[Perf 59%] System.Collections.CtorFromCollection<Int32>.Dictionary

[performanceautofiler]

Run Information

Architecture	x64
OS	ubuntu 18.04
Changes	diff

Regressions in System.Collections.CtorFromCollection

Benchmark	Baseline	Test	Test/Base	Modality	Baseline Outlier	Baseline ETL	Comapre ETL
Dictionary	75.59 μs	31.26 μs	0.41	Bimodal	True

Related Issue on x64 Windows

[Perf 69%] System.Collections.CtorFromCollection.Dictionary

Related Issue on x86 Windows

[Perf 55%] System.Collections.CtorFromCollection.Dictionary

Historical Data in Reporting System

Repro

git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f netcoreapp5.0 --filter 'System.Collections.CtorFromCollection<Int32>*'

Histogram

System.Collections.CtorFromCollection.Dictionary(Size: 512)

[26533.138 ; 41060.631) | @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
[41060.631 ; 55588.125) | 
[55588.125 ; 70267.213) | 
[70267.213 ; 84794.706) | @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

Docs

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