Collections.ContainsKeyFalse(Int32%2c%20Int32).Dictionary(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Contains/ContainsKeyFalse.cs#L52-#L61>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 2.63 μs | 3.90 μs | 1.48 | 0.02 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/11_13_2025/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Collections.ContainsKeyFalse%28Int32%2C%20Int32%29_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/11_13_2025/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Collections.ContainsKeyFalse%28Int32%2C%20Int32%29.html>)

### 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.Collections.ContainsKeyFalse<Int32, Int32>*'
```

<details>

### System.Collections.ContainsKeyFalse&lt;Int32, Int32&gt;.Dictionary(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)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [4459d2006773767e7d23f139a20b27ec26f0be59](https://github.com/dotnet/runtime/commit/4459d2006773767e7d23f139a20b27ec26f0be59)
Compare | [118ff8e70941176b2b9b182c57047ca2aec301bd](https://github.com/dotnet/runtime/commit/118ff8e70941176b2b9b182c57047ca2aec301bd)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4459d2006773767e7d23f139a20b27ec26f0be59...118ff8e70941176b2b9b182c57047ca2aec301bd)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Tests.Perf_Single

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[ToStringWithFormat - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 22.04/System.Tests.Perf_Single.ToStringWithFormat(value%3a%20-3.4028235E%2b38%2c%20format%3a%20%22F50%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.Single.cs#L63-#L67>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 1.20 μs | 1.28 μs | 1.06 | 0.00 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/11_13_2025/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Tests.Perf_Single_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/11_13_2025/refs/heads/main_arm64_ubuntu%2022.04_Regression/System.Tests.Perf_Single.html>)

### 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.Tests.Perf_Single*'
```

<details>

### System.Tests.Perf_Single.ToStringWithFormat(value: -3.4028235E+38, format: "F50")

#### 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)

</details>

Name	Value
Architecture	arm64
OS	ubuntu 22.04
Queue	AmpereUbuntu
Baseline	4459d2006773767e7d23f139a20b27ec26f0be59
Compare	118ff8e70941176b2b9b182c57047ca2aec301bd
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
ToStringWithFormat - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	32.95 μs	35.34 μs	1.07	0.00	False
ToStringWithFormat - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	32.81 μs	35.20 μs	1.07	0.00	False

[Perf] Linux/arm64: 5 Regressions on 11/10/2025 11:00:37 PM +00:00 #121585

Description

Run Information

Regressions in Benchstone.MDBenchI.MDArray2

Repro

Benchstone.MDBenchI.MDArray2.Test

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.Tests.Perf_Double

Repro

System.Tests.Perf_Double.ToStringWithFormat(value: 1.7976931348623157E+308, format: "F50")

ETL Files

Histogram

JIT Disasms

System.Tests.Perf_Double.ToStringWithFormat(value: -1.7976931348623157E+308, format: "F50")

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.Collections.ContainsKeyFalse<Int32, Int32>

Repro

System.Collections.ContainsKeyFalse<Int32, Int32>.Dictionary(Size: 512)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.Tests.Perf_Single

Repro

System.Tests.Perf_Single.ToStringWithFormat(value: -3.4028235E+38, format: "F50")

ETL Files

Histogram

JIT Disasms

Docs

Metadata

Metadata

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