[Perf] Linux/x64: 22 Improvements on 3/21/2023 4:52:34 PM

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 18.04
Queue | TigerUbuntu
Baseline | [8c5cf110b4d2fa0b98cad4b60e4abba5a6562c58](https://github.com/dotnet/runtime/commit/8c5cf110b4d2fa0b98cad4b60e4abba5a6562c58)
Compare | [7b82cdf019aff3227d882a15c12eeb3c189bb22d](https://github.com/dotnet/runtime/commit/7b82cdf019aff3227d882a15c12eeb3c189bb22d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8c5cf110b4d2fa0b98cad4b60e4abba5a6562c58...7b82cdf019aff3227d882a15c12eeb3c189bb22d)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Improvements in System.Memory.Span&lt;Byte&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[ToArray - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Memory.Span(Byte).ToArray(Size%3a%204).html>) | 86.39 ns | 79.64 ns | 0.92 | 0.16 | False | | |
[ToArray - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Memory.Span(Byte).ToArray(Size%3a%2033).html>) | 93.40 ns | 85.94 ns | 0.92 | 0.11 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Memory.Span(Byte)_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Memory.Span(Byte).html>)

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-a3e7f42f-f9f9-4c95-90e9-a0186a8fc23d12f5553bee543858c/cf6f9de3-d54d-47cf-b203-fdb680a0056b.zip?sv=2021-08-06&se=2023-04-20T10%3A42%3A52Z&sr=c&sp=rl&sig=DiTV2w7wtZet7pZlNT%2FSo7b%2FdjikRyzyyK2Bk%2Fn6UHw%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-b136e36a-f5a7-413e-97ca-ad4e0e1e8a6c0c8ae2493d84d058c/a56d3ebc-1018-4319-ba64-3355a0fce6fa.zip?sv=2021-08-06&se=2023-04-20T21%3A04%3A53Z&sr=c&sp=rl&sig=SzgnC2YQ3wVP4S67%2FP2XzfvaVzAGGF6Ca2EtEUSuleI%3D>)

<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-a3e7f42f-f9f9-4c95-90e9-a0186a8fc23d12f5553bee543858c/cf6f9de3-d54d-47cf-b203-fdb680a0056b.zip?sv=2021-08-06&se=2023-04-20T10%3A42%3A52Z&sr=c&sp=rl&sig=DiTV2w7wtZet7pZlNT%2FSo7b%2FdjikRyzyyK2Bk%2Fn6UHw%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-b136e36a-f5a7-413e-97ca-ad4e0e1e8a6c0c8ae2493d84d058c/a56d3ebc-1018-4319-ba64-3355a0fce6fa.zip?sv=2021-08-06&se=2023-04-20T21%3A04%3A53Z&sr=c&sp=rl&sig=SzgnC2YQ3wVP4S67%2FP2XzfvaVzAGGF6Ca2EtEUSuleI%3D>)
### Histogram

#### System.Memory.Span&lt;Byte&gt;.ToArray(Size: 4)

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 79.63540837268684 < 83.23548582145773.
IsChangePoint: Marked as a change because one of 2/6/2023 6:07:54 PM, 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 27.344942915312316 (T) = (0 -81.11803828592747) / Math.Sqrt((9.83308772259105 / (299)) + (2.117483245732087 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.09052363407624792 = (89.19202447172572 - 81.11803828592747) / 89.19202447172572 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Memory.Span&lt;Byte&gt;.ToArray(Size: 33)

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 85.94212743009594 < 90.76897139440236.
IsChangePoint: Marked as a change because one of 1/27/2023 3:53:39 PM, 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 15.050407232370599 (T) = (0 -88.06956383886245) / Math.Sqrt((6.543394424363484 / (299)) + (6.913067273822993 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.07085761696091941 = (94.78586430510313 - 88.06956383886245) / 94.78586430510313 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```

