[Perf] #120313 Regressions on 10/3/2025 7:37:23 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | TigerUbuntu
Baseline | [1e1451e4ebe4808ee2e806a20f6eaf49d19d1ffe](https://github.com/dotnet/runtime/commit/1e1451e4ebe4808ee2e806a20f6eaf49d19d1ffe)
Compare | [d6adddf448ecbf3128eb762a5ea480a676624775](https://github.com/dotnet/runtime/commit/d6adddf448ecbf3128eb762a5ea480a676624775)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1e1451e4ebe4808ee2e806a20f6eaf49d19d1ffe...d6adddf448ecbf3128eb762a5ea480a676624775)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Collections.CtorFromCollection&lt;String&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[ImmutableList - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/System.Collections.CtorFromCollection(String).ImmutableList(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Create/CtorFromCollection.cs#L89-#L90>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 7.89 μs | 8.68 μs | 1.10 | 0.12 | False | | |
|<ul><li>[LinkedList - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/System.Collections.CtorFromCollection(String).LinkedList(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Create/CtorFromCollection.cs#L41-#L42>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 5.77 μs | 6.34 μs | 1.10 | 0.12 | False | | |
|<ul><li>[ImmutableStack - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/System.Collections.CtorFromCollection(String).ImmutableStack(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Create/CtorFromCollection.cs#L95-#L96>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 3.06 μs | 3.39 μs | 1.11 | 0.09 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_Regression/System.Collections.CtorFromCollection%28String%29_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_Regression/System.Collections.CtorFromCollection%28String%29_002.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_Regression/System.Collections.CtorFromCollection%28String%29_003.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_Regression/System.Collections.CtorFromCollection%28String%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.CtorFromCollection<String>*'
```

<details>

### System.Collections.CtorFromCollection&lt;String&gt;.ImmutableList(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorFromCollection&lt;String&gt;.LinkedList(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.CtorFromCollection&lt;String&gt;.ImmutableStack(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 | x64
OS | ubuntu 22.04
Queue | TigerUbuntu
Baseline | [1e1451e4ebe4808ee2e806a20f6eaf49d19d1ffe](https://github.com/dotnet/runtime/commit/1e1451e4ebe4808ee2e806a20f6eaf49d19d1ffe)
Compare | [d6adddf448ecbf3128eb762a5ea480a676624775](https://github.com/dotnet/runtime/commit/d6adddf448ecbf3128eb762a5ea480a676624775)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1e1451e4ebe4808ee2e806a20f6eaf49d19d1ffe...d6adddf448ecbf3128eb762a5ea480a676624775)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Collections.IterateForEach&lt;String&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[IEnumerable - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/System.Collections.IterateForEach(String).IEnumerable(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Iterate/IterateForEach.cs#L88-#L90>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 148.76 ns | 628.31 ns | 4.22 | 0.03 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_Regression/System.Collections.IterateForEach%28String%29_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_Regression/System.Collections.IterateForEach%28String%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<String>*'
```

<details>

### System.Collections.IterateForEach&lt;String&gt;.IEnumerable(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>

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Uh oh!

[Perf] #120313 Regressions on 10/3/2025 7:37:23 PM +00:00 #120469

Run Information

Regressions in System.Collections.CtorFromCollection<String>

Repro

System.Collections.CtorFromCollection<String>.ImmutableList(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Collections.CtorFromCollection<String>.LinkedList(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Collections.CtorFromCollection<String>.ImmutableStack(Size: 512)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.Collections.IterateForEach<String>

Repro

System.Collections.IterateForEach<String>.IEnumerable(Size: 512)

ETL Files

Histogram

JIT Disasms

Docs

Metadata

Assignees

Labels

Type

Projects

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Development

Name	Value
Architecture	x64
OS	ubuntu 22.04
Queue	TigerUbuntu
Baseline	1e1451e4ebe4808ee2e806a20f6eaf49d19d1ffe
Compare	d6adddf448ecbf3128eb762a5ea480a676624775
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
ImmutableList - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	7.89 μs	8.68 μs	1.10	0.12	False
LinkedList - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	5.77 μs	6.34 μs	1.10	0.12	False
ImmutableStack - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	3.06 μs	3.39 μs	1.11	0.09	False

Uh oh!

[Perf] #120313 Regressions on 10/3/2025 7:37:23 PM +00:00 #120469

Description

Run Information

Regressions in System.Collections.CtorFromCollection<String>

Repro

System.Collections.CtorFromCollection<String>.ImmutableList(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Collections.CtorFromCollection<String>.LinkedList(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Collections.CtorFromCollection<String>.ImmutableStack(Size: 512)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.Collections.IterateForEach<String>

Repro

System.Collections.IterateForEach<String>.IEnumerable(Size: 512)

ETL Files

Histogram

JIT Disasms

Docs

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions