[Perf] Linux/x64: 201 Regressions on 10/1/2025 6:19:34 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [201b515d1e646f689efbee52c3585e85d4c3cbf4](https://github.com/dotnet/runtime/commit/201b515d1e646f689efbee52c3585e85d4c3cbf4)
Compare | [1390e22bd17e06147dfd382c733b591aa9fb8d28](https://github.com/dotnet/runtime/commit/1390e22bd17e06147dfd382c733b591aa9fb8d28)
Diff | [Diff](https://github.com/dotnet/runtime/compare/201b515d1e646f689efbee52c3585e85d4c3cbf4...1390e22bd17e06147dfd382c733b591aa9fb8d28)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in PerfLabTests.DelegatePerf

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[DelegateInvoke - 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/PerfLabTests.DelegatePerf.DelegateInvoke.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/runtime/perflab/DelegatePerf.cs#L32-#L44>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 2.75 ms | 3.15 ms | 1.15 | 0.16 | 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/PerfLabTests.DelegatePerf_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/PerfLabTests.DelegatePerf.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 'PerfLabTests.DelegatePerf*' --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 'PerfLabTests.DelegatePerf*' --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 'PerfLabTests.DelegatePerf*' --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 'PerfLabTests.DelegatePerf*' --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>

### PerfLabTests.DelegatePerf.DelegateInvoke

#### 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 | [201b515d1e646f689efbee52c3585e85d4c3cbf4](https://github.com/dotnet/runtime/commit/201b515d1e646f689efbee52c3585e85d4c3cbf4)
Compare | [1390e22bd17e06147dfd382c733b591aa9fb8d28](https://github.com/dotnet/runtime/commit/1390e22bd17e06147dfd382c733b591aa9fb8d28)
Diff | [Diff](https://github.com/dotnet/runtime/compare/201b515d1e646f689efbee52c3585e85d4c3cbf4...1390e22bd17e06147dfd382c733b591aa9fb8d28)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in Microsoft.Extensions.Primitives.StringSegmentBenchmark

