[Perf] Linux/x64: 14 Regressions on 10/15/2025 10:47:28 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [caeb3b42e227a69114b39a6ba8d059f5ae9bb662](https://github.com/dotnet/runtime/commit/caeb3b42e227a69114b39a6ba8d059f5ae9bb662)
Compare | [878667df31aa5f8fe365d8a8bb4bc655049bcbca](https://github.com/dotnet/runtime/commit/878667df31aa5f8fe365d8a8bb4bc655049bcbca)
Diff | [Diff](https://github.com/dotnet/runtime/compare/caeb3b42e227a69114b39a6ba8d059f5ae9bb662...878667df31aa5f8fe365d8a8bb4bc655049bcbca)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Collections.Tests.Perf_BitArray

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[BitArrayCopyToBoolArray - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.Collections.Tests.Perf_BitArray.BitArrayCopyToBoolArray(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Perf.BitArray.cs#L167-#L168>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 72.35 ns | 87.08 ns | 1.20 | 0.03 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Collections.Tests.Perf_BitArray_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Collections.Tests.Perf_BitArray.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.Tests.Perf_BitArray*'
```

<details>

### System.Collections.Tests.Perf_BitArray.BitArrayCopyToBoolArray(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 | ViperUbuntu
Baseline | [caeb3b42e227a69114b39a6ba8d059f5ae9bb662](https://github.com/dotnet/runtime/commit/caeb3b42e227a69114b39a6ba8d059f5ae9bb662)
Compare | [878667df31aa5f8fe365d8a8bb4bc655049bcbca](https://github.com/dotnet/runtime/commit/878667df31aa5f8fe365d8a8bb4bc655049bcbca)
Diff | [Diff](https://github.com/dotnet/runtime/compare/caeb3b42e227a69114b39a6ba8d059f5ae9bb662...878667df31aa5f8fe365d8a8bb4bc655049bcbca)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.IO.Compression.Brotli

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Decompress_WithState - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.IO.Compression.Brotli.Decompress_WithState(level%3a%20Fastest%2c%20file%3a%20%22sum%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.Compression/Brotli.cs#L37-#L53>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=H4sIAAAAAAAACl1RXY/TMBB8r9T/sOTFrcgloadCL8gS3AdwQiekawWPyCSbxsixK3tz14rjv7NO0hdebHm9Mzsza5CAMBBI+CC2p0DYZfffshvXHTyGoJ3Nrr0jo7NbrKbizx+a2i0pwoXBJzQlfFIMDJRCow2WkIS+S5bi/XxmmF41hJ75awaQ7nCxKlbri2JzsXqzKzZlsS4vr7L1202xeXf1uijKolhOSI8Hx0BRO7JIue9txJ95f3llqzb+e2xC3qKqQ94pbc8NlbON3sfJJ6s6XS3+iOhLG0Xs68HVKEoQpNFjLVIQj739qm0di9ztnfgbhXxG+qIDOa8rZW4Vqeg+8iivg7NhEZ3L0f5gVQ5nOqiX8UgnqXK80kmYHK/lfPYCB+9+Y0WwRa8xpHDda1Pv2CzH3B1S+K5Mj3LHQ24cp4D+EUNv6OMTerXH+SzPX+C5ZSMTA7xicuIsAiQJubtjZfoakwTyHO6OTGkQXBPXxVza7sH1vCgIAzgK8mhr3lrMu2qVJ3hm17AYG+RZ5rFypu+s/F/uaawHOejmPtJkUAqODznp0/R8QBV6jx1aEst/mxeTUooCAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=>)</li></ul> | 55.92 μs | 68.26 μs | 1.22 | 0.10 | False | | |
|<ul><li>[Decompress_WithoutState - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.IO.Compression.Brotli.Decompress_WithoutState(level%3a%20Fastest%2c%20file%3a%20%22alice29.txt%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.Compression/Brotli.cs#L64-#L66>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 329.33 μs | 369.75 μs | 1.12 | 0.04 | False | | |
|<ul><li>[Decompress_WithState - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.IO.Compression.Brotli.Decompress_WithState(level%3a%20Fastest%2c%20file%3a%20%22alice29.txt%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.Compression/Brotli.cs#L37-#L53>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 330.31 μs | 370.06 μs | 1.12 | 0.02 | False | | |
|<ul><li>[Decompress_WithoutState - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.IO.Compression.Brotli.Decompress_WithoutState(level%3a%20Fastest%2c%20file%3a%20%22sum%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.IO.Compression/Brotli.cs#L64-#L66>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 55.72 μs | 67.90 μs | 1.22 | 0.12 | False | | |
|<ul><li>[Decompress - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.IO.Compression.Brotli.Decompress(level%3a%20Fastest%2c%20file%3a%20%22alice29.txt%22).html>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 343.97 μs | 372.93 μs | 1.08 | 0.01 | False | | |
|<ul><li>[Decompress - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.IO.Compression.Brotli.Decompress(level%3a%20Fastest%2c%20file%3a%20%22sum%22).html>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 59.63 μs | 68.83 μs | 1.15 | 0.15 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.IO.Compression.Brotli_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.IO.Compression.Brotli_002.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.IO.Compression.Brotli_003.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.IO.Compression.Brotli_004.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.IO.Compression.Brotli_005.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.IO.Compression.Brotli_006.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.IO.Compression.Brotli.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.IO.Compression.Brotli*'
```

