dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 23 Regressions on 5/7/2026 3:57:15 PM +00:00

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arch-x64 branch-refs/heads/main compilationmode-tiered kind-micro_mono llvm-false mono-interpreter monoaot-false monointerpreter-true os-linux perf-regression runkind-micro_mono runtime-mono untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [cdbf0c2ba8a84fdc9d83f019baa2103a0afd580b](https://github.com/dotnet/runtime/commit/cdbf0c2ba8a84fdc9d83f019baa2103a0afd580b)
Compare | [c3caf4d3163c429efbdefe7756a71702e9e6c982](https://github.com/dotnet/runtime/commit/c3caf4d3163c429efbdefe7756a71702e9e6c982)
Diff | [Diff](https://github.com/dotnet/runtime/compare/cdbf0c2ba8a84fdc9d83f019baa2103a0afd580b...c3caf4d3163c429efbdefe7756a71702e9e6c982)
Configs | CompilationMode:tiered, LLVM:false, MonoAOT:false, MonoInterpreter:true, RunKind:micro_mono

### Regressions in System.Collections.Tests.Perf_BitArray

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [BitArrayBoolArrayCtor - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 770.02 ns | 1557.66 ns | 2.02 | 0.06 | False | | |
|
  • [BitArrayGet - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 115.63 ฮผs | 146.01 ฮผs | 1.26 | 0.27 | False | | |
|
  • [BitArraySet - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 18.32 ฮผs | 22.17 ฮผs | 1.21 | 0.20 | False | | |
|
  • [BitArraySet - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 162.59 ns | 191.02 ns | 1.17 | 0.13 | False | | |
|
  • [BitArrayGet - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 915.02 ns | 1073.74 ns | 1.17 | 0.27 | False | | |
|
  • [BitArraySetAll - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 80.29 ns | 93.33 ns | 1.16 | 0.08 | False | | |
|
  • [BitArrayLeftShift - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 138.74 ns | 161.15 ns | 1.16 | 0.07 | False | | |
|
  • [BitArrayOr - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 705.22 ns | 807.69 ns | 1.15 | 0.27 | False | | |
|
  • [BitArrayRightShift - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 130.79 ns | 148.45 ns | 1.14 | 0.06 | False | | |
|
  • [BitArrayAnd - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 702.71 ns | 794.26 ns | 1.13 | 0.27 | False | | |
|
  • [BitArrayXor - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 156.14 ns | 174.96 ns | 1.12 | 0.06 | False | | |
|
  • [BitArrayAnd - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 157.42 ns | 175.85 ns | 1.12 | 0.04 | False | | |
|
  • [BitArrayOr - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 157.41 ns | 175.78 ns | 1.12 | 0.06 | False | | |
|
  • [BitArrayNot - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 191.77 ns | 212.78 ns | 1.11 | 0.03 | False | | |
|
  • [BitArrayCopyToIntArray - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 208.69 ns | 230.67 ns | 1.11 | 0.08 | False | | |
|
  • [BitArrayCopyToIntArray - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 140.64 ns | 155.36 ns | 1.10 | 0.10 | False | | |
|
  • [BitArrayLengthValueCtor - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 136.37 ns | 150.59 ns | 1.10 | 0.07 | False | | |
|
  • [BitArrayXor - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 721.27 ns | 795.07 ns | 1.10 | 0.28 | False | | |
|
  • [BitArrayLengthValueCtor - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 108.75 ns | 119.72 ns | 1.10 | 0.11 | False | | |
|
  • [BitArrayCopyToByteArray - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 227.72 ns | 245.64 ns | 1.08 | 0.05 | False | | |
|
  • [BitArrayIntArrayCtor - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 118.08 ns | 127.11 ns | 1.08 | 0.09 | False | | |
|
  • [BitArrayBoolArrayCtor - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 138.49 ns | 148.76 ns | 1.07 | 0.10 | False | | |
|
  • [BitArrayCopyToByteArray - Duration of single invocation]()
  • ๐Ÿ“ - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 142.34 ns | 152.17 ns | 1.07 | 0.10 | False | | |

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[Test Report]()

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

Repro Steps

#### 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.Tests.Perf_BitArray*' --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.Tests.Perf_BitArray*' --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.Tests.Perf_BitArray*' --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.Tests.Perf_BitArray*' --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
```

### System.Collections.Tests.Perf_BitArray.BitArrayBoolArrayCtor(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayGet(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArraySet(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArraySet(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayGet(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArraySetAll(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayLeftShift(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayOr(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayRightShift(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayAnd(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayXor(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayAnd(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayOr(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayNot(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayCopyToIntArray(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayCopyToIntArray(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayLengthValueCtor(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayXor(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayLengthValueCtor(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayCopyToByteArray(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayIntArrayCtor(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayBoolArrayCtor(Size: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_BitArray.BitArrayCopyToByteArray(Size: 4)

#### 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)

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