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Equals_Valid - 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/Microsoft.Extensions.Primitives.StringSegmentBenchmark.Equals_Valid.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/Microsoft.Extensions.Primitives/StringSegmentBenchmark.cs#L52-#L54>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=H4sIAAAAAAAACmVSTW8TMRC9R8p/MLlsIrbZVUT6EWSJtkSAaARqonKszO5sMuC1w3jcJqL8d8ab5AKXsfw882beG1tgxRBYafUuW2BFPviGx/MdgwvoXRh/JWyR8QnCeMmEbr2EdQuOb8BVm9bQz/H8VzQ2PD4Yi3X2tt+zwmkaBhLS2jAwtjCclJPpWXl5Vl6sysvZ9HxWTsbnV1eT6cWb12U5K8vRsZJg66Uwqz074IKiS/Un3u9kpG16J2hCsQFTh6I16E4JlXcNrlPnvTMtVsPf2a1vt2gNi5yFryGbqYwRCOosV9nd3cMiIY1IgAQsvPPXX1b/YZ+cKNoSSOwYKHZP99F9RlcnSLqRf2wlN/uT1HwA/oiBPWFl7HvD5hvyJg1jCINYO0zG6xTyg1+6i3lngU4hP+rVhyM/qtOHY9Tvvagt+R9QsVoCIYRc3US09UocW7Jpt7mSrUTQK2ly68VKoHsI0fL1E5BZQ79XFC/qeSNuHBnUKyFnMTSowYD9fFfZWMNgoIpCzXdCaUH5RjVohUt+g/JRtq1CV5wGInC1rD4trdoYYvUsqtXwkKBPY+4qb2Pr9L/j7g940N3cksfIFnQm9iW798frAkyIBOkfZqO/Z2oXvcQCAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=>)</li></ul> | 113.75 ns | 132.43 ns | 1.16 | 0.15 | False | | |
|<ul><li>[IndexOf - 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/Microsoft.Extensions.Primitives.StringSegmentBenchmark.IndexOf.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/Microsoft.Extensions.Primitives/StringSegmentBenchmark.cs#L74-#L75>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 98.07 ns | 106.31 ns | 1.08 | 0.13 | False | | |
|<ul><li>[Equals_Object_Valid - 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/Microsoft.Extensions.Primitives.StringSegmentBenchmark.Equals_Object_Valid.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/Microsoft.Extensions.Primitives/StringSegmentBenchmark.cs#L48-#L50>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 123.62 ns | 144.86 ns | 1.17 | 0.16 | False | | |
|<ul><li>[GetSegmentHashCode - 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/Microsoft.Extensions.Primitives.StringSegmentBenchmark.GetSegmentHashCode.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/Microsoft.Extensions.Primitives/StringSegmentBenchmark.cs#L59-#L60>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 100.96 ns | 108.62 ns | 1.08 | 0.10 | False | | |
|<ul><li>[Equals_String - 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/Microsoft.Extensions.Primitives.StringSegmentBenchmark.Equals_String.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/Microsoft.Extensions.Primitives/StringSegmentBenchmark.cs#L56-#L57>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 92.63 ns | 115.33 ns | 1.25 | 0.18 | False | | |
|<ul><li>[SubSegment - 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/Microsoft.Extensions.Primitives.StringSegmentBenchmark.SubSegment.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/Microsoft.Extensions.Primitives/StringSegmentBenchmark.cs#L71-#L72>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 35.21 ns | 41.58 ns | 1.18 | 0.23 | 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/Microsoft.Extensions.Primitives.StringSegmentBenchmark_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/Microsoft.Extensions.Primitives.StringSegmentBenchmark_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/Microsoft.Extensions.Primitives.StringSegmentBenchmark_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/Microsoft.Extensions.Primitives.StringSegmentBenchmark_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/Microsoft.Extensions.Primitives.StringSegmentBenchmark_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/Microsoft.Extensions.Primitives.StringSegmentBenchmark_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/Microsoft.Extensions.Primitives.StringSegmentBenchmark.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 'Microsoft.Extensions.Primitives.StringSegmentBenchmark*' --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 'Microsoft.Extensions.Primitives.StringSegmentBenchmark*' --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 'Microsoft.Extensions.Primitives.StringSegmentBenchmark*' --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 'Microsoft.Extensions.Primitives.StringSegmentBenchmark*' --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>

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.Equals_Valid

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.IndexOf

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.Equals_Object_Valid

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.GetSegmentHashCode

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.Equals_String

#### ETL Files

#### Histogram

#### JIT Disasms

### Microsoft.Extensions.Primitives.StringSegmentBenchmark.SubSegment

#### 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 | [201b515d1e646f689efbee52c3585e85d4c3cbf4](https://github.com/dotnet/runtime/commit/201b515d1e646f689efbee52c3585e85d4c3cbf4)
Compare | [1390e22bd17e06147dfd382c733b591aa9fb8d28](https://github.com/dotnet/runtime/commit/1390e22bd17e06147dfd382c733b591aa9fb8d28)
Diff | [Diff](https://github.com/dotnet/runtime/compare/201b515d1e646f689efbee52c3585e85d4c3cbf4...1390e22bd17e06147dfd382c733b591aa9fb8d28)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in System.Memory.Span&lt;Int32&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<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(Int32).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> | 142.95 ns | 163.24 ns | 1.14 | 0.32 | False | | |
|<ul><li>[Fill - 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(Int32).Fill(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L43-#L44>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 571.91 ns | 750.20 ns | 1.31 | 0.57 | 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(Int32).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=H4sIAAAAAAAACmVRUW/TMBB+r9T/cPTFrciakGqsChgxRgUTq5CWajwik1waI8eO7Atr2Pjv2En6Ai9n+bv7vrv7TiEBoSPg8J7lvSNs1ntsjO3XeSv021tNm/TdeqdL901Svczlb8xgs1mxN/OZ8mRREVrPLgUhyQaXaZJeXiTbi+TqkGyzy6ss3a7T9PV282rzMkmyJFlNTIut8URWGtJIse104J91f1ihizrkLVYurlGULm6E1OeCwuhKHkPnXotGFssndmOaVipB0ui9KZFlwEiixZJFwO7uHvYBqYRyGIC90eb66+E/zK+MtrXo46BguyF13+kvUpcB8t2s+d74WvYnbPMJ6bN0ZKwshPooSASrwjDCSme0WwaHeQjR6BcfYjRYwEOIpn35+ETTdnx8VvPZM7TW/MSCIEcr0UXwoZOqPHjHchJNG8GDUB3yg29yY7yVaO/RdYquf6EVR5zP4vgZHmvvxqQAL7w4eUMdLBZkdqdCdSUuFhDHsDt5SYVgKqik8lpSH8F0/trgBnIYyKIu/enD0YpaWIJHvzUsxwJ+HvNUGNU1mv87bj/ijg9z+zqSpJAzb1+wu5++exSus9igJrb6CzJ4y8etAgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=>)</li></ul> | 121.85 ns | 146.33 ns | 1.20 | 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(Int32).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> | 1.44 μs | 1.84 μs | 1.28 | 0.45 | 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(Int32).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> | 877.97 ns | 1.05 μs | 1.20 | 0.42 | False | | |
|<ul><li>[Fill - 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(Int32).Fill(Size%3a%2033).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L43-#L44>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 66.31 ns | 74.09 ns | 1.12 | 0.34 | 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(Int32).StartsWith(Size%3a%2033).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> | 103.67 ns | 120.10 ns | 1.16 | 0.23 | 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(Int32).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=H4sIAAAAAAAACmVSUW/TMBB+r9T/cPTFrciarFtLFTBibBNDrEJaqvGITHJpjRw7si+she2/c07bF3g5y+f7vvvuOxskIAwEEj6IYh8Im+kKG+f306JV9t1nSxez99OClKfwTdN2XOjfmMP8fDYRb4cDw3hVE3omqBQh6QbHs2w2P8uWZ9mbdbbM58v8fDldXM4vLheL11mWZ9nkiPTYOgaKypFFSn1nI/7E+8MrW27ju8c6pFtUVUgbpe2poHS21pvYeW9Vo8vxH3HtmlYbRdrZlatQ5CBIo8dKJCDu7x9XMVMrEzAmVs66q6/r/3I8NfrWI8eewXf900Nnv2hbxRR38+57w7XiJU7zCelOB3Jel8rcKFLRqyhGeR2cDeNosowhOfgl+5j0FsgYkuO88nAkx+nk4ZgMB8/QevcTS4ICvcaQwMdOm2rNjvF6mjaBR2U6lGtucu3YSvQPGDpDV7/Qqw0OB2n6DE9bduPIAK+YnNjQAKMRudtdaboKRyNIU7jdMaVBcDXU2jCXthtwHW8bQg+Ogjzailcfl1Zu+YfAE08N40OBPMnclc50jZX/yt0f8kH2urmONBmUgu2Ldu+P1xWq0Hls0JKY/AVuVtSnsAIAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=>)</li></ul> | 813.65 ns | 923.34 ns | 1.13 | 0.48 | 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%28Int32%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%28Int32%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%28Int32%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%28Int32%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%28Int32%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%28Int32%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%28Int32%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%28Int32%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%28Int32%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;Int32&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;Int32&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;Int32&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;Int32&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;Int32&gt;.SequenceEqual(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Int32&gt;.Fill(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Int32&gt;.EndsWith(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Int32&gt;.SequenceEqual(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Int32&gt;.EndsWith(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Int32&gt;.Fill(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Int32&gt;.StartsWith(Size: 33)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Memory.Span&lt;Int32&gt;.StartsWith(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 | [201b515d1e646f689efbee52c3585e85d4c3cbf4](https://github.com/dotnet/runtime/commit/201b515d1e646f689efbee52c3585e85d4c3cbf4)
Compare | [1390e22bd17e06147dfd382c733b591aa9fb8d28](https://github.com/dotnet/runtime/commit/1390e22bd17e06147dfd382c733b591aa9fb8d28)
Diff | [Diff](https://github.com/dotnet/runtime/compare/201b515d1e646f689efbee52c3585e85d4c3cbf4...1390e22bd17e06147dfd382c733b591aa9fb8d28)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in BenchmarksGame.PiDigits_3

