[Perf] Linux/x64: 1 Regression on 8/29/2024 2:08:41 AM

[performanceautofiler]

Run Information

Name	Value
Architecture	x64
OS	ubuntu 22.04
Queue	ViperUbuntu
Baseline	1b5c48dc5958e20b4aa0f4cbfc21fddb8f81052c
Compare	2e7ee69fbcd2e653e2728cfb64e8a0faf9829e09
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.Numerics.Tests.Perf_BitOperations

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
TrailingZeroCount_ulong - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	277.48 ns	367.18 ns	1.32	0.24	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.Numerics.Tests.Perf_BitOperations*'

Details

System.Numerics.Tests.Perf_BitOperations.TrailingZeroCount_ulong

ETL Files

Histogram

JIT Disasms

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

[LoopedBard3]

Transfering this to start investigation into extreme increase in noisiness around July 19th. This noisiness increase seems to only be on the Viper machines and affects both Linux and Windows.

[LoopedBard3]

@AndyAyersMS @EgorBo

[EgorBo]

@EgorBot -amd -commit 39968e7 vs previous --filter System.Numerics.Tests.Perf_BitOperations.TrailingZeroCount_ulong