[Perf] Linux/arm64: 13 Regressions on 10/4/2023 1:30:06 AM

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [215145e95981ee4917ff3432acc44114f835126c](https://github.com/dotnet/runtime/commit/215145e95981ee4917ff3432acc44114f835126c)
Compare | [dc203909b6ef6f078e939e0ec3587d0eafa40273](https://github.com/dotnet/runtime/commit/dc203909b6ef6f078e939e0ec3587d0eafa40273)
Diff | [Diff](https://github.com/dotnet/runtime/compare/215145e95981ee4917ff3432acc44114f835126c...dc203909b6ef6f078e939e0ec3587d0eafa40273)
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_arm64_ubuntu 20.04_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> | 1.45 μs | 1.55 μs | 1.07 | 0.01 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_arm64_ubuntu%2020.04_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_arm64_ubuntu%2020.04_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-9a695469-755d-4e87-ab9b-b4ff582fe21dbb48b013f954c7b84/89422820-73d9-4ec1-9282-e0ac60284d5f.zip?sv=2021-08-06&se=2023-11-01T03%3A05%3A39Z&sr=c&sp=rl&sig=3LbaP9AFJSMPMJnflFPLb17sc8SudzzuJEd%2FyPq4v%2Fg%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-45235110-c3b5-4db2-a81b-cbba0170b98ad0b600d59754c23a5/e5123f65-4706-46f0-8203-968381b017ee.zip?sv=2021-08-06&se=2023-11-04T03%3A16%3A25Z&sr=c&sp=rl&sig=mnBmzV9C9jTheADjA3i3I0xoT%2Bvx6Wi7O%2F2QeO8IDbk%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 we could not find enough baseline builds for window checking.
IsChangePoint: Marked as a change because one of 1/3/2023 12:19:11 AM, 2/28/2023 12:47:31 AM, 3/16/2023 1:27:09 AM, 10/2/2023 10:24:51 PM, 10/8/2023 11:25:37 PM falls between 9/30/2023 12:13:33 AM and 10/8/2023 11:25:37 PM.
IsRegressionStdDev: Marked as regression because -11.804269140896938 (T) = (0 -1535.4645131906018) / Math.Sqrt((148.00112210846322 / (6)) + (198.8690505116161 / (4))) is less than -2.3060041352041716 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (4) - 2, .025) and -0.07101235299195607 = (1433.6571458780681 - 1535.4645131906018) / 1433.6571458780681 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 | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [215145e95981ee4917ff3432acc44114f835126c](https://github.com/dotnet/runtime/commit/215145e95981ee4917ff3432acc44114f835126c)
Compare | [dc203909b6ef6f078e939e0ec3587d0eafa40273](https://github.com/dotnet/runtime/commit/dc203909b6ef6f078e939e0ec3587d0eafa40273)
Diff | [Diff](https://github.com/dotnet/runtime/compare/215145e95981ee4917ff3432acc44114f835126c...dc203909b6ef6f078e939e0ec3587d0eafa40273)
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_arm64_ubuntu 20.04_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> | 110.52 ns | 676.93 ns | 6.12 | 0.26 | True | | |
|<ul><li>[LastIndexOfValue - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04_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=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>)</li></ul> | 490.51 ns | 4.31 μs | 8.78 | 0.30 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_arm64_ubuntu%2020.04_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_arm64_ubuntu%2020.04_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_arm64_ubuntu%2020.04_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-9a695469-755d-4e87-ab9b-b4ff582fe21dbb48b013f954c7b84/89422820-73d9-4ec1-9282-e0ac60284d5f.zip?sv=2021-08-06&se=2023-11-01T03%3A05%3A39Z&sr=c&sp=rl&sig=3LbaP9AFJSMPMJnflFPLb17sc8SudzzuJEd%2FyPq4v%2Fg%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-45235110-c3b5-4db2-a81b-cbba0170b98ad0b600d59754c23a5/e5123f65-4706-46f0-8203-968381b017ee.zip?sv=2021-08-06&se=2023-11-04T03%3A16%3A25Z&sr=c&sp=rl&sig=mnBmzV9C9jTheADjA3i3I0xoT%2Bvx6Wi7O%2F2QeO8IDbk%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 we could not find enough baseline builds for window checking.
IsChangePoint: Marked as a change because one of 10/2/2023 10:24:51 PM, 10/8/2023 11:25:37 PM falls between 9/30/2023 12:13:33 AM and 10/8/2023 11:25:37 PM.
IsRegressionStdDev: Marked as regression because -130.62407012902273 (T) = (0 -684.1689973039842) / Math.Sqrt((8.496163284978987 / (6)) + (70.91034687973672 / (4))) is less than -2.3060041352041716 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (4) - 2, .025) and -5.073723942658106 = (112.64407203277737 - 684.1689973039842) / 112.64407203277737 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 we could not find enough baseline builds for window checking.