### 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 18.04
Queue | TigerUbuntu
Baseline | [8c5cf110b4d2fa0b98cad4b60e4abba5a6562c58](https://github.com/dotnet/runtime/commit/8c5cf110b4d2fa0b98cad4b60e4abba5a6562c58)
Compare | [7b82cdf019aff3227d882a15c12eeb3c189bb22d](https://github.com/dotnet/runtime/commit/7b82cdf019aff3227d882a15c12eeb3c189bb22d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8c5cf110b4d2fa0b98cad4b60e4abba5a6562c58...7b82cdf019aff3227d882a15c12eeb3c189bb22d)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Improvements in System.Tests.Perf_String

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL
-- | -- | -- | -- | -- | -- | -- | -- | -- | -- | --
[Remove_IntInt - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.Remove_IntInt(s%3a%20%22dzsdzsDDZSDZSDZSddsz%22%2c%20i1%3a%200%2c%20i2%3a%208).html>) | 121.90 ns | 112.65 ns | 0.92 | 0.12 | False | | |
[Remove_IntInt - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.Remove_IntInt(s%3a%20%22dzsdzsDDZSDZSDZSddsz%22%2c%20i1%3a%207%2c%20i2%3a%204).html>) | 123.32 ns | 109.37 ns | 0.89 | 0.18 | False | | |
[Insert - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.Insert(s1%3a%20%22dzsdzsDDZSDZSDZSddsz%22%2c%20i%3a%207%2c%20s2%3a%20%22Test%22).html>) | 165.58 ns | 130.22 ns | 0.79 | 0.14 | True | | |
[Join_Array - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.Join_Array.html>) | 869.41 ns | 713.32 ns | 0.82 | 0.07 | True | | |
[Join_List - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.Join_List.html>) | 904.69 ns | 828.83 ns | 0.92 | 0.07 | False | | |
[Concat_str_str_str_str - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.Concat_str_str_str_str(size%3a%20100).html>) | 473.97 ns | 440.67 ns | 0.93 | 0.04 | False | | |
[Substring_IntInt - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.Substring_IntInt(s%3a%20%22dzsdzsDDZSDZSDZSddsz%22%2c%20i1%3a%200%2c%20i2%3a%208).html>) | 92.34 ns | 83.21 ns | 0.90 | 0.13 | False | | |
[GetChars - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.GetChars(size%3a%20100).html>) | 125.15 ns | 115.58 ns | 0.92 | 0.09 | False | | |
[TrimStart_CharArr - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.TrimStart_CharArr(s%3a%20%22%20Test%22%2c%20c%3a%20%5b%27%20%27%2c%20%27%e2%80%85%27%5d).html>) | 166.75 ns | 147.43 ns | 0.88 | 0.15 | False | | |
[Substring_Int - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.Substring_Int(s%3a%20%22dzsdzsDDZSDZSDZSddsz%22%2c%20i%3a%207).html>) | 96.19 ns | 82.55 ns | 0.86 | 0.10 | False | | |
[Substring_IntInt - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.Substring_IntInt(s%3a%20%22dzsdzsDDZSDZSDZSddsz%22%2c%20i1%3a%2010%2c%20i2%3a%201).html>) | 100.81 ns | 91.93 ns | 0.91 | 0.09 | False | | |
[Substring_IntInt - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.Substring_IntInt(s%3a%20%22dzsdzsDDZSDZSDZSddsz%22%2c%20i1%3a%207%2c%20i2%3a%204).html>) | 92.11 ns | 84.05 ns | 0.91 | 0.12 | False | | |
[Insert - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.Insert(s1%3a%20%22Test%22%2c%20i%3a%202%2c%20s2%3a%20%22%20Test%22).html>) | 171.55 ns | 135.72 ns | 0.79 | 0.14 | True | | |
[Remove_Int - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 18.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Tests.Perf_String.Remove_Int(s%3a%20%22dzsdzsDDZSDZSDZSddsz%22%2c%20i%3a%207).html>) | 108.56 ns | 97.57 ns | 0.90 | 0.08 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String_1.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/03_28_2023/refs/heads/main_x64_ubuntu%2018.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono_Improvement/System.Tests.Perf_String.html>)