<details>

### System.IO.Compression.Brotli.Decompress_WithState(level: Fastest, file: "sum")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Compression.Brotli.Decompress_WithoutState(level: Fastest, file: "alice29.txt")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Compression.Brotli.Decompress_WithState(level: Fastest, file: "alice29.txt")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Compression.Brotli.Decompress_WithoutState(level: Fastest, file: "sum")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Compression.Brotli.Decompress(level: Fastest, file: "alice29.txt")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Compression.Brotli.Decompress(level: Fastest, file: "sum")

#### 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 | ViperUbuntu
Baseline | [caeb3b42e227a69114b39a6ba8d059f5ae9bb662](https://github.com/dotnet/runtime/commit/caeb3b42e227a69114b39a6ba8d059f5ae9bb662)
Compare | [878667df31aa5f8fe365d8a8bb4bc655049bcbca](https://github.com/dotnet/runtime/commit/878667df31aa5f8fe365d8a8bb4bc655049bcbca)
Diff | [Diff](https://github.com/dotnet/runtime/compare/caeb3b42e227a69114b39a6ba8d059f5ae9bb662...878667df31aa5f8fe365d8a8bb4bc655049bcbca)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Tests.Perf_Char

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Char_ToLowerInvariant - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.Tests.Perf_Char.Char_ToLowerInvariant(input%3a%20%22Hello%20World!%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.Char.cs#L75-#L85>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 5.27 ns | 7.25 ns | 1.37 | 0.04 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Tests.Perf_Char_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Tests.Perf_Char.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_Char*'
```

<details>

### System.Tests.Perf_Char.Char_ToLowerInvariant(input: "Hello World!")

#### 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 | ViperUbuntu
Baseline | [caeb3b42e227a69114b39a6ba8d059f5ae9bb662](https://github.com/dotnet/runtime/commit/caeb3b42e227a69114b39a6ba8d059f5ae9bb662)
Compare | [878667df31aa5f8fe365d8a8bb4bc655049bcbca](https://github.com/dotnet/runtime/commit/878667df31aa5f8fe365d8a8bb4bc655049bcbca)
Diff | [Diff](https://github.com/dotnet/runtime/compare/caeb3b42e227a69114b39a6ba8d059f5ae9bb662...878667df31aa5f8fe365d8a8bb4bc655049bcbca)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Tests.Perf_String

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[ToLowerInvariant - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.Tests.Perf_String.ToLowerInvariant(s%3a%20%22This%20is%20a%20much%20longer%20piece%20of%20text%20that%20might%20benefit%20more%20from%20vectorization.%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.String.cs#L239-#L246>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 21.65 ns | 22.88 ns | 1.06 | 0.06 | False | | |
|<ul><li>[ToUpperInvariant - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.Tests.Perf_String.ToUpperInvariant(s%3a%20%22TeSt%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.String.cs#L223-#L229>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 12.42 ns | 13.49 ns | 1.09 | 0.10 | False | | |
|<ul><li>[ToUpperInvariant - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.Tests.Perf_String.ToUpperInvariant(s%3a%20%22test%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.String.cs#L223-#L229>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 12.15 ns | 13.49 ns | 1.11 | 0.07 | False | | |
|<ul><li>[ToLowerInvariant - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.Tests.Perf_String.ToLowerInvariant(s%3a%20%22TEST%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.String.cs#L239-#L246>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 12.19 ns | 13.52 ns | 1.11 | 0.10 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Tests.Perf_String_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Tests.Perf_String_002.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Tests.Perf_String_003.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Tests.Perf_String_004.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Tests.Perf_String.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_String*'
```