IsChangePoint: Marked as a change because one of 2/28/2023 12:47:31 AM, 10/2/2023 10:24:51 PM, 10/8/2023 11:25:37 PM falls between 9/30/2023 12:13:33 AM and 10/8/2023 11:25:37 PM.
IsRegressionStdDev: Marked as regression because -36.45439664240854 (T) = (0 -4444.54169605975) / Math.Sqrt((812.302256749653 / (6)) + (47652.046336653206 / (4))) is less than -2.3060041352041716 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (4) - 2, .025) and -9.030149397324415 = (443.11819495384094 - 4444.54169605975) / 443.11819495384094 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 | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [215145e95981ee4917ff3432acc44114f835126c](https://github.com/dotnet/runtime/commit/215145e95981ee4917ff3432acc44114f835126c)
Compare | [dc203909b6ef6f078e939e0ec3587d0eafa40273](https://github.com/dotnet/runtime/commit/dc203909b6ef6f078e939e0ec3587d0eafa40273)
Diff | [Diff](https://github.com/dotnet/runtime/compare/215145e95981ee4917ff3432acc44114f835126c...dc203909b6ef6f078e939e0ec3587d0eafa40273)
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_arm64_ubuntu 20.04_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> | 188.06 ns | 667.25 ns | 3.55 | 0.37 | False | | |
|<ul><li>[LastIndexOfValue - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04_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=H4sIAAAAAAAACpVU72+bMBD9Hmn/g78BG6FA+mvZqJR2H1otWbeSdR+qqnLhkrjDNjqbJZmm/e07SNqGdO00ISF8fu/53t3hAixLZxrtJy7BsITl3NJzW4B7UakvFVTQNxaFmvqsWdW4dcRjVx3nm1C5npsgCoOBzPd3gzg8jYPzeRF8Bpw4PnPmQnUX+7tdLnPH/wshensaBWMxBXxCEcpCUZO+3lbKVqQd7gYDlMS6hxYE5XWE9EtA2ETHNbo5oy1fPCMfHT5PiA7blE0bDwkFafVoYJWVoQjPYJOSAv4g8baP+baPzvW7zgg48UGCsqbzi81ntMGOK1HkF1BqliTMybVVYHeQDAhJrBbqGLnKZg0OYWJ2ZsBzsyO5UFvAAWYzYSGzdFoDJ68O0/jMbpPoo8QYTDM/zV66NBZkMAKpcRmkJVfvz5TtxUfBkBt7pnJYnE8ueVGBm4qf0Gd7Uew9atHUnWg1EdMKuRVamSvnRMtSFM1qpHNwrlnymzlWEDx3Xr3EHA4vR2v4hBcGXkaPtNKD8/H/EcgbYIlA7/vEsPoHj0IfaRbWeCky1DeStNoVPdHUU8CxLtdf7ZaNqd2ppWFhR/VPC3X73TiMe93woBuF4/CwH4f9sBf09qKDvTh6E9Iq9EjEVFJypNozjtMbyRduI1h30GevPXa73DrBf+iwX9tp7gHSKVHf0VA8AV+AqQqbIGWduxtOVvEBzT6fklLPa6ndaaHYdypLIpQC3LyVtNoEItAMIav9ZjOOls2FnTHXAAowycMl5bNFpotKqmQ7v+UqbpJVQgS0whaQOB+ojPQvLtfLmsJcZbw6ZspC2IQvwHh/ALP7xPA0BQAA>)</li></ul> | 1.68 μs | 6.98 μs | 4.14 | 0.40 | False | | |
|<ul><li>[LastIndexOfValue - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04_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> | 77.70 ns | 164.49 ns | 2.12 | 0.35 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_arm64_ubuntu%2020.04_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_arm64_ubuntu%2020.04_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_arm64_ubuntu%2020.04_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_arm64_ubuntu%2020.04_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-9a695469-755d-4e87-ab9b-b4ff582fe21dbb48b013f954c7b84/89422820-73d9-4ec1-9282-e0ac60284d5f.zip?sv=2021-08-06&se=2023-11-01T03%3A05%3A39Z&sr=c&sp=rl&sig=3LbaP9AFJSMPMJnflFPLb17sc8SudzzuJEd%2FyPq4v%2Fg%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-45235110-c3b5-4db2-a81b-cbba0170b98ad0b600d59754c23a5/e5123f65-4706-46f0-8203-968381b017ee.zip?sv=2021-08-06&se=2023-11-04T03%3A16%3A25Z&sr=c&sp=rl&sig=mnBmzV9C9jTheADjA3i3I0xoT%2Bvx6Wi7O%2F2QeO8IDbk%3D>)
### 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 we could not find enough baseline builds for window checking.
IsChangePoint: Marked as a change because one of 12/14/2022 12:26:48 AM, 12/17/2022 10:44:50 PM, 2/28/2023 12:47:31 AM, 10/2/2023 10:24:51 PM, 10/8/2023 11:25:37 PM falls between 9/30/2023 12:13:33 AM and 10/8/2023 11:25:37 PM.
IsRegressionStdDev: Marked as regression because -76.73784328888462 (T) = (0 -679.0106544756744) / Math.Sqrt((18.503791395211046 / (6)) + (154.64318396724175 / (4))) is less than -2.3060041352041716 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (4) - 2, .025) and -2.70626819773222 = (183.20602240581115 - 679.0106544756744) / 183.20602240581115 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

### 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 we could not find enough baseline builds for window checking.
IsChangePoint: Marked as a change because one of 12/14/2022 12:26:48 AM, 12/17/2022 10:44:50 PM, 10/2/2023 10:24:51 PM, 10/8/2023 11:25:37 PM falls between 9/30/2023 12:13:33 AM and 10/8/2023 11:25:37 PM.
IsRegressionStdDev: Marked as regression because -15.830883806268238 (T) = (0 -7787.471251500296) / Math.Sqrt((8724.318021133131 / (6)) + (591298.9022682607 / (4))) is less than -2.3060041352041716 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (4) - 2, .025) and -3.6604938130093645 = (1670.954101422095 - 7787.471251500296) / 1670.954101422095 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

### 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 we could not find enough baseline builds for window checking.
IsChangePoint: Marked as a change because one of 12/17/2022 10:44:50 PM, 2/28/2023 12:47:31 AM, 3/14/2023 1:07:29 AM, 10/2/2023 10:24:51 PM, 10/8/2023 11:25:37 PM falls between 9/30/2023 12:13:33 AM and 10/8/2023 11:25:37 PM.
IsRegressionStdDev: Marked as regression because -57.078331995738154 (T) = (0 -164.95534874356227) / Math.Sqrt((7.473185336938679 / (6)) + (4.235950182836025 / (4))) is less than -2.3060041352041716 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (4) - 2, .025) and -1.1065268860346331 = (78.30678537128829 - 164.95534874356227) / 78.30678537128829 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 | arm64
OS | ubuntu 20.04
Queue | AmpereUbuntu
Baseline | [215145e95981ee4917ff3432acc44114f835126c](https://github.com/dotnet/runtime/commit/215145e95981ee4917ff3432acc44114f835126c)
Compare | [dc203909b6ef6f078e939e0ec3587d0eafa40273](https://github.com/dotnet/runtime/commit/dc203909b6ef6f078e939e0ec3587d0eafa40273)
Diff | [Diff](https://github.com/dotnet/runtime/compare/215145e95981ee4917ff3432acc44114f835126c...dc203909b6ef6f078e939e0ec3587d0eafa40273)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in System.Collections.ContainsTrue&lt;Int32&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[Stack - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu 20.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Collections.ContainsTrue(Int32).Stack(Size%3a%20512).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Collections/Contains/ContainsTrue.cs#L164-#L173>)</li><li>[📈 - ADX Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=H4sIAAAAAAAACpVUXU/bQBB8j9T/cG+2W8fYTgghrZECfQCVlJa47QNC6LA38cF9WHfnJqmq/vaunQBxKEiVJcu3NzO3s7s+DpZMC6XtZyrAkITk1OJzy8G9rOTXCioYGauZnPukWdW4TcQjVx3nB5O5WpggCoOxyAf9IA5P4+BiwYMvoGeOT5wFk93loN+lInf8fxCiw9MoSNkc9DMKkxZ4Tfp2W0lboXbYD8ZaIOsByhFK6wjql6BhGx3X6OaMtjx/QT4avkyIhm3Kto3HhIJp9WRgnZXBCM1gmzIF/RPF2z4Wuz461+87E6DIBwHSms5vsihwgxxXjOeXUCqSJMTJlZVg9zQaYAJZLdSxpjIrGpyGmdkrgOZmT1Amd4BjnRXMQmbxtAaOXh2i9Au7TaJPEimYZn6avenKWBDBieIcGUxJg9/S4pkm1RV8OJO2Fx8FU0uze3fKfsGI7Eex96SGc4eEGZtXmjb8K+dEiZLxZjVROTjXJPlDHMsQnjtvXmOen3+fbOAzyg28jp4oqcYX6f8R0BDoUgO+HxJDn6/zMPQJp2GDFyzT6kagVrumJwq7CjpV5ear3bQUG45lFCU5qn9bqAfAjcO41w0PulGYhsNRHI7C/WAY9g76g8N3Ia5CD0VMJQTVWHtC9fxG0KXbCNY99Mlbj9yudk7wH3vs13aamwB1Sq3usMnPwJdgKm4TjVnn7paTdXyM00/nqNTzWmp3iklyj2VJmJSgt+8lJbeBGmSO+7XfrKDakgWzBXENaAYmebymfLLMFK+ETHbzW63jJlknhEDLLIfE+YhlxL9xtVnWFOJK49UxU3JmE7oE4/0FsflW1jYFAAA=>)</li></ul> | 1.09 ms | 4.56 ms | 4.19 | 0.43 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_arm64_ubuntu%2020.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Collections.ContainsTrue%28Int32%29_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/10_10_2023/refs/heads/main_arm64_ubuntu%2020.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Collections.ContainsTrue%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.Collections.ContainsTrue&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.Collections.ContainsTrue&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.Collections.ContainsTrue&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.Collections.ContainsTrue&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-9a695469-755d-4e87-ab9b-b4ff582fe21dbb48b013f954c7b84/89422820-73d9-4ec1-9282-e0ac60284d5f.zip?sv=2021-08-06&se=2023-11-01T03%3A05%3A39Z&sr=c&sp=rl&sig=3LbaP9AFJSMPMJnflFPLb17sc8SudzzuJEd%2FyPq4v%2Fg%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-45235110-c3b5-4db2-a81b-cbba0170b98ad0b600d59754c23a5/e5123f65-4706-46f0-8203-968381b017ee.zip?sv=2021-08-06&se=2023-11-04T03%3A16%3A25Z&sr=c&sp=rl&sig=mnBmzV9C9jTheADjA3i3I0xoT%2Bvx6Wi7O%2F2QeO8IDbk%3D>)
### System.Collections.ContainsTrue&lt;Int32&gt;.Stack(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 we could not find enough baseline builds for window checking.
IsChangePoint: Marked as a change because one of 12/14/2022 12:26:48 AM, 12/17/2022 10:44:50 PM, 10/2/2023 10:24:51 PM, 10/8/2023 11:25:37 PM falls between 9/30/2023 12:13:33 AM and 10/8/2023 11:25:37 PM.
IsRegressionStdDev: Marked as regression because -118.91445265917189 (T) = (0 -4531587.173128255) / Math.Sqrt((1732462227.9474366 / (6)) + (2134059396.0233548 / (4))) is less than -2.3060041352041716 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (6) + (4) - 2, .025) and -3.039894913898704 = (1121709.1705870742 - 4531587.173128255) / 1121709.1705870742 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>

Name	Value
Architecture	arm64
OS	ubuntu 20.04
Queue	AmpereUbuntu
Baseline	215145e95981ee4917ff3432acc44114f835126c
Compare	dc203909b6ef6f078e939e0ec3587d0eafa40273
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	110.52 ns	676.93 ns	6.12	0.26	True
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	490.51 ns	4.31 μs	8.78	0.30	False

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	188.06 ns	667.25 ns	3.55	0.37	False
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	1.68 μs	6.98 μs	4.14	0.40	False
LastIndexOfValue - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	77.70 ns	164.49 ns	2.12	0.35	False

[Perf] Linux/arm64: 13 Regressions on 10/4/2023 1:30:06 AM #22938

Description

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<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.Memory.Span<Int32>

Repro

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

Payloads

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

ETL Files

Histogram

Description of detection logic

JIT Disasms

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

Docs

Run Information

Regressions in System.Collections.ContainsTrue<Int32>

Repro

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

Payloads

System.Collections.ContainsTrue<Int32>.Stack(Size: 512)

ETL Files

Histogram

Description of detection logic

JIT Disasms

Docs

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions