[Perf] Linux/x64: 16 Regressions on 10/1/2025 10:50:57 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [a7d6c954808c572be4ac571b779b0ed6897ae24d](https://github.com/dotnet/runtime/commit/a7d6c954808c572be4ac571b779b0ed6897ae24d)
Compare | [ca29ebb973cd64c5c6d510828affe9632584b536](https://github.com/dotnet/runtime/commit/ca29ebb973cd64c5c6d510828affe9632584b536)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a7d6c954808c572be4ac571b779b0ed6897ae24d...ca29ebb973cd64c5c6d510828affe9632584b536)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in System.Memory.Span&lt;Byte&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[EndsWith - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Memory.Span(Byte).EndsWith(Size%3a%2033).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.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> | 86.18 ns | 98.44 ns | 1.14 | 0.16 | False | | |
|<ul><li>[SequenceEqual - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Memory.Span(Byte).SequenceEqual(Size%3a%2033).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L52-#L53>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 74.00 ns | 80.77 ns | 1.09 | 0.24 | False | | |
|<ul><li>[SequenceCompareTo - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Memory.Span(Byte).SequenceCompareTo(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L55-#L56>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 419.19 ns | 491.68 ns | 1.17 | 0.33 | False | | |
|<ul><li>[LastIndexOfAnyValues - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Memory.Span(Byte).LastIndexOfAnyValues(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L96-#L97>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 340.64 ns | 382.46 ns | 1.12 | 0.21 | False | | |
|<ul><li>[StartsWith - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Memory.Span(Byte).StartsWith(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L61-#L62>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 238.11 ns | 284.06 ns | 1.19 | 0.42 | False | | |
|<ul><li>[EndsWith - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Memory.Span(Byte).EndsWith(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.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> | 245.27 ns | 317.02 ns | 1.29 | 0.26 | False | | |
|<ul><li>[SequenceEqual - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Memory.Span(Byte).SequenceEqual(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L52-#L53>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 391.93 ns | 521.30 ns | 1.33 | 0.34 | False | | |
|<ul><li>[SequenceCompareTo - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Memory.Span(Byte).SequenceCompareTo(Size%3a%2033).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L55-#L56>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 82.12 ns | 89.81 ns | 1.09 | 0.20 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Memory.Span%28Byte%29_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Memory.Span%28Byte%29_002.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Memory.Span%28Byte%29_003.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Memory.Span%28Byte%29_004.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Memory.Span%28Byte%29_005.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Memory.Span%28Byte%29_006.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Memory.Span%28Byte%29_007.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Memory.Span%28Byte%29_008.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Memory.Span%28Byte%29.html>)

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

<details>
<summary>Repro Steps</summary>


#### Prerequisites (Build files either built locally or downloaded from payload above)
- Libraries build extracted to `runtime/artifacts` or build instructions: [Libraries README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/libraries/README.md) args: `-subset libs+libs.tests -rc release -configuration Release -arch $RunArch -framework net8.0`
- CoreCLR product build extracted to `runtime/artifacts/bin/coreclr/$RunOS.$RunArch.Release`, build instructions: [CoreCLR README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/coreclr/README.md) args: `-subset clr+libs -rc release -configuration Release -arch $RunArch -framework net8.0`
- Mono Runtime build extracted to `runtime/artifacts/bin/mono/$RunOS.$RunArch.Release`, build instructions: [MONO README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/mono/README.md) args: `-arch $RunArch -os $RunOS -s mono+libs+host+packs -c Release`
- Dotnet SDK installed for dotnet commands
- Running commands from the runtime folder

