[Perf] Linux/x64: 14 Regressions on 10/3/2023 8:04:03 PM

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | TigerUbuntu
Baseline | [7abea9ea6ac3cde23fe1a890338e22a5a58a51b6](https://github.com/dotnet/runtime/commit/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6)
Compare | [1d352cb36c06a16bc93e424809fb431d5795e741](https://github.com/dotnet/runtime/commit/1d352cb36c06a16bc93e424809fb431d5795e741)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6...1d352cb36c06a16bc93e424809fb431d5795e741)
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>[LastIndexOfValue - 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/System.Memory.Span(Byte).LastIndexOfValue(Size%3a%2033).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L93-#L94>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 60.48 ns | 397.71 ns | 6.58 | 0.18 | True | | |
|<ul><li>[LastIndexOfValue - 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/System.Memory.Span(Byte).LastIndexOfValue(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L93-#L94>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=H4sIAAAAAAAACpVUXW+bMBR9j7T/4DdgIxTodzYqpd1DqzXrVrLuoaoqF26CN2yja7Mk07TfvgtJ25CunSYEwtfnHN/je+0SLEsLjfYjl2BYwnJu6bkrwb2s1ecaahgYi0JNfdaOGtwq4rHrnvNVqFzPTBCFwVDmeztBHJ7GwcWsDD4BThyfOTOh+vO9nT6XueP/hRAdnkbBWEwBn1CEslA2pC93tbI1aYc7wRAlse6hJUF5EyH9ChDW0XGDbtfoypfPyEcHzxOigy5l3cZDQkFaPxpYZmUowjNYp6SAP0i862O26aN387Y3Ak58kKCs6f1is4Im2HEtyvwSKs2ShDm5tgrsFpIBIYnVQR0jV1nR4hAmZqsAnpstyYXaAA4xK4SFzNJqLZy8OkzjM7Ntoo8SYzBt/7Rz6cJYkMEIpMZFkFZcvTteWDgKzrmxZyqH+cXkipc1uKn4CQO2G8XeoxQ13YlWEzGtkVuhlbl2TrSsRNmORjoH54Ylv5ljBcFz59VLzPPzq9EKPuGlgZfRI6308GL8f4Qz6gesEOh7nxjW/+BR6AO1wgovRYb6VpJWd0NPNJUUcKyr1V+3YmOqdmqpV9hRc2ahqb4bh/F2P9zvR+E4PBiE+4M4Dnb39g/pfROGgzD0SMTUUnKkvWccp7eSz91WsCmgz1577G6xsYL/UGC/sdNeA6RTof5GPfEEfAmmLm2ClHXurjlZxofU+nxKStteR+2bFop9p21JhFKA65eSVutABOohZI3frOBo2UzYgrkGUIBJHu4on80zXdZSJZv5LZZxkywTIqAVtoTEeU/bSEdxsRo2FOYq4zUxU5XCJnwOxvsDZbH5fzMFAAA=>)</li></ul> | 256.92 ns | 3.14 μs | 12.23 | 0.08 | True | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Memory.Span%28Byte%29_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Memory.Span%28Byte%29_2.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_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>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-0cd4f673-e497-408a-9f82-a073c3dea3954786fbe329d4f00ba/de3000d2-18d2-4336-b434-c043947bc04b.zip?sv=2021-08-06&se=2023-11-02T11%3A45%3A27Z&sr=c&sp=rl&sig=TYAXwEZwpITn75xPuk905xGp%2B6O4FfL0APLJOhTKkOc%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-401f6f05-15f2-4291-8ea7-3354c0fc84150ae6de6b8e74389b4/0fc1d057-dedf-40bb-a074-f5a337e9c673.zip?sv=2021-08-06&se=2023-11-03T02%3A19%3A36Z&sr=c&sp=rl&sig=fyAvkkBESDnErVGLvMM%2BdvXEflbDbqKG%2BXZ21MSPlpQ%3D>)
### System.Memory.Span&lt;Byte&gt;.LastIndexOfValue(Size: 33)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 397.71136071466543 > 64.33447055628001.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -189.2455527947637 (T) = (0 -403.05511784883623) / Math.Sqrt((3.0142742390094726 / (23)) + (65.5663766701062 / (21))) is less than -2.0180817028167235 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (23) + (21) - 2, .025) and -5.530742921119259 = (61.716579984403886 - 403.05511784883623) / 61.716579984403886 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```
#### JIT Disasms

### System.Memory.Span&lt;Byte&gt;.LastIndexOfValue(Size: 512)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 3.1410916589103994 > 268.29530563977085.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -246.82954960363776 (T) = (0 -2938.594397480665) / Math.Sqrt((1.390864280518092 / (23)) + (2480.250044421032 / (21))) is less than -2.0180817028167235 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (23) + (21) - 2, .025) and -10.504251481635073 = (255.43551461576791 - 2938.594397480665) / 255.43551461576791 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```
#### JIT Disasms



### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | TigerUbuntu
Baseline | [7abea9ea6ac3cde23fe1a890338e22a5a58a51b6](https://github.com/dotnet/runtime/commit/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6)
Compare | [1d352cb36c06a16bc93e424809fb431d5795e741](https://github.com/dotnet/runtime/commit/1d352cb36c06a16bc93e424809fb431d5795e741)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6...1d352cb36c06a16bc93e424809fb431d5795e741)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in System.IO.Tests.Perf_Path

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[GetFileName - 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/System.IO.Tests.Perf_Path.GetFileName.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime.Extensions/Perf.Path.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> | 237.71 ns | 388.59 ns | 1.63 | 0.13 | True | | |
|<ul><li>[GetFileNameWithoutExtension - 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/System.IO.Tests.Perf_Path.GetFileNameWithoutExtension.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Runtime.Extensions/Perf.Path.cs#L55-#L56>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=H4sIAAAAAAAACpVU227aQBB9R+o/7JuhNY4NKFAqVyLpJVFDkwJtHqIo2tgD3nQv1l4KVFW/vWNDEpuUVJUlyztzztk5O+PlYMk0U9p+pgIMiUlKLT63HJoTJ784cDA0VjO58Em5KnDbSItcNbxLJlO1NEEUBiORHvaCTnjSCc6XPLgAPfd84i2ZbK8Oe20qUs//CyF6fRIFM7YA/YTCpAVekL7eOmkdaoe9YKQFsu6hHKG0iKB+Dhqq6E6BLveoy/M98tFgPyEa1ClVGw8FBVP3aGBTlcEITaBKmYL+geJ1H8tdH43rN40xUOSDAGlN4xdZZpggR47xdAK5InFMvFRZCfZAowEmkFVDHWkqk6zEaZibgwxoag4EZXIHONJJxiwkFncr4ejVI0rvyZaFPkrMwJTzU+ama2NBBKfnQRE2pcGbC2qz4CPYD4yXE3TJbKacfb+yIA1TlXJw6o6VnLOF09Rixlx5x0rkjJersUrBuybxb+JZhvDUe/Ec8+zs23gLn1Nu4Hn0WEk1Op/9H+EUB0LnGvB9X5h2/+Bh6BPOwhYvWKLVjUCt+okeK+wp6JnKt1/1ls2w3VOLw0LeFj8tFO1vdsJOtx3221E4CwfDsD/sdYMo6g86vf6rMByGYQtFjBOCavYTCNWLG0FXzVKw6ItPXrbI7XpnB/+hw35hp7wHUCfX6g6H4gl4AsZxG2usOm1WnGziI5x9ukClbqumdqeYJN/xWGImJejqraRkFahBppgv/CYZ1ZYscZhI04BmYOKHS8onq0RxJ2S8W996EzfxpiAEWmY5xN47PEb8F9fbZUEhTWlaRczknNmYrsC0/gA3iLtGNAUAAA==>)</li></ul> | 311.73 ns | 524.99 ns | 1.68 | 0.10 | True | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.IO.Tests.Perf_Path_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.IO.Tests.Perf_Path_2.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.IO.Tests.Perf_Path.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.IO.Tests.Perf_Path*' --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.IO.Tests.Perf_Path*' --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.IO.Tests.Perf_Path*' --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.IO.Tests.Perf_Path*' --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>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-0cd4f673-e497-408a-9f82-a073c3dea3954786fbe329d4f00ba/de3000d2-18d2-4336-b434-c043947bc04b.zip?sv=2021-08-06&se=2023-11-02T11%3A45%3A27Z&sr=c&sp=rl&sig=TYAXwEZwpITn75xPuk905xGp%2B6O4FfL0APLJOhTKkOc%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-401f6f05-15f2-4291-8ea7-3354c0fc84150ae6de6b8e74389b4/0fc1d057-dedf-40bb-a074-f5a337e9c673.zip?sv=2021-08-06&se=2023-11-03T02%3A19%3A36Z&sr=c&sp=rl&sig=fyAvkkBESDnErVGLvMM%2BdvXEflbDbqKG%2BXZ21MSPlpQ%3D>)
### System.IO.Tests.Perf_Path.GetFileName

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 388.59139044516826 > 252.25442797254843.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -56.87573249911704 (T) = (0 -387.95097047268945) / Math.Sqrt((22.407895948625338 / (23)) + (116.18055560608471 / (21))) is less than -2.0180817028167235 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (23) + (21) - 2, .025) and -0.5973512315838152 = (242.87142539591997 - 387.95097047268945) / 242.87142539591997 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```
#### JIT Disasms

### System.IO.Tests.Perf_Path.GetFileNameWithoutExtension

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 524.9882787934918 > 327.1492849840699.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -44.45335062397346 (T) = (0 -541.2040081525383) / Math.Sqrt((64.71773905614282 / (23)) + (506.8376512978537 / (21))) is less than -2.0180817028167235 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (23) + (21) - 2, .025) and -0.7433666769552156 = (310.43613217257854 - 541.2040081525383) / 310.43613217257854 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```
#### JIT Disasms



### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | TigerUbuntu
Baseline | [7abea9ea6ac3cde23fe1a890338e22a5a58a51b6](https://github.com/dotnet/runtime/commit/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6)
Compare | [1d352cb36c06a16bc93e424809fb431d5795e741](https://github.com/dotnet/runtime/commit/1d352cb36c06a16bc93e424809fb431d5795e741)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6...1d352cb36c06a16bc93e424809fb431d5795e741)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in System.Xml.Linq.Perf_XName

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[CreateElementWithNamespaceImplicitOperator - 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/System.Xml.Linq.Perf_XName.CreateElementWithNamespaceImplicitOperator.html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Xml.Linq/Perf.XName.cs#L22-#L23>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 794.45 ns | 883.37 ns | 1.11 | 0.03 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Xml.Linq.Perf_XName_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Xml.Linq.Perf_XName.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.Xml.Linq.Perf_XName*' --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.Xml.Linq.Perf_XName*' --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.Xml.Linq.Perf_XName*' --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.Xml.Linq.Perf_XName*' --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>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-0cd4f673-e497-408a-9f82-a073c3dea3954786fbe329d4f00ba/de3000d2-18d2-4336-b434-c043947bc04b.zip?sv=2021-08-06&se=2023-11-02T11%3A45%3A27Z&sr=c&sp=rl&sig=TYAXwEZwpITn75xPuk905xGp%2B6O4FfL0APLJOhTKkOc%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-401f6f05-15f2-4291-8ea7-3354c0fc84150ae6de6b8e74389b4/0fc1d057-dedf-40bb-a074-f5a337e9c673.zip?sv=2021-08-06&se=2023-11-03T02%3A19%3A36Z&sr=c&sp=rl&sig=fyAvkkBESDnErVGLvMM%2BdvXEflbDbqKG%2BXZ21MSPlpQ%3D>)
### System.Xml.Linq.Perf_XName.CreateElementWithNamespaceImplicitOperator

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 883.372877953659 > 835.5046779884836.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -20.058625849679544 (T) = (0 -877.2965956603524) / Math.Sqrt((53.87609751788022 / (23)) + (274.2785734374012 / (21))) is less than -2.0180817028167235 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (23) + (21) - 2, .025) and -0.09858120341579611 = (798.5723703742536 - 877.2965956603524) / 798.5723703742536 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```
#### JIT Disasms



### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | TigerUbuntu
Baseline | [7abea9ea6ac3cde23fe1a890338e22a5a58a51b6](https://github.com/dotnet/runtime/commit/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6)
Compare | [1d352cb36c06a16bc93e424809fb431d5795e741](https://github.com/dotnet/runtime/commit/1d352cb36c06a16bc93e424809fb431d5795e741)
Diff | [Diff](https://github.com/dotnet/runtime/compare/7abea9ea6ac3cde23fe1a890338e22a5a58a51b6...1d352cb36c06a16bc93e424809fb431d5795e741)
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>[LastIndexOfValue - 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/System.Memory.Span(Int32).LastIndexOfValue(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L93-#L94>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 944.16 ns | 5.07 μs | 5.37 | 0.06 | True | | |
|<ul><li>[LastIndexOfValue - 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/System.Memory.Span(Int32).LastIndexOfValue(Size%3a%204).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L93-#L94>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 42.16 ns | 89.49 ns | 2.12 | 0.25 | True | | |
|<ul><li>[LastIndexOfValue - 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/System.Memory.Span(Int32).LastIndexOfValue(Size%3a%2033).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Memory/Span.cs#L93-#L94>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 107.76 ns | 423.09 ns | 3.93 | 0.17 | True | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Memory.Span%28Int32%29_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Memory.Span%28Int32%29_2.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Memory.Span%28Int32%29_3.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_x64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_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>


### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-0cd4f673-e497-408a-9f82-a073c3dea3954786fbe329d4f00ba/de3000d2-18d2-4336-b434-c043947bc04b.zip?sv=2021-08-06&se=2023-11-02T11%3A45%3A27Z&sr=c&sp=rl&sig=TYAXwEZwpITn75xPuk905xGp%2B6O4FfL0APLJOhTKkOc%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-401f6f05-15f2-4291-8ea7-3354c0fc84150ae6de6b8e74389b4/0fc1d057-dedf-40bb-a074-f5a337e9c673.zip?sv=2021-08-06&se=2023-11-03T02%3A19%3A36Z&sr=c&sp=rl&sig=fyAvkkBESDnErVGLvMM%2BdvXEflbDbqKG%2BXZ21MSPlpQ%3D>)
### System.Memory.Span&lt;Int32&gt;.LastIndexOfValue(Size: 512)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 5.0671871465847955 > 991.6764153986129.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -230.5613935734636 (T) = (0 -5146.390116649268) / Math.Sqrt((2628.030321060652 / (23)) + (4533.345099691136 / (21))) is less than -2.0180817028167235 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (23) + (21) - 2, .025) and -4.376656518087421 = (957.172938114324 - 5146.390116649268) / 957.172938114324 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```
#### JIT Disasms

### System.Memory.Span&lt;Int32&gt;.LastIndexOfValue(Size: 4)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 89.48576259905823 > 43.54666237706443.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -53.13177922777004 (T) = (0 -94.46973619371741) / Math.Sqrt((0.7507153852309176 / (23)) + (20.332538496754676 / (21))) is less than -2.0180817028167235 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (23) + (21) - 2, .025) and -1.2865599641728707 = (41.315223599609574 - 94.46973619371741) / 41.315223599609574 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```
#### JIT Disasms

### System.Memory.Span&lt;Int32&gt;.LastIndexOfValue(Size: 33)

#### ETL Files

#### Histogram

#### Description of detection logic
```
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 423.08919944974735 > 113.8718943951145.
IsChangePoint: Marked as a change because one of 10/3/2023 2:46:17 PM, 10/9/2023 8:09:24 PM falls between 10/1/2023 7:44:15 AM and 10/9/2023 8:09:24 PM.
IsRegressionStdDev: Marked as regression because -157.7362376288014 (T) = (0 -434.6710861962908) / Math.Sqrt((1.9254479914001583 / (23)) + (87.61342069650205 / (21))) is less than -2.0180817028167235 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (23) + (21) - 2, .025) and -2.9780146553750284 = (109.26834711605959 - 434.6710861962908) / 109.26834711605959 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```
#### 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	TigerUbuntu
Baseline	7abea9ea6ac3cde23fe1a890338e22a5a58a51b6
Compare	1d352cb36c06a16bc93e424809fb431d5795e741
Diff	Diff
Configs	CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	60.48 ns	397.71 ns	6.58	0.18	True
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	256.92 ns	3.14 μs	12.23	0.08	True

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
GetFileName - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	237.71 ns	388.59 ns	1.63	0.13	True
GetFileNameWithoutExtension - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	311.73 ns	524.99 ns	1.68	0.10	True

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	944.16 ns	5.07 μs	5.37	0.06	True
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	42.16 ns	89.49 ns	2.12	0.25	True
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	107.76 ns	423.09 ns	3.93	0.17	True

[Perf] Linux/x64: 14 Regressions on 10/3/2023 8:04:03 PM #22914

Description

Run Information

Regressions in System.Memory.Span<Byte>

Repro

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

Payloads

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

ETL Files

Histogram

Description of detection logic

JIT Disasms

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

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in System.IO.Tests.Perf_Path

Repro

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

Payloads

System.IO.Tests.Perf_Path.GetFileName

ETL Files

Histogram

Description of detection logic

JIT Disasms

System.IO.Tests.Perf_Path.GetFileNameWithoutExtension

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in System.Xml.Linq.Perf_XName

Repro

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

Payloads

System.Xml.Linq.Perf_XName.CreateElementWithNamespaceImplicitOperator

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Run Information

Regressions in System.Memory.Span<Int32>

Repro

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

Payloads

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

ETL Files

Histogram

Description of detection logic

JIT Disasms

System.Memory.Span<Int32>.LastIndexOfValue(Size: 4)

ETL Files

Histogram

Description of detection logic

JIT Disasms

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

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Metadata

Metadata

Assignees

Labels

Type

Projects

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Development

Issue actions