[Perf] Windows/x64: 2 FrozenDictionary Regressions on 1/29/2025 3:52:02 AM +00:00

[performanceautofiler]

Run Information

Name	Value
Architecture	x64
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	9b24fb60a19f62620ca1fc5e4eb2e3ae0b3b086d
Compare	bfa02766bdde4657ddd1f734e274d43e6ba3c036
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.Collections.Perf_SubstringFrozenDictionary

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
ToFrozenDictionary - Duration of single invocation ADX - Test Multi Config Graph	1.19 ms	1.29 ms	1.08	0.01	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.Collections.Perf_SubstringFrozenDictionary*'

System.Collections.Perf_SubstringFrozenDictionary.ToFrozenDictionary(Count: 10000)

ETL Files

Histogram

JIT Disasms

Docs

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

---

Run Information

Name	Value
Architecture	x64
OS	Windows 10.0.22631
Queue	ViperWindows
Baseline	9b24fb60a19f62620ca1fc5e4eb2e3ae0b3b086d
Compare	bfa02766bdde4657ddd1f734e274d43e6ba3c036
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.Collections.Perf_SingleCharFrozenDictionary

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
ToFrozenDictionary - Duration of single invocation ADX - Test Multi Config Graph	670.32 μs	769.51 μs	1.15	0.01	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.Collections.Perf_SingleCharFrozenDictionary*'

System.Collections.Perf_SingleCharFrozenDictionary.ToFrozenDictionary(Count: 10000)

ETL Files

Histogram

JIT Disasms

Docs

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

[LoopedBard3]

Definitely seems to be something here with more than one platform showing the regression. Commit range: 21ab780...d9b7515, only commit that seems potentially impactful is #110827. Any thoughts on that possibility @AndyAyersMS?

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[jeffhandley]

Assigned to @eiriktsarpalis for triage alongside #112236.