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[RunBench - 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/BenchmarksGame.PiDigits_3.RunBench(n%3a%203000%2c%20expected%3a%20%228649423196%5ct%3a3000%22).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/runtime/BenchmarksGame/pidigits-3.cs#L139-#L142>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 5.98 secs | 6.30 secs | 1.05 | 0.02 | 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/BenchmarksGame.PiDigits_3_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/BenchmarksGame.PiDigits_3.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 'BenchmarksGame.PiDigits_3*' --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 'BenchmarksGame.PiDigits_3*' --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 'BenchmarksGame.PiDigits_3*' --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 'BenchmarksGame.PiDigits_3*' --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>

### BenchmarksGame.PiDigits_3.RunBench(n: 3000, expected: "8649423196\t:3000")

#### 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	201b515d1e646f689efbee52c3585e85d4c3cbf4
Compare	1390e22bd17e06147dfd382c733b591aa9fb8d28
Diff	Diff
Configs	CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
Equals_Valid - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	113.75 ns	132.43 ns	1.16	0.15	False
IndexOf - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	98.07 ns	106.31 ns	1.08	0.13	False
Equals_Object_Valid - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	123.62 ns	144.86 ns	1.17	0.16	False
GetSegmentHashCode - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	100.96 ns	108.62 ns	1.08	0.10	False
Equals_String - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	92.63 ns	115.33 ns	1.25	0.18	False
SubSegment - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	35.21 ns	41.58 ns	1.18	0.23	False

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
SequenceEqual - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	142.95 ns	163.24 ns	1.14	0.32	False
Fill - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	571.91 ns	750.20 ns	1.31	0.57	False
EndsWith - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	121.85 ns	146.33 ns	1.20	0.16	False
SequenceEqual - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	1.44 μs	1.84 μs	1.28	0.45	False
EndsWith - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	877.97 ns	1.05 μs	1.20	0.42	False
Fill - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	66.31 ns	74.09 ns	1.12	0.34	False
StartsWith - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	103.67 ns	120.10 ns	1.16	0.23	False
StartsWith - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	813.65 ns	923.34 ns	1.13	0.48	False

[Perf] Linux/x64: 201 Regressions on 10/1/2025 6:19:34 PM +00:00 #63504

Description

Run Information

Regressions in PerfLabTests.DelegatePerf

Repro

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

PerfLabTests.DelegatePerf.DelegateInvoke

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in Microsoft.Extensions.Primitives.StringSegmentBenchmark

Repro

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

Microsoft.Extensions.Primitives.StringSegmentBenchmark.Equals_Valid

ETL Files

Histogram

JIT Disasms

Microsoft.Extensions.Primitives.StringSegmentBenchmark.IndexOf

ETL Files

Histogram

JIT Disasms

Microsoft.Extensions.Primitives.StringSegmentBenchmark.Equals_Object_Valid

ETL Files

Histogram

JIT Disasms

Microsoft.Extensions.Primitives.StringSegmentBenchmark.GetSegmentHashCode

ETL Files

Histogram

JIT Disasms

Microsoft.Extensions.Primitives.StringSegmentBenchmark.Equals_String

ETL Files

Histogram

JIT Disasms

Microsoft.Extensions.Primitives.StringSegmentBenchmark.SubSegment

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.Memory.Span<Int32>

Repro

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

System.Memory.Span<Int32>.SequenceEqual(Size: 33)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Int32>.Fill(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Int32>.EndsWith(Size: 33)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Int32>.SequenceEqual(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Int32>.EndsWith(Size: 512)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Int32>.Fill(Size: 33)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Int32>.StartsWith(Size: 33)

ETL Files

Histogram

JIT Disasms

System.Memory.Span<Int32>.StartsWith(Size: 512)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in BenchmarksGame.PiDigits_3

Repro