Linux
```cmd
# Set $RunDir to the runtime directory
RunDir=`pwd`

# Set the OS, arch, and OSId
RunOS='linux'
RunOSId='linux'
RunArch='x64'

# Create mono dotnet
mkdir -p $RunDir/artifacts/dotnet-mono
$RunDir/build.sh -subset libs.pretest -configuration release -ci -arch $RunArch -testscope innerloop /p:RuntimeArtifactsPath=$RunDir/artifacts/bin/mono/$RunOS.$RunArch.Release /p:RuntimeFlavor=mono
cp $RunDir/artifacts/bin/runtime/net8.0-$RunOS-Release-$RunArch/* $RunDir/artifacts/bin/testhost/net8.0-$RunOS-Release-$RunArch/shared/Microsoft.NETCore.App/8.0.0 -rf
cp $RunDir/artifacts/bin/testhost/net8.0-$RunOS-Release-$RunArch/* $RunDir/artifacts/dotnet-mono -r
cp $RunDir/artifacts/bin/coreclr/$RunOS.$RunArch.Release/corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun

# Create Core Root
$RunDir/src/tests/build.sh release $RunArch generatelayoutonly /p:LibrariesConfiguration=Release

# Clone performance
git clone --branch main --depth 1 --quiet https://github.com/dotnet/performance.git $RunDir/performance

# Use Interpreter
export MONO_ENV_OPTIONS="--interpreter"

# One line run:
python3 $RunDir/performance/scripts/benchmarks_ci.py --csproj $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --incremental no --architecture $RunArch -f net8.0 --filter 'System.Memory.Span&lt;Byte&gt;*' --bdn-artifacts $RunDir/artifacts/BenchmarkDotNet.Artifacts --bdn-arguments="--anyCategories Libraries Runtime  --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun"

# Individual Commands:
# Restore
dotnet restore $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --packages $RunDir/performance/artifacts/packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Build
dotnet build $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore /p:NuGetPackageRoot=$RunDir/performance/artifacts/packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Run
dotnet run --project $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore --no-build -- --filter 'System.Memory.Span&lt;Byte&gt;*' --anyCategories Libraries Runtime " --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun --artifacts $RunDir/artifacts/BenchmarkDotNet.Artifacts --packages $RunDir/performance/artifacts/packages
```

Windows
```cmd
# Set $RunDir to the runtime directory
$RunDir="FullPathHere"

# Set the OS, arch, and OSId
RunOS='windows'
RunOSId='win'
RunArch='x64'

# Create mono dotnet
mkdir -p $RunDir/artifacts/dotnet-mono
$RunDir/build.sh -subset libs.pretest -configuration release -ci -arch $RunArch -testscope innerloop /p:RuntimeArtifactsPath=$RunDir\artifacts\bin\mono\$RunOS.$RunArch.Release /p:RuntimeFlavor=mono
xcopy $RunDir\artifacts\bin\runtime\net8.0-$RunOS-Release-$RunArch\ $RunDir\artifacts\bin\testhost\net8.0-$RunOS-Release-$RunArch\shared\Microsoft.NETCore.App\8.0.0\ /e /y
xcopy $RunDir\artifacts\bin\testhost\net8.0-$RunOS-Release-$RunArch\ $RunDir\artifacts\dotnet-mono\ /e /y
xcopy $RunDir\artifacts\bin\coreclr\$RunOS.$RunArch.Release\corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun /y

# Create Core Root
$RunDir\src\tests\build.cmd release $RunArch generatelayoutonly /p:LibrariesConfiguration=Release

# Clone performance
git clone --branch main --depth 1 --quiet https://github.com/dotnet/performance.git $RunDir\performance

# Use Interpreter
export MONO_ENV_OPTIONS="--interpreter"

# One line run:
python3 $RunDir\performance\scripts\benchmarks_ci.py --csproj $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --incremental no --architecture $RunArch -f net8.0 --filter 'System.Memory.Span&lt;Byte&gt;*' --bdn-artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --bdn-arguments="--anyCategories Libraries Runtime  --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun.exe"

# Individual Commands:
# Restore
dotnet restore $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --packages $RunDir\performance\artifacts\packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Build
dotnet build $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore /p:NuGetPackageRoot=$RunDir\performance\artifacts\packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Run
dotnet run --project $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore --no-build -- --filter 'System.Memory.Span&lt;Byte&gt;*' --anyCategories Libraries Runtime " --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun.exe --artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --packages $RunDir\performance\artifacts\packages
```