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-a3e7f42f-f9f9-4c95-90e9-a0186a8fc23d12f5553bee543858c/cf6f9de3-d54d-47cf-b203-fdb680a0056b.zip?sv=2021-08-06&se=2023-04-20T10%3A42%3A52Z&sr=c&sp=rl&sig=DiTV2w7wtZet7pZlNT%2FSo7b%2FdjikRyzyyK2Bk%2Fn6UHw%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-b136e36a-f5a7-413e-97ca-ad4e0e1e8a6c0c8ae2493d84d058c/a56d3ebc-1018-4319-ba64-3355a0fce6fa.zip?sv=2021-08-06&se=2023-04-20T21%3A04%3A53Z&sr=c&sp=rl&sig=SzgnC2YQ3wVP4S67%2FP2XzfvaVzAGGF6Ca2EtEUSuleI%3D>)

<details>
   <summary>Repro Steps</summary>


#### Prerequisites (Build files either built locally or downloaded from payload above)
- Libraries build extracted to `runtime/artifacts` or build instructions: [Libraries README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/libraries/README.md) args: `-subset libs+libs.tests -rc release -configuration Release -arch $RunArch -framework net8.0`
- CoreCLR product build extracted to `runtime/artifacts/bin/coreclr/$RunOS.$RunArch.Release`, build instructions: [CoreCLR README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/coreclr/README.md) args: `-subset clr+libs -rc release -configuration Release -arch $RunArch -framework net8.0`
- Mono Runtime build extracted to `runtime/artifacts/bin/mono/$RunOS.$RunArch.Release`, build instructions: [MONO README](https://github.com/dotnet/runtime/blob/main/docs/workflow/building/mono/README.md) args: `-arch $RunArch -os $RunOS -s mono+libs+host+packs -c Release`
- Dotnet SDK installed for dotnet commands
- Running commands from the runtime folder

Linux
```cmd
# Set $RunDir to the runtime directory
RunDir=`pwd`

# Set the OS, arch, and OSId
RunOS='linux'
RunOSId='linux'
RunArch='x64'

# Create mono dotnet
mkdir -p $RunDir/artifacts/dotnet-mono
$RunDir/build.sh -subset libs.pretest -configuration release -ci -arch $RunArch -testscope innerloop /p:RuntimeArtifactsPath=$RunDir/artifacts/bin/mono/$RunOS.$RunArch.Release /p:RuntimeFlavor=mono
cp $RunDir/artifacts/bin/runtime/net8.0-$RunOS-Release-$RunArch/* $RunDir/artifacts/bin/testhost/net8.0-$RunOS-Release-$RunArch/shared/Microsoft.NETCore.App/8.0.0 -rf
cp $RunDir/artifacts/bin/testhost/net8.0-$RunOS-Release-$RunArch/* $RunDir/artifacts/dotnet-mono -r
cp $RunDir/artifacts/bin/coreclr/$RunOS.$RunArch.Release/corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun

# Create Core Root
$RunDir/src/tests/build.sh release $RunArch generatelayoutonly /p:LibrariesConfiguration=Release

# Clone performance 
git clone --branch main --depth 1 --quiet https://github.com/dotnet/performance.git $RunDir/performance

# Use Interpreter
export MONO_ENV_OPTIONS="--interpreter"

# One line run:
python3 $RunDir/performance/scripts/benchmarks_ci.py --csproj $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --incremental no --architecture $RunArch -f net8.0 --filter 'System.Tests.Perf_String*' --bdn-artifacts $RunDir/artifacts/BenchmarkDotNet.Artifacts --bdn-arguments="--anyCategories Libraries Runtime  --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun" 

# Individual Commands:
# Restore 
dotnet restore $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --packages $RunDir/performance/artifacts/packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Build
dotnet build $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore /p:NuGetPackageRoot=$RunDir/performance/artifacts/packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Run
dotnet run --project $RunDir/performance/src/benchmarks/micro/MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore --no-build -- --filter 'System.Tests.Perf_String*' --anyCategories Libraries Runtime " --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir/artifacts/dotnet-mono/shared/Microsoft.NETCore.App/8.0.0/corerun --artifacts $RunDir/artifacts/BenchmarkDotNet.Artifacts --packages $RunDir/performance/artifacts/packages
```

