[Perf] Linux/arm64: 4 Improvements on 6/26/2026 6:28:17 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [99eb16b5420fe88e333e2d95600b8617a86d54ff](https://github.com/dotnet/runtime/commit/99eb16b5420fe88e333e2d95600b8617a86d54ff)
Compare | [62404420e54ff7257b87ca8cebb97673d4c42b84](https://github.com/dotnet/runtime/commit/62404420e54ff7257b87ca8cebb97673d4c42b84)
Diff | [Diff](https://github.com/dotnet/runtime/compare/99eb16b5420fe88e333e2d95600b8617a86d54ff...62404420e54ff7257b87ca8cebb97673d4c42b84)
Configs | CompilationMode:tiered, RunKind:micro


### Improvements 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%2022.04/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#L58-#L67>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 5.55 μs | 2.66 μs | 0.48 | 0.25 | False | | |
|<ul><li>[IDictionary - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu%2022.04/System.Collections.ContainsKeyFalse(Int32%2c%20Int32).IDictionary(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Contains/ContainsKeyFalse.cs#L69-#L71>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 5.49 μs | 2.65 μs | 0.48 | 0.05 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_02_2026/refs/heads/main_arm64_ubuntu%2022.04_Improvement/System.Collections.ContainsKeyFalse%28Int32%2C%20Int32%29_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_02_2026/refs/heads/main_arm64_ubuntu%2022.04_Improvement/System.Collections.ContainsKeyFalse%28Int32%2C%20Int32%29_002.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_02_2026/refs/heads/main_arm64_ubuntu%2022.04_Improvement/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

### System.Collections.ContainsKeyFalse&lt;Int32, Int32&gt;.IDictionary(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 | [99eb16b5420fe88e333e2d95600b8617a86d54ff](https://github.com/dotnet/runtime/commit/99eb16b5420fe88e333e2d95600b8617a86d54ff)
Compare | [62404420e54ff7257b87ca8cebb97673d4c42b84](https://github.com/dotnet/runtime/commit/62404420e54ff7257b87ca8cebb97673d4c42b84)
Diff | [Diff](https://github.com/dotnet/runtime/compare/99eb16b5420fe88e333e2d95600b8617a86d54ff...62404420e54ff7257b87ca8cebb97673d4c42b84)
Configs | CompilationMode:tiered, RunKind:micro


### Improvements in System.Collections.IterateForEach&lt;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%2022.04/System.Collections.IterateForEach(Int32).Dictionary(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Iterate/IterateForEach.cs#L146-#L154>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 797.57 ns | 648.47 ns | 0.81 | 0.01 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_02_2026/refs/heads/main_arm64_ubuntu%2022.04_Improvement/System.Collections.IterateForEach%28Int32%29_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_02_2026/refs/heads/main_arm64_ubuntu%2022.04_Improvement/System.Collections.IterateForEach%28Int32%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.IterateForEach<Int32>*'
```

<details>

### System.Collections.IterateForEach&lt;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 | [99eb16b5420fe88e333e2d95600b8617a86d54ff](https://github.com/dotnet/runtime/commit/99eb16b5420fe88e333e2d95600b8617a86d54ff)
Compare | [62404420e54ff7257b87ca8cebb97673d4c42b84](https://github.com/dotnet/runtime/commit/62404420e54ff7257b87ca8cebb97673d4c42b84)
Diff | [Diff](https://github.com/dotnet/runtime/compare/99eb16b5420fe88e333e2d95600b8617a86d54ff...62404420e54ff7257b87ca8cebb97673d4c42b84)
Configs | CompilationMode:tiered, RunKind:micro


### Improvements in System.Collections.DictionaryContainsKey&lt;Int32&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[ContainsKeyFalse - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu%2022.04/System.Collections.DictionaryContainsKey(Int32).ContainsKeyFalse(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Contains/DictionaryContainsKey.cs#L46-#L55>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 6.04 μs | 2.64 μs | 0.44 | 0.08 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_02_2026/refs/heads/main_arm64_ubuntu%2022.04_Improvement/System.Collections.DictionaryContainsKey%28Int32%29_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/07_02_2026/refs/heads/main_arm64_ubuntu%2022.04_Improvement/System.Collections.DictionaryContainsKey%28Int32%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.DictionaryContainsKey<Int32>*'
```

<details>

### System.Collections.DictionaryContainsKey&lt;Int32&gt;.ContainsKeyFalse(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>

Name	Value
Architecture	arm64
OS	ubuntu 22.04
Queue	AmpereUbuntu
Baseline	99eb16b5420fe88e333e2d95600b8617a86d54ff
Compare	62404420e54ff7257b87ca8cebb97673d4c42b84
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
Dictionary - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	5.55 μs	2.66 μs	0.48	0.25	False
IDictionary - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	5.49 μs	2.65 μs	0.48	0.05	False

Uh oh!

[Perf] Linux/arm64: 4 Improvements on 6/26/2026 6:28:17 PM +00:00 #75534

Description

Run Information

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

Repro

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

ETL Files

Histogram

JIT Disasms

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

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Improvements in System.Collections.IterateForEach<Int32>

Repro

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

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Improvements in System.Collections.DictionaryContainsKey<Int32>

Repro

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

ETL Files

Histogram

JIT Disasms

Docs

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