</details>

<details>

### System.Memory.Span&lt;Byte&gt;.EndsWith(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Byte&gt;.SequenceEqual(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Byte&gt;.SequenceCompareTo(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Byte&gt;.LastIndexOfAnyValues(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Byte&gt;.StartsWith(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Byte&gt;.EndsWith(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Byte&gt;.SequenceEqual(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Byte&gt;.SequenceCompareTo(Size: 33)

#### 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 | [a7d6c954808c572be4ac571b779b0ed6897ae24d](https://github.com/dotnet/runtime/commit/a7d6c954808c572be4ac571b779b0ed6897ae24d)
Compare | [ca29ebb973cd64c5c6d510828affe9632584b536](https://github.com/dotnet/runtime/commit/ca29ebb973cd64c5c6d510828affe9632584b536)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a7d6c954808c572be4ac571b779b0ed6897ae24d...ca29ebb973cd64c5c6d510828affe9632584b536)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in System.Tests.Perf_String

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[TrimEnd - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Tests.Perf_String.TrimEnd(s%3a%20%22Test%20%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.String.cs#L138-#L142>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 135.51 ns | 148.16 ns | 1.09 | 0.12 | False | | |
|<ul><li>[TrimEnd_CharArr - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Tests.Perf_String.TrimEnd_CharArr(s%3a%20%22Test%22%2c%20c%3a%20%5b%27%20%27%2c%20%27%e2%80%85%27%5d).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.String.cs#L160-#L165>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 67.76 ns | 90.17 ns | 1.33 | 0.17 | False | | |
|<ul><li>[CtorCharCount - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Tests.Perf_String.CtorCharCount(size%3a%20100).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.String.cs#L23-#L27>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 137.31 ns | 149.18 ns | 1.09 | 0.05 | False | | |
|<ul><li>[TrimStart - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Tests.Perf_String.TrimStart(s%3a%20%22%20Test%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.String.cs#L131-#L136>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 138.58 ns | 149.94 ns | 1.08 | 0.11 | False | | |
|<ul><li>[Remove_Int - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Tests.Perf_String.Remove_Int(s%3a%20%22dzsdzsDDZSDZSDZSddsz%22%2c%20i%3a%2010).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.String.cs#L82-#L88>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 101.04 ns | 117.00 ns | 1.16 | 0.26 | False | | |
|<ul><li>[PadLeft - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Tests.Perf_String.PadLeft(n%3a%202142).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime/Perf.String.cs#L76-#L80>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 1.58 μs | 1.79 μs | 1.13 | 0.03 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Tests.Perf_String_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Tests.Perf_String_002.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Tests.Perf_String_003.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Tests.Perf_String_004.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Tests.Perf_String_005.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Tests.Perf_String_006.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Tests.Perf_String.html>)

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

<details>
<summary>Repro Steps</summary>


#### Prerequisites (Build files either built locally or downloaded from payload above)
- Libraries build extracted to `runtime/artifacts` or build instructions: [Libraries README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/libraries/README.md) args: `-subset libs+libs.tests -rc release -configuration Release -arch $RunArch -framework net8.0`
- CoreCLR product build extracted to `runtime/artifacts/bin/coreclr/$RunOS.$RunArch.Release`, build instructions: [CoreCLR README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/coreclr/README.md) args: `-subset clr+libs -rc release -configuration Release -arch $RunArch -framework net8.0`
- Mono Runtime build extracted to `runtime/artifacts/bin/mono/$RunOS.$RunArch.Release`, build instructions: [MONO README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/mono/README.md) args: `-arch $RunArch -os $RunOS -s mono+libs+host+packs -c Release`
- Dotnet SDK installed for dotnet commands
- Running commands from the runtime folder

