[Perf] Linux/arm64: 4 Regressions on 5/12/2026 11:35:36 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [5001116c5cef4a620fd25d9fe909f38935c5023b](https://github.com/dotnet/runtime/commit/5001116c5cef4a620fd25d9fe909f38935c5023b)
Compare | [ac6d868d93f22d83400bdb8a1b5bc5637f94da1c](https://github.com/dotnet/runtime/commit/ac6d868d93f22d83400bdb8a1b5bc5637f94da1c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/5001116c5cef4a620fd25d9fe909f38935c5023b...ac6d868d93f22d83400bdb8a1b5bc5637f94da1c)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Double&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[IndexOfMax - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu%2022.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives(Double).IndexOfMax(BufferLength%3a%20128).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Numerics.Tensors/Perf_NumberTensorPrimitives.cs#L99-#L100>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 49.66 μs | 63.08 μs | 1.27 | 0.27 | False | | |
|<ul><li>[IndexOfMax - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu%2022.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives(Double).IndexOfMax(BufferLength%3a%203079).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Numerics.Tensors/Perf_NumberTensorPrimitives.cs#L99-#L100>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 1.24 ms | 1.56 ms | 1.26 | 0.17 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/05_19_2026/refs/heads/main_arm64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives%28Double%29_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/05_19_2026/refs/heads/main_arm64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives%28Double%29_002.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/05_19_2026/refs/heads/main_arm64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives%28Double%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.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Double&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.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Double&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.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Double&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.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Double&gt;*' --anyCategories Libraries Runtime " --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun.exe --artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --packages $RunDir\performance\artifacts\packages
```

</details>

<details>

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Double&gt;.IndexOfMax(BufferLength: 128)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Double&gt;.IndexOfMax(BufferLength: 3079)

#### ETL Files

#### Histogram

#### JIT Disasms



### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

</details>


---


### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [5001116c5cef4a620fd25d9fe909f38935c5023b](https://github.com/dotnet/runtime/commit/5001116c5cef4a620fd25d9fe909f38935c5023b)
Compare | [ac6d868d93f22d83400bdb8a1b5bc5637f94da1c](https://github.com/dotnet/runtime/commit/ac6d868d93f22d83400bdb8a1b5bc5637f94da1c)
Diff | [Diff](https://github.com/dotnet/runtime/compare/5001116c5cef4a620fd25d9fe909f38935c5023b...ac6d868d93f22d83400bdb8a1b5bc5637f94da1c)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono


### Regressions in System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Single&gt;

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|<ul><li>[IndexOfMax - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu%2022.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives(Single).IndexOfMax(BufferLength%3a%203079).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Numerics.Tensors/Perf_NumberTensorPrimitives.cs#L99-#L100>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 387.74 μs | 622.84 μs | 1.61 | 0.29 | False | | |
|<ul><li>[IndexOfMax - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_arm64_ubuntu%2022.04_LLVM=false_MonoAOT=false_MonoInterpreter=true_RunKind=micro_mono/System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives(Single).IndexOfMax(BufferLength%3a%20128).html>)</li><li>📝 - [Benchmark Source](<https://github.com/dotnet/performance/blob/main/src/benchmarks/micro/libraries/System.Numerics.Tensors/Perf_NumberTensorPrimitives.cs#L99-#L100>)</li><li>[ADX - Test Multi Config Graph](<https://dataexplorer.azure.com/clusters/dotnetperf.westus/databases/PerformanceData?query=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>)</li></ul> | 17.47 μs | 25.78 μs | 1.48 | 0.29 | False | | |

![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/05_19_2026/refs/heads/main_arm64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives%28Single%29_001.png>)
![graph](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/05_19_2026/refs/heads/main_arm64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives%28Single%29_002.png>)
[Test Report](<https://pvscmdupload.z22.web.core.windows.net/autofilereport/autofilereports/05_19_2026/refs/heads/main_arm64_ubuntu%2022.04_LLVM%3Dfalse_MonoAOT%3Dfalse_MonoInterpreter%3Dtrue_RunKind%3Dmicro_mono_Regression/System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives%28Single%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.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Single&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.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Single&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.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Single&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.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Single&gt;*' --anyCategories Libraries Runtime " --category-exclusion-filter NoInterpreter NoMono --logBuildOutput --generateBinLog --corerun $RunDir\artifacts\dotnet-mono\shared\Microsoft.NETCore.App\8.0.0\corerun.exe --artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --packages $RunDir\performance\artifacts\packages
```

</details>

<details>

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Single&gt;.IndexOfMax(BufferLength: 3079)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives&lt;Single&gt;.IndexOfMax(BufferLength: 128)

#### ETL Files

#### Histogram

#### JIT Disasms



### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

</details>

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[Perf] Linux/arm64: 4 Regressions on 5/12/2026 11:35:36 PM +00:00 #73196

Run Information

Regressions in System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Double>

Repro

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

System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Double>.IndexOfMax(BufferLength: 128)

ETL Files

Histogram

JIT Disasms

System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Double>.IndexOfMax(BufferLength: 3079)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Single>

Repro

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

System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Single>.IndexOfMax(BufferLength: 3079)

ETL Files

Histogram

JIT Disasms

System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Single>.IndexOfMax(BufferLength: 128)

ETL Files

Histogram

JIT Disasms

Docs

Metadata

Assignees

Labels

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Fields

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Development

Name	Value
Architecture	arm64
OS	ubuntu 22.04
Queue	AmpereUbuntu
Baseline	5001116c5cef4a620fd25d9fe909f38935c5023b
Compare	ac6d868d93f22d83400bdb8a1b5bc5637f94da1c
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
IndexOfMax - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	49.66 μs	63.08 μs	1.27	0.27	False
IndexOfMax - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	1.24 ms	1.56 ms	1.26	0.17	False

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
IndexOfMax - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	387.74 μs	622.84 μs	1.61	0.29	False
IndexOfMax - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	17.47 μs	25.78 μs	1.48	0.29	False

[Perf] Linux/arm64: 4 Regressions on 5/12/2026 11:35:36 PM +00:00 #73196

Description

Run Information

Regressions in System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Double>

Repro

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

System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Double>.IndexOfMax(BufferLength: 128)

ETL Files

Histogram

JIT Disasms

System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Double>.IndexOfMax(BufferLength: 3079)

ETL Files

Histogram

JIT Disasms

Docs

Run Information

Regressions in System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Single>

Repro

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

System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Single>.IndexOfMax(BufferLength: 3079)

ETL Files

Histogram

JIT Disasms

System.Numerics.Tensors.Tests.Perf_NumberTensorPrimitives<Single>.IndexOfMax(BufferLength: 128)

ETL Files

Histogram

JIT Disasms

Docs

Metadata

Metadata

Assignees

Labels

Type

Fields

Projects

Milestone

Relationships

Development

Issue actions