Windows
```cmd
# Set $RunDir to the runtime directory
$RunDir="FullPathHere"

# Set the OS, arch, and OSId
RunOS='windows'
RunOSId='win'
RunArch='x64'

# Create mono dotnet
mkdir -p $RunDir/artifacts/dotnet-mono
$RunDir/build.sh -subset libs.pretest -configuration release -ci -arch $RunArch -testscope innerloop /p:RuntimeArtifactsPath=$RunDir\artifacts\bin\mono\$RunOS.$RunArch.Release /p:RuntimeFlavor=mono
xcopy $RunDir\artifacts\bin\runtime\net8.0-$RunOS-Release-$RunArch\ $RunDir\artifacts\bin\testhost\net8.0-$RunOS-Release-$RunArch\shared\Microsoft.NETCore.App\8.0.0\ /e /y
xcopy $RunDir\artifacts\bin\testhost\net8.0-$RunOS-Release-$RunArch\ $RunDir\artifacts\dotnet-mono\ /e /y
xcopy $RunDir\artifacts\bin\coreclr\$RunOS.$RunArch.Release\corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun /y

# Create Core Root
$RunDir\src\tests\build.cmd release $RunArch generatelayoutonly /p:LibrariesConfiguration=Release

# Clone performance 
git clone --branch main --depth 1 --quiet https://github.com/dotnet/performance.git $RunDir\performance

# Use Interpreter
export MONO_ENV_OPTIONS="--interpreter"

# One line run:
python3 $RunDir\performance\scripts\benchmarks_ci.py --csproj $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --incremental no --architecture $RunArch -f net8.0 --filter 'System.Tests.Perf_String*' --bdn-artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --bdn-arguments="--anyCategories Libraries Runtime  --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun.exe" 

# Individual Commands:
# Restore 
dotnet restore $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --packages $RunDir\performance\artifacts\packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Build
dotnet build $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore /p:NuGetPackageRoot=$RunDir\performance\artifacts\packages /p:UseSharedCompilation=false /p:BuildInParallel=false /m:1

# Run
dotnet run --project $RunDir\performance\src\benchmarks\micro\MicroBenchmarks.csproj --configuration Release --framework net8.0 --no-restore --no-build -- --filter 'System.Tests.Perf_String*' --anyCategories Libraries Runtime " --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun.exe --artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --packages $RunDir\performance\artifacts\packages
```

</details>

<details>

### Payloads

[Baseline](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-a3e7f42f-f9f9-4c95-90e9-a0186a8fc23d12f5553bee543858c/cf6f9de3-d54d-47cf-b203-fdb680a0056b.zip?sv=2021-08-06&se=2023-04-20T10%3A42%3A52Z&sr=c&sp=rl&sig=DiTV2w7wtZet7pZlNT%2FSo7b%2FdjikRyzyyK2Bk%2Fn6UHw%3D>)
[Compare](<https://helixdi107v0xdeko0k025g8.blob.core.windows.net/helix-job-b136e36a-f5a7-413e-97ca-ad4e0e1e8a6c0c8ae2493d84d058c/a56d3ebc-1018-4319-ba64-3355a0fce6fa.zip?sv=2021-08-06&se=2023-04-20T21%3A04%3A53Z&sr=c&sp=rl&sig=SzgnC2YQ3wVP4S67%2FP2XzfvaVzAGGF6Ca2EtEUSuleI%3D>)
### Histogram

#### System.Tests.Perf_String.Remove_IntInt(s: "dzsdzsDDZSDZSDZSddsz", i1: 0, i2: 8)

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 112.64652883643473 < 117.18116423186719.
IsChangePoint: Marked as a change because one of 3/16/2023 9:46:36 PM, 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 76.94758755642222 (T) = (0 -111.63011778970314) / Math.Sqrt((31.490693779939654 / (299)) + (1.1302720914626398 / (38))) is greater than 1.967070609662329 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (38) - 2, .975) and 0.20212438049471332 = (139.90917263384745 - 111.63011778970314) / 139.90917263384745 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.Remove_IntInt(s: "dzsdzsDDZSDZSDZSddsz", i1: 7, i2: 4)

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 109.36992911361848 < 119.22033614339789.
IsChangePoint: Marked as a change because one of 3/16/2023 9:46:36 PM, 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 48.42583786474686 (T) = (0 -112.35989059636388) / Math.Sqrt((38.72597310019643 / (299)) + (9.667924038579743 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.20934467561534223 = (142.10982602793456 - 112.35989059636388) / 142.10982602793456 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.Insert(s1: "dzsdzsDDZSDZSDZSddsz", i: 7, s2: "Test")

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 130.2228122082001 < 156.90673318481677.
IsChangePoint: Marked as a change because one of 2/10/2023 11:47:22 AM, 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 58.14932916509284 (T) = (0 -133.61159207659213) / Math.Sqrt((31.414424400396047 / (299)) + (17.2040968957118 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.2433662708777424 = (176.586883367716 - 133.61159207659213) / 176.586883367716 is greater than 0.05.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```#### System.Tests.Perf_String.Join_Array

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 713.3189878582026 < 799.6034000589287.
IsChangePoint: Marked as a change because one of 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 44.330522018788294 (T) = (0 -726.1858980506381) / Math.Sqrt((414.13771805094694 / (299)) + (254.62049293747097 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.1465615228582612 = (850.8942560015763 - 726.1858980506381) / 850.8942560015763 is greater than 0.05.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```#### System.Tests.Perf_String.Join_List

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 828.8279751788907 < 853.3300253692461.
IsChangePoint: Marked as a change because one of 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 25.785621916484484 (T) = (0 -782.9980553889037) / Math.Sqrt((424.1064729510099 / (299)) + (656.1516500263571 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.123312648477001 = (893.1326019802426 - 782.9980553889037) / 893.1326019802426 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.Concat_str_str_str_str(size: 100)

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 440.67416681498617 < 452.6833995793008.
IsChangePoint: Marked as a change because one of 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 15.82916480449482 (T) = (0 -447.257483926475) / Math.Sqrt((83.58919185208077 / (299)) + (148.5829940819434 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.06678959985927858 = (479.26757337791327 - 447.257483926475) / 479.26757337791327 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.Substring_IntInt(s: "dzsdzsDDZSDZSDZSddsz", i1: 0, i2: 8)

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 83.21073431730177 < 89.96167659256858.
IsChangePoint: Marked as a change because one of 1/27/2023 11:36:27 AM, 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 20.500822088285393 (T) = (0 -85.61346141580444) / Math.Sqrt((7.367785667934834 / (299)) + (6.7463582015029315 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.09620948806161685 = (94.72710798013027 - 85.61346141580444) / 94.72710798013027 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.GetChars(size: 100)

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 115.58438310544464 < 118.33063588336606.
IsChangePoint: Marked as a change because one of 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 22.421327443184833 (T) = (0 -113.27229702906773) / Math.Sqrt((7.978976367185842 / (299)) + (3.9524843786622865 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.06614188621445019 = (121.29497549675888 - 113.27229702906773) / 121.29497549675888 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.TrimStart_CharArr(s: " Test", c: [' ', ' '])

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 147.43034932082608 < 149.09756584150895.
IsChangePoint: Marked as a change because one of 2/6/2023 11:23:26 AM, 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 9.555877232321794 (T) = (0 -150.3134595898578) / Math.Sqrt((16.394487884808857 / (299)) + (27.084165678050358 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.05215966920500105 = (158.58521177694848 - 150.3134595898578) / 158.58521177694848 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.Substring_Int(s: "dzsdzsDDZSDZSDZSddsz", i: 7)

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 82.55336368115597 < 88.55856778540316.
IsChangePoint: Marked as a change because one of 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 31.716948664859064 (T) = (0 -84.66551367679708) / Math.Sqrt((5.596025874876032 / (299)) + (2.9783775745240826 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.10355333342520964 = (94.44567851458841 - 84.66551367679708) / 94.44567851458841 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.Substring_IntInt(s: "dzsdzsDDZSDZSDZSddsz", i1: 10, i2: 1)

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 91.93411394195775 < 95.36936453113924.
IsChangePoint: Marked as a change because one of 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 26.409636465819805 (T) = (0 -92.95053109108991) / Math.Sqrt((7.820958320955878 / (299)) + (3.3969777246214714 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.08727446485669646 = (101.83842514770457 - 92.95053109108991) / 101.83842514770457 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.Substring_IntInt(s: "dzsdzsDDZSDZSDZSddsz", i1: 7, i2: 4)

