[Perf] Windows/x64: System.Text.Tests.Perf_StringBuilder Regression on 7/8/2025 10:25:16 PM +00:00

[performanceautofiler]

Run Information

Name	Value
Architecture	x64
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	6d869a82ccbad6c279da52f9bd507057e6e30495
Compare	9f9f4a464b3d2c868a12b6c692dde0461c5ea78c
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.Text.Tests.Perf_StringBuilder

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
Append_Memory - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	260.14 ns	275.15 ns	1.06	0.11	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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Tests.Perf_StringBuilder*'

Details

System.Text.Tests.Perf_StringBuilder.Append_Memory

ETL Files

Histogram

JIT Disasms

Docs

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

[LoopedBard3]

Nothing clear in range: d4c1aa9...2c426a1, marking look again.

Related:

• [Perf] Windows/x64: 7 Regressions on 7/8/2025 10:25:16 PM +00:00 perf-autofiling-issues#59308 (Only the Tar test is still regressed)

[LoopedBard3]

Still unclear the cause but it seems that this affected most if not all configuration (OS, ARCH). Going to go ahead and transfer.