<details>

### System.Tests.Perf_String.ToLowerInvariant(s: "This is a much longer piece of text that might benefit more from vectorization.")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.ToUpperInvariant(s: "TeSt")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.ToUpperInvariant(s: "test")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.ToLowerInvariant(s: "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 | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [caeb3b42e227a69114b39a6ba8d059f5ae9bb662](https://github.com/dotnet/runtime/commit/caeb3b42e227a69114b39a6ba8d059f5ae9bb662)
Compare | [878667df31aa5f8fe365d8a8bb4bc655049bcbca](https://github.com/dotnet/runtime/commit/878667df31aa5f8fe365d8a8bb4bc655049bcbca)
Diff | [Diff](https://github.com/dotnet/runtime/compare/caeb3b42e227a69114b39a6ba8d059f5ae9bb662...878667df31aa5f8fe365d8a8bb4bc655049bcbca)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Count - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.Count(Pattern%3a%20%22%5c%5cp%7bL%7d%22%2c%20Options%3a%20NonBacktracking).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Text.RegularExpressions/Perf.Regex.Industry.cs#L193-#L195>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 16.55 ms | 18.19 ms | 1.10 | 0.10 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.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.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock*'
```

<details>

### System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.Count(Pattern: "\\p{L}", Options: NonBacktracking)

#### 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 | ViperUbuntu
Baseline | [caeb3b42e227a69114b39a6ba8d059f5ae9bb662](https://github.com/dotnet/runtime/commit/caeb3b42e227a69114b39a6ba8d059f5ae9bb662)
Compare | [878667df31aa5f8fe365d8a8bb4bc655049bcbca](https://github.com/dotnet/runtime/commit/878667df31aa5f8fe365d8a8bb4bc655049bcbca)
Diff | [Diff](https://github.com/dotnet/runtime/compare/caeb3b42e227a69114b39a6ba8d059f5ae9bb662...878667df31aa5f8fe365d8a8bb4bc655049bcbca)
Configs | CompilationMode:tiered, RunKind:micro


### Regressions in System.Tests.Perf_Environment

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[SetEnvironmentVariable - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.Tests.Perf_Environment.SetEnvironmentVariable.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime.Extensions/Perf.Environment.cs#L42-#L47>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 358.90 ns | 426.70 ns | 1.19 | 0.19 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Tests.Perf_Environment_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_21_2025/refs/heads/main_x64_ubuntu%2022.04/ViperUbuntu_Regression/System.Tests.Perf_Environment.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_Environment*'
```

<details>

### System.Tests.Perf_Environment.SetEnvironmentVariable

#### 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	x64
OS	ubuntu 22.04
Queue	ViperUbuntu
Baseline	caeb3b42e227a69114b39a6ba8d059f5ae9bb662
Compare	878667df31aa5f8fe365d8a8bb4bc655049bcbca
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
Decompress_WithState - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	55.92 μs	68.26 μs	1.22	0.10	False
Decompress_WithoutState - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	329.33 μs	369.75 μs	1.12	0.04	False
Decompress_WithState - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	330.31 μs	370.06 μs	1.12	0.02	False
Decompress_WithoutState - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	55.72 μs	67.90 μs	1.22	0.12	False
Decompress - Duration of single invocation ADX - Test Multi Config Graph	343.97 μs	372.93 μs	1.08	0.01	False
Decompress - Duration of single invocation ADX - Test Multi Config Graph	59.63 μs	68.83 μs	1.15	0.15	False

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
ToLowerInvariant - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	21.65 ns	22.88 ns	1.06	0.06	False
ToUpperInvariant - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	12.42 ns	13.49 ns	1.09	0.10	False
ToUpperInvariant - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	12.15 ns	13.49 ns	1.11	0.07	False
ToLowerInvariant - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	12.19 ns	13.52 ns	1.11	0.10	False

[Perf] Linux/x64: 14 Regressions on 10/15/2025 10:47:28 PM +00:00 #120945

Description

Run Information

Regressions in System.Collections.Tests.Perf_BitArray

Repro

System.Collections.Tests.Perf_BitArray.BitArrayCopyToBoolArray(Size: 512)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.IO.Compression.Brotli

Repro

System.IO.Compression.Brotli.Decompress_WithState(level: Fastest, file: "sum")

ETL Files

Histogram

JIT Disasms

System.IO.Compression.Brotli.Decompress_WithoutState(level: Fastest, file: "alice29.txt")

ETL Files

Histogram

JIT Disasms

System.IO.Compression.Brotli.Decompress_WithState(level: Fastest, file: "alice29.txt")

ETL Files

Histogram

JIT Disasms

System.IO.Compression.Brotli.Decompress_WithoutState(level: Fastest, file: "sum")

ETL Files

Histogram

JIT Disasms

System.IO.Compression.Brotli.Decompress(level: Fastest, file: "alice29.txt")

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System.IO.Compression.Brotli.Decompress(level: Fastest, file: "sum")

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Regressions in System.Tests.Perf_Char

Repro

System.Tests.Perf_Char.Char_ToLowerInvariant(input: "Hello World!")

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Regressions in System.Tests.Perf_String

Repro

System.Tests.Perf_String.ToLowerInvariant(s: "This is a much longer piece of text that might benefit more from vectorization.")

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System.Tests.Perf_String.ToUpperInvariant(s: "TeSt")

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System.Tests.Perf_String.ToUpperInvariant(s: "test")

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System.Tests.Perf_String.ToLowerInvariant(s: "TEST")

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Regressions in System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock

Repro

System.Text.RegularExpressions.Tests.Perf_Regex_Industry_RustLang_Sherlock.Count(Pattern: "\p{L}", Options: NonBacktracking)

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Regressions in System.Tests.Perf_Environment

Repro

System.Tests.Perf_Environment.SetEnvironmentVariable

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