Linux
```cmd
# Set $RunDir to the runtime directory
RunDir=`pwd`

# Set the OS, arch, and OSId
RunOS='linux'
RunOSId='linux'
RunArch='x64'

# Create mono dotnet
mkdir -p $RunDir/artifacts/dotnet-mono
$RunDir/build.sh -subset libs.pretest -configuration release -ci -arch $RunArch -testscope innerloop /p:RuntimeArtifactsPath=$RunDir/artifacts/bin/mono/$RunOS.$RunArch.Release /p:RuntimeFlavor=mono
cp $RunDir/artifacts/bin/runtime/net8.0-$RunOS-Release-$RunArch/* $RunDir/artifacts/bin/testhost/net8.0-$RunOS-Release-$RunArch/shared/Microsoft.NETCore.App/8.0.0 -rf
cp $RunDir/artifacts/bin/testhost/net8.0-$RunOS-Release-$RunArch/* $RunDir/artifacts/dotnet-mono -r
cp $RunDir/artifacts/bin/coreclr/$RunOS.$RunArch.Release/corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun

# Create Core Root
$RunDir/src/tests/build.sh release $RunArch generatelayoutonly /p:LibrariesConfiguration=Release

# Clone performance
git clone --branch main --depth 1 --quiet https://github.com/dotnet/performance.git $RunDir/performance

# Use Interpreter
export MONO_ENV_OPTIONS="--interpreter"

# One line run:
python3 $RunDir/performance/scripts/benchmarks_ci.py --csproj $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --incremental no --architecture $RunArch -f net8.0 --filter 'System.Tests.Perf_String*' --bdn-artifacts $RunDir/artifacts/BenchmarkDotNet.Artifacts --bdn-arguments="--anyCategories Libraries Runtime  --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun"

# Individual Commands:
# Restore
dotnet restore $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --packages $RunDir/performance/artifacts/packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Build
dotnet build $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore /p:NuGetPackageRoot=$RunDir/performance/artifacts/packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Run
dotnet run --project $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore --no-build -- --filter 'System.Tests.Perf_String*' --anyCategories Libraries Runtime " --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun --artifacts $RunDir/artifacts/BenchmarkDotNet.Artifacts --packages $RunDir/performance/artifacts/packages
```

Windows
```cmd
# Set $RunDir to the runtime directory
$RunDir="FullPathHere"

# Set the OS, arch, and OSId
RunOS='windows'
RunOSId='win'
RunArch='x64'

# Create mono dotnet
mkdir -p $RunDir/artifacts/dotnet-mono
$RunDir/build.sh -subset libs.pretest -configuration release -ci -arch $RunArch -testscope innerloop /p:RuntimeArtifactsPath=$RunDir\artifacts\bin\mono\$RunOS.$RunArch.Release /p:RuntimeFlavor=mono
xcopy $RunDir\artifacts\bin\runtime\net8.0-$RunOS-Release-$RunArch\ $RunDir\artifacts\bin\testhost\net8.0-$RunOS-Release-$RunArch\shared\Microsoft.NETCore.App\8.0.0\ /e /y
xcopy $RunDir\artifacts\bin\testhost\net8.0-$RunOS-Release-$RunArch\ $RunDir\artifacts\dotnet-mono\ /e /y
xcopy $RunDir\artifacts\bin\coreclr\$RunOS.$RunArch.Release\corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun /y

# Create Core Root
$RunDir\src\tests\build.cmd release $RunArch generatelayoutonly /p:LibrariesConfiguration=Release

# Clone performance
git clone --branch main --depth 1 --quiet https://github.com/dotnet/performance.git $RunDir\performance

# Use Interpreter
export MONO_ENV_OPTIONS="--interpreter"

# One line run:
python3 $RunDir\performance\scripts\benchmarks_ci.py --csproj $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --incremental no --architecture $RunArch -f net8.0 --filter 'System.Tests.Perf_String*' --bdn-artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --bdn-arguments="--anyCategories Libraries Runtime  --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun.exe"

# Individual Commands:
# Restore
dotnet restore $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --packages $RunDir\performance\artifacts\packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Build
dotnet build $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore /p:NuGetPackageRoot=$RunDir\performance\artifacts\packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Run
dotnet run --project $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore --no-build -- --filter 'System.Tests.Perf_String*' --anyCategories Libraries Runtime " --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun.exe --artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --packages $RunDir\performance\artifacts\packages
```

</details>

<details>

### System.Tests.Perf_String.TrimEnd(s: "Test ")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.TrimEnd_CharArr(s: "Test", c: [' ', ' '])

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.CtorCharCount(size: 100)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.TrimStart(s: " Test")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.Remove_Int(s: "dzsdzsDDZSDZSDZSddsz", i: 10)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_String.PadLeft(n: 2142)

#### 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 | [a7d6c954808c572be4ac571b779b0ed6897ae24d](https://github.com/dotnet/runtime/commit/a7d6c954808c572be4ac571b779b0ed6897ae24d)
Compare | [ca29ebb973cd64c5c6d510828affe9632584b536](https://github.com/dotnet/runtime/commit/ca29ebb973cd64c5c6d510828affe9632584b536)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a7d6c954808c572be4ac571b779b0ed6897ae24d...ca29ebb973cd64c5c6d510828affe9632584b536)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in System.Memory.ReadOnlySequence

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Slice_Repeat_StartPosition_And_EndPosition - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Memory.ReadOnlySequence.Slice_Repeat_StartPosition_And_EndPosition(Segment%3a%20Multiple).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/ReadOnlySequence.cs#L89-#L98>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 395.14 ns | 429.10 ns | 1.09 | 0.13 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Memory.ReadOnlySequence_001.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Memory.ReadOnlySequence.html>)

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

<details>
<summary>Repro Steps</summary>


#### Prerequisites (Build files either built locally or downloaded from payload above)
- Libraries build extracted to `runtime/artifacts` or build instructions: [Libraries README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/libraries/README.md) args: `-subset libs+libs.tests -rc release -configuration Release -arch $RunArch -framework net8.0`
- CoreCLR product build extracted to `runtime/artifacts/bin/coreclr/$RunOS.$RunArch.Release`, build instructions: [CoreCLR README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/coreclr/README.md) args: `-subset clr+libs -rc release -configuration Release -arch $RunArch -framework net8.0`
- Mono Runtime build extracted to `runtime/artifacts/bin/mono/$RunOS.$RunArch.Release`, build instructions: [MONO README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/mono/README.md) args: `-arch $RunArch -os $RunOS -s mono+libs+host+packs -c Release`
- Dotnet SDK installed for dotnet commands
- Running commands from the runtime folder

Linux
```cmd
# Set $RunDir to the runtime directory
RunDir=`pwd`

# Set the OS, arch, and OSId
RunOS='linux'
RunOSId='linux'
RunArch='x64'

# Create mono dotnet
mkdir -p $RunDir/artifacts/dotnet-mono
$RunDir/build.sh -subset libs.pretest -configuration release -ci -arch $RunArch -testscope innerloop /p:RuntimeArtifactsPath=$RunDir/artifacts/bin/mono/$RunOS.$RunArch.Release /p:RuntimeFlavor=mono
cp $RunDir/artifacts/bin/runtime/net8.0-$RunOS-Release-$RunArch/* $RunDir/artifacts/bin/testhost/net8.0-$RunOS-Release-$RunArch/shared/Microsoft.NETCore.App/8.0.0 -rf
cp $RunDir/artifacts/bin/testhost/net8.0-$RunOS-Release-$RunArch/* $RunDir/artifacts/dotnet-mono -r
cp $RunDir/artifacts/bin/coreclr/$RunOS.$RunArch.Release/corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun

# Create Core Root
$RunDir/src/tests/build.sh release $RunArch generatelayoutonly /p:LibrariesConfiguration=Release

# Clone performance
git clone --branch main --depth 1 --quiet https://github.com/dotnet/performance.git $RunDir/performance

# Use Interpreter
export MONO_ENV_OPTIONS="--interpreter"

# One line run:
python3 $RunDir/performance/scripts/benchmarks_ci.py --csproj $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --incremental no --architecture $RunArch -f net8.0 --filter 'System.Memory.ReadOnlySequence*' --bdn-artifacts $RunDir/artifacts/BenchmarkDotNet.Artifacts --bdn-arguments="--anyCategories Libraries Runtime  --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun"

# Individual Commands:
# Restore
dotnet restore $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --packages $RunDir/performance/artifacts/packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Build
dotnet build $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore /p:NuGetPackageRoot=$RunDir/performance/artifacts/packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Run
dotnet run --project $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore --no-build -- --filter 'System.Memory.ReadOnlySequence*' --anyCategories Libraries Runtime " --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun --artifacts $RunDir/artifacts/BenchmarkDotNet.Artifacts --packages $RunDir/performance/artifacts/packages
```

Windows
```cmd
# Set $RunDir to the runtime directory
$RunDir="FullPathHere"

# Set the OS, arch, and OSId
RunOS='windows'
RunOSId='win'
RunArch='x64'

# Create mono dotnet
mkdir -p $RunDir/artifacts/dotnet-mono
$RunDir/build.sh -subset libs.pretest -configuration release -ci -arch $RunArch -testscope innerloop /p:RuntimeArtifactsPath=$RunDir\artifacts\bin\mono\$RunOS.$RunArch.Release /p:RuntimeFlavor=mono
xcopy $RunDir\artifacts\bin\runtime\net8.0-$RunOS-Release-$RunArch\ $RunDir\artifacts\bin\testhost\net8.0-$RunOS-Release-$RunArch\shared\Microsoft.NETCore.App\8.0.0\ /e /y
xcopy $RunDir\artifacts\bin\testhost\net8.0-$RunOS-Release-$RunArch\ $RunDir\artifacts\dotnet-mono\ /e /y
xcopy $RunDir\artifacts\bin\coreclr\$RunOS.$RunArch.Release\corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun /y

# Create Core Root
$RunDir\src\tests\build.cmd release $RunArch generatelayoutonly /p:LibrariesConfiguration=Release

# Clone performance
git clone --branch main --depth 1 --quiet https://github.com/dotnet/performance.git $RunDir\performance

# Use Interpreter
export MONO_ENV_OPTIONS="--interpreter"

# One line run:
python3 $RunDir\performance\scripts\benchmarks_ci.py --csproj $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --incremental no --architecture $RunArch -f net8.0 --filter 'System.Memory.ReadOnlySequence*' --bdn-artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --bdn-arguments="--anyCategories Libraries Runtime  --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun.exe"

# Individual Commands:
# Restore
dotnet restore $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --packages $RunDir\performance\artifacts\packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Build
dotnet build $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore /p:NuGetPackageRoot=$RunDir\performance\artifacts\packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Run
dotnet run --project $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore --no-build -- --filter 'System.Memory.ReadOnlySequence*' --anyCategories Libraries Runtime " --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun.exe --artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --packages $RunDir\performance\artifacts\packages
```

</details>

<details>

### System.Memory.ReadOnlySequence.Slice_Repeat_StartPosition_And_EndPosition(Segment: Multiple)

#### 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 | [a7d6c954808c572be4ac571b779b0ed6897ae24d](https://github.com/dotnet/runtime/commit/a7d6c954808c572be4ac571b779b0ed6897ae24d)
Compare | [ca29ebb973cd64c5c6d510828affe9632584b536](https://github.com/dotnet/runtime/commit/ca29ebb973cd64c5c6d510828affe9632584b536)
Diff | [Diff](https://github.com/dotnet/runtime/compare/a7d6c954808c572be4ac571b779b0ed6897ae24d...ca29ebb973cd64c5c6d510828affe9632584b536)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in System.Collections.Concurrent.Count&lt;String&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Stack - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/ViperUbuntu/System.Collections.Concurrent.Count(String).Stack(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Concurrent/Count.cs#L49-#L50>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 1.63 μs | 1.94 μs | 1.19 | 0.35 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_07_2025/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Collections.Concurrent.Count%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_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono/ViperUbuntu_Regression/System.Collections.Concurrent.Count%28String%29.html>)

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

<details>
<summary>Repro Steps</summary>


#### Prerequisites (Build files either built locally or downloaded from payload above)
- Libraries build extracted to `runtime/artifacts` or build instructions: [Libraries README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/libraries/README.md) args: `-subset libs+libs.tests -rc release -configuration Release -arch $RunArch -framework net8.0`
- CoreCLR product build extracted to `runtime/artifacts/bin/coreclr/$RunOS.$RunArch.Release`, build instructions: [CoreCLR README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/coreclr/README.md) args: `-subset clr+libs -rc release -configuration Release -arch $RunArch -framework net8.0`
- Mono Runtime build extracted to `runtime/artifacts/bin/mono/$RunOS.$RunArch.Release`, build instructions: [MONO README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/mono/README.md) args: `-arch $RunArch -os $RunOS -s mono+libs+host+packs -c Release`
- Dotnet SDK installed for dotnet commands
- Running commands from the runtime folder

Linux
```cmd
# Set $RunDir to the runtime directory
RunDir=`pwd`

# Set the OS, arch, and OSId
RunOS='linux'
RunOSId='linux'
RunArch='x64'

# Create mono dotnet
mkdir -p $RunDir/artifacts/dotnet-mono
$RunDir/build.sh -subset libs.pretest -configuration release -ci -arch $RunArch -testscope innerloop /p:RuntimeArtifactsPath=$RunDir/artifacts/bin/mono/$RunOS.$RunArch.Release /p:RuntimeFlavor=mono
cp $RunDir/artifacts/bin/runtime/net8.0-$RunOS-Release-$RunArch/* $RunDir/artifacts/bin/testhost/net8.0-$RunOS-Release-$RunArch/shared/Microsoft.NETCore.App/8.0.0 -rf
cp $RunDir/artifacts/bin/testhost/net8.0-$RunOS-Release-$RunArch/* $RunDir/artifacts/dotnet-mono -r
cp $RunDir/artifacts/bin/coreclr/$RunOS.$RunArch.Release/corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun

# Create Core Root
$RunDir/src/tests/build.sh release $RunArch generatelayoutonly /p:LibrariesConfiguration=Release

# Clone performance
git clone --branch main --depth 1 --quiet https://github.com/dotnet/performance.git $RunDir/performance

# Use Interpreter
export MONO_ENV_OPTIONS="--interpreter"

# One line run:
python3 $RunDir/performance/scripts/benchmarks_ci.py --csproj $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --incremental no --architecture $RunArch -f net8.0 --filter 'System.Collections.Concurrent.Count&lt;String&gt;*' --bdn-artifacts $RunDir/artifacts/BenchmarkDotNet.Artifacts --bdn-arguments="--anyCategories Libraries Runtime  --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun"

# Individual Commands:
# Restore
dotnet restore $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --packages $RunDir/performance/artifacts/packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Build
dotnet build $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore /p:NuGetPackageRoot=$RunDir/performance/artifacts/packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Run
dotnet run --project $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore --no-build -- --filter 'System.Collections.Concurrent.Count&lt;String&gt;*' --anyCategories Libraries Runtime " --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun --artifacts $RunDir/artifacts/BenchmarkDotNet.Artifacts --packages $RunDir/performance/artifacts/packages
```

Windows
```cmd
# Set $RunDir to the runtime directory
$RunDir="FullPathHere"

# Set the OS, arch, and OSId
RunOS='windows'
RunOSId='win'
RunArch='x64'

# Create mono dotnet
mkdir -p $RunDir/artifacts/dotnet-mono
$RunDir/build.sh -subset libs.pretest -configuration release -ci -arch $RunArch -testscope innerloop /p:RuntimeArtifactsPath=$RunDir\artifacts\bin\mono\$RunOS.$RunArch.Release /p:RuntimeFlavor=mono
xcopy $RunDir\artifacts\bin\runtime\net8.0-$RunOS-Release-$RunArch\ $RunDir\artifacts\bin\testhost\net8.0-$RunOS-Release-$RunArch\shared\Microsoft.NETCore.App\8.0.0\ /e /y
xcopy $RunDir\artifacts\bin\testhost\net8.0-$RunOS-Release-$RunArch\ $RunDir\artifacts\dotnet-mono\ /e /y
xcopy $RunDir\artifacts\bin\coreclr\$RunOS.$RunArch.Release\corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun /y

# Create Core Root
$RunDir\src\tests\build.cmd release $RunArch generatelayoutonly /p:LibrariesConfiguration=Release

# Clone performance
git clone --branch main --depth 1 --quiet https://github.com/dotnet/performance.git $RunDir\performance

# Use Interpreter
export MONO_ENV_OPTIONS="--interpreter"

# One line run:
python3 $RunDir\performance\scripts\benchmarks_ci.py --csproj $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --incremental no --architecture $RunArch -f net8.0 --filter 'System.Collections.Concurrent.Count&lt;String&gt;*' --bdn-artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --bdn-arguments="--anyCategories Libraries Runtime  --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun.exe"

# Individual Commands:
# Restore
dotnet restore $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --packages $RunDir\performance\artifacts\packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Build
dotnet build $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore /p:NuGetPackageRoot=$RunDir\performance\artifacts\packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Run
dotnet run --project $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore --no-build -- --filter 'System.Collections.Concurrent.Count&lt;String&gt;*' --anyCategories Libraries Runtime " --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun.exe --artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --packages $RunDir\performance\artifacts\packages
```

</details>

<details>

### System.Collections.Concurrent.Count&lt;String&gt;.Stack(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	x64
OS	ubuntu 22.04
Queue	ViperUbuntu
Baseline	a7d6c954808c572be4ac571b779b0ed6897ae24d
Compare	ca29ebb973cd64c5c6d510828affe9632584b536
Diff	Diff
Configs	CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
EndsWith - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	86.18 ns	98.44 ns	1.14	0.16	False
SequenceEqual - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	74.00 ns	80.77 ns	1.09	0.24	False
SequenceCompareTo - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	419.19 ns	491.68 ns	1.17	0.33	False
LastIndexOfAnyValues - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	340.64 ns	382.46 ns	1.12	0.21	False
StartsWith - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	238.11 ns	284.06 ns	1.19	0.42	False
EndsWith - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	245.27 ns	317.02 ns	1.29	0.26	False
SequenceEqual - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	391.93 ns	521.30 ns	1.33	0.34	False
SequenceCompareTo - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	82.12 ns	89.81 ns	1.09	0.20	False

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
TrimEnd - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	135.51 ns	148.16 ns	1.09	0.12	False
TrimEnd_CharArr - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	67.76 ns	90.17 ns	1.33	0.17	False
CtorCharCount - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	137.31 ns	149.18 ns	1.09	0.05	False
TrimStart - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	138.58 ns	149.94 ns	1.08	0.11	False
Remove_Int - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	101.04 ns	117.00 ns	1.16	0.26	False
PadLeft - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	1.58 μs	1.79 μs	1.13	0.03	False

[Perf] Linux/x64: 16 Regressions on 10/1/2025 10:50:57 PM +00:00 #63505

Description

Run Information

Regressions in System.Memory.Span<Byte>

Repro

Prerequisites (Build files either built locally or downloaded from payload above)

System.Memory.Span<Byte>.EndsWith(Size: 33)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Byte>.SequenceEqual(Size: 33)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Byte>.SequenceCompareTo(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Byte>.LastIndexOfAnyValues(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Byte>.StartsWith(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Byte>.EndsWith(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Byte>.SequenceEqual(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Byte>.SequenceCompareTo(Size: 33)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.Tests.Perf_String

Repro

Prerequisites (Build files either built locally or downloaded from payload above)

System.Tests.Perf_String.TrimEnd(s: "Test ")

ETL Files

Histogram

JIT Disasms

System.Tests.Perf_String.TrimEnd_CharArr(s: "Test", c: [' ', ' '])

ETL Files

Histogram

JIT Disasms

System.Tests.Perf_String.CtorCharCount(size: 100)

ETL Files

Histogram

JIT Disasms

System.Tests.Perf_String.TrimStart(s: " Test")

ETL Files

Histogram

JIT Disasms

System.Tests.Perf_String.Remove_Int(s: "dzsdzsDDZSDZSDZSddsz", i: 10)

ETL Files

Histogram

JIT Disasms

System.Tests.Perf_String.PadLeft(n: 2142)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.Memory.ReadOnlySequence

Repro

Prerequisites (Build files either built locally or downloaded from payload above)

System.Memory.ReadOnlySequence.Slice_Repeat_StartPosition_And_EndPosition(Segment: Multiple)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.Collections.Concurrent.Count<String>

Repro