[Perf] Linux/x64: 70 Regressions on 4/11/2026 8:23:20 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [1c60926108333917b419fd5489fb6d2070317222](https://github.com/dotnet/runtime/commit/1c60926108333917b419fd5489fb6d2070317222)
Compare | [4fd3283754e18266bcfde2f3279656d655018a81](https://github.com/dotnet/runtime/commit/4fd3283754e18266bcfde2f3279656d655018a81)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1c60926108333917b419fd5489fb6d2070317222...4fd3283754e18266bcfde2f3279656d655018a81)
Configs | CompilationMode:tiered, LLVM:true, MonoAOT:true, MonoInterpreter:false, RunKind:micro_mono

### Regressions in System.Tests.Perf_Int128

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

• [TryParseSpan - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 254.09 ns | 487.28 ns | 1.92 | 0.02 | False | | |
|

• [Parse - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 265.75 ns | 496.37 ns | 1.87 | 0.03 | False | | |
|

• [ParseSpan - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 268.68 ns | 497.02 ns | 1.85 | 0.02 | False | | |
|

• [TryParseSpan - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 254.95 ns | 471.13 ns | 1.85 | 0.02 | False | | |
|

• [TryParse - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 255.09 ns | 470.36 ns | 1.84 | 0.02 | False | | |
|

• [TryParse - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 258.57 ns | 472.83 ns | 1.83 | 0.03 | False | | |
|

• [ParseSpan - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 273.33 ns | 499.52 ns | 1.83 | 0.02 | False | | |
|

• [Parse - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 270.42 ns | 487.31 ns | 1.80 | 0.01 | False | | |
|

• [Parse - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 43.23 ns | 71.18 ns | 1.65 | 0.04 | False | | |
|

• [ParseSpan - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 44.36 ns | 71.32 ns | 1.61 | 0.05 | False | | |
|

• [ToString - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 72.23 ns | 112.71 ns | 1.56 | 0.02 | False | | |
|

• [TryParse - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 39.76 ns | 61.18 ns | 1.54 | 0.02 | False | | |
|

• [TryParseSpan - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 40.53 ns | 62.36 ns | 1.54 | 0.01 | False | | |
|

• [ToString - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 81.98 ns | 117.79 ns | 1.44 | 0.03 | False | | |
|

• [TryFormat - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 140.49 ns | 176.86 ns | 1.26 | 0.10 | False | | |
|

• [TryFormat - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 165.29 ns | 202.06 ns | 1.22 | 0.01 | False | | |
|

• [TryFormat - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 24.47 ns | 25.98 ns | 1.06 | 0.03 | False | | |

[Test Report]()

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

Repro Steps

#### Prerequisites (Files either built locally (with build.(sh/cmd) or downloaded from payload above (if same system setup) (in this order))
- 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 $RunArch -framework net8.0`
- AOT MONO build extracted to `runtime/artifacts/bin/mono/$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 /p:CrossBuild=false /p:MonoLLVMUseCxx11Abi=false`
- 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 aot directory
mkdir -p $RunDir/artifacts/bin/aot/sgen
mkdir -p $RunDir/artifacts/bin/aot/pack
cp -r $RunDir/artifacts/obj/mono/$RunOS.$RunArch.Release/mono/* $RunDir/artifacts/bin/aot/sgen
cp -r $RunDir/artifacts/bin/microsoft.netcore.app.runtime.$RunOS-$RunArch/Release/* $RunDir/artifacts/bin/aot/pack

# 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

# 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_Int128*' --bdn-artifacts $RunDir/artifacts/BenchmarkDotNet.Artifacts --bdn-arguments="--anyCategories Libraries Runtime --category-exclusion-filter NoAOT NoWASM --runtimes monoaotllvm --aotcompilerpath $RunDir/artifacts/bin/aot/sgen/mini/mono-sgen --customruntimepack $RunDir/artifacts/bin/aot/pack --aotcompilermode llvm --logBuildOutput --generateBinLog"

# 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_Int128* --anyCategories Libraries Runtime " --category-exclusion-filter NoAOT NoWASM --runtimes monoaotllvm --aotcompilerpath $RunDir/artifacts/bin/aot/sgen/mini/mono-sgen --customruntimepack $RunDir/artifacts/bin/aot/pack --aotcompilermode llvm --logBuildOutput --generateBinLog " --artifacts $RunDir/artifacts/BenchmarkDotNet.Artifacts --packages $RunDir/performance/artifacts/packages --buildTimeout 1200
```

Windows
```cmd
# Set $RunDir to the runtime directory
$RunDir="FullPathHere"

# Set the OS, arch, and OSId
RunOS='windows'
RunOSId='win'
RunArch='x64'

# Create aot directory
mkdir $RunDir\artifacts\bin\aot\sgen
mkdir $RunDir\artifacts\bin\aot\pack
xcopy $RunDir\artifacts\obj\mono\$RunOS.$RunArch.Release\mono $RunDir\artifacts\bin\aot\sgen\ /e /y
xcopy $RunDir\artifacts\bin\microsoft.netcore.app.runtime.$RunOSId-$RunArch\Release $RunDir\artifacts\bin\aot\pack\ /e /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

# 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_Int128*' --bdn-artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --bdn-arguments="--anyCategories Libraries Runtime --category-exclusion-filter NoAOT NoWASM --runtimes monoaotllvm --aotcompilerpath $RunDir\artifacts\bin\aot\sgen\mini\mono-sgen.exe --customruntimepack $RunDir\artifacts\bin\aot\pack --aotcompilermode llvm --logBuildOutput --generateBinLog"

# 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_Int128* --anyCategories Libraries Runtime " --category-exclusion-filter NoAOT NoWASM --runtimes monoaotllvm --aotcompilerpath $RunDir\artifacts\bin\aot\sgen\mini\mono-sgen.exe --customruntimepack $RunDir\artifacts\bin\aot\pack -aotcompilermode llvm --logBuildOutput --generateBinLog " --artifacts $RunDir\artifacts\BenchmarkDotNet.Artifacts --packages $RunDir\performance\artifacts\packages --buildTimeout 1200
```

### System.Tests.Perf_Int128.TryParseSpan(value: "-170141183460469231731687303715884105728")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.Parse(value: "170141183460469231731687303715884105727")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.ParseSpan(value: "170141183460469231731687303715884105727")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.TryParseSpan(value: "170141183460469231731687303715884105727")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.TryParse(value: "170141183460469231731687303715884105727")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.TryParse(value: "-170141183460469231731687303715884105728")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.ParseSpan(value: "-170141183460469231731687303715884105728")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.Parse(value: "-170141183460469231731687303715884105728")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.Parse(value: "12345")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.ParseSpan(value: "12345")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.ToString(value: 170141183460469231731687303715884105727)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.TryParse(value: "12345")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.TryParseSpan(value: "12345")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.ToString(value: -170141183460469231731687303715884105728)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.TryFormat(value: 170141183460469231731687303715884105727)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.TryFormat(value: -170141183460469231731687303715884105728)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Tests.Perf_Int128.TryFormat(value: 12345)

#### 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)