[Perf] Linux/x64: 2 Regressions on 9/18/2024 5:35:53 PM

[performanceautofiler[bot]]

Run Information

Name	Value
Architecture	x64
OS	ubuntu 22.04
Queue	ViperUbuntu
Baseline	24e7d1b0959234a36fb09a5c64cfd2da20f10618
Compare	128fdfd1fd982e277e969d5c7ca1710345f4f649
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.Buffers.Text.Tests.Base64Tests

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
[Base64EncodeDestinationTooSmall - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.Buffers.Text.Tests.Base64Tests.Base64EncodeDestinationTooSmall(NumberOfBytes%3a%201000).html>) 📝 - Benchmark Source ADX - Test Multi Config Graph	29.27 ns	32.99 ns	1.13	0.16	False
[ConvertToBase64CharArray - Duration of single invocation](<https://pvscmdupload.z22.web.core.windows.net/reports/allTestHistory/refs/heads/main_x64_ubuntu 22.04/ViperUbuntu/System.Buffers.Text.Tests.Base64Tests.ConvertToBase64CharArray(NumberOfBytes%3a%201000).html>) 📝 - Benchmark Source ADX - Test Multi Config Graph	69.55 ns	84.77 ns	1.22	0.08	False

Test Report

Repro

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

git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Text.Tests.Base64Tests*'

### System.Buffers.Text.Tests.Base64Tests.Base64EncodeDestinationTooSmall(NumberOfBytes: 1000) #### ETL Files #### Histogram #### JIT Disasms ### System.Buffers.Text.Tests.Base64Tests.ConvertToBase64CharArray(NumberOfBytes: 1000) #### 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)

[LoopedBard3]

No clear cause, marking as look again to see if these last more than a week.