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 84.05342164202729 < 88.32502985879222.
IsChangePoint: Marked as a change because one of 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 34.97009036618064 (T) = (0 -84.76182547349472) / Math.Sqrt((9.624592947046866 / (299)) + (1.6950547903748856 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.10191217979646784 = (94.3803307056155 - 84.76182547349472) / 94.3803307056155 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Tests.Perf_String.Insert(s1: "Test", i: 2, s2: " Test")

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 135.71825664341148 < 161.41120444773063.
IsChangePoint: Marked as a change because one of 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 56.93195941340913 (T) = (0 -134.73570611202734) / Math.Sqrt((33.263601698484244 / (299)) + (21.929894272559057 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.2574907635423586 = (181.45997315107303 - 134.73570611202734) / 181.45997315107303 is greater than 0.05.
IsChangeEdgeDetector: Marked as regression because Edge Detector said so.

```#### System.Tests.Perf_String.Remove_Int(s: "dzsdzsDDZSDZSDZSddsz", i: 7)

```log

```
### Description of detection logic
```IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 97.57352707006368 < 101.67663176620673.
IsChangePoint: Marked as a change because one of 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 25.933201462331954 (T) = (0 -98.19460124404738) / Math.Sqrt((7.349172344572044 / (299)) + (3.5446408376155993 / (39))) is greater than 1.9670493839589689 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (39) - 2, .975) and 0.08235203215478562 = (107.00683125210222 - 98.19460124404738) / 107.00683125210222 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```

### 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 18.04
Queue	TigerUbuntu
Baseline	8c5cf110b4d2fa0b98cad4b60e4abba5a6562c58
Compare	7b82cdf019aff3227d882a15c12eeb3c189bb22d
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	Baseline ETL	Compare ETL
ToArray - Duration of single invocation	86.39 ns	79.64 ns	0.92	0.16	False
ToArray - Duration of single invocation	93.40 ns	85.94 ns	0.92	0.11	False

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector
Remove_IntInt - Duration of single invocation	121.90 ns	112.65 ns	0.92	0.12	False
Remove_IntInt - Duration of single invocation	123.32 ns	109.37 ns	0.89	0.18	False
Insert - Duration of single invocation	165.58 ns	130.22 ns	0.79	0.14	True
Join_Array - Duration of single invocation	869.41 ns	713.32 ns	0.82	0.07	True
Join_List - Duration of single invocation	904.69 ns	828.83 ns	0.92	0.07	False
Concat_str_str_str_str - Duration of single invocation	473.97 ns	440.67 ns	0.93	0.04	False
Substring_IntInt - Duration of single invocation	92.34 ns	83.21 ns	0.90	0.13	False
GetChars - Duration of single invocation	125.15 ns	115.58 ns	0.92	0.09	False
TrimStart_CharArr - Duration of single invocation	166.75 ns	147.43 ns	0.88	0.15	False
Substring_Int - Duration of single invocation	96.19 ns	82.55 ns	0.86	0.10	False
Substring_IntInt - Duration of single invocation	100.81 ns	91.93 ns	0.91	0.09	False
Substring_IntInt - Duration of single invocation	92.11 ns	84.05 ns	0.91	0.12	False
Insert - Duration of single invocation	171.55 ns	135.72 ns	0.79	0.14	True
Remove_Int - Duration of single invocation	108.56 ns	97.57 ns	0.90	0.08	False

[Perf] Linux/x64: 22 Improvements on 3/21/2023 4:52:34 PM #14531

Description

Run Information

Improvements in System.Memory.Span<Byte>

Repro

Payloads

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

Payloads

Histogram

System.Memory.Span<Byte>.ToArray(Size: 4)

Description of detection logic

Description of detection logic

Docs

Run Information

Improvements in System.Tests.Perf_String

Repro

Payloads

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

Payloads

Histogram

System.Tests.Perf_String.Remove_IntInt(s: "dzsdzsDDZSDZSDZSddsz", i1: 0, i2: 8)

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Description of detection logic

Docs

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions