[Perf] Alpine/x64: 1 Improvement on 3/21/2023 4:52:34 PM

[performanceautofiler]

Run Information

Name	Value
Architecture	x64
OS	alpine 3.15
Queue	TigerAlpine
Baseline	8c5cf110b4d2fa0b98cad4b60e4abba5a6562c58
Compare	7b82cdf019aff3227d882a15c12eeb3c189bb22d
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Improvements in System.Tests.Perf_String

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
PadLeft - Duration of single invocation	10.05 ns	8.85 ns	0.88	0.13	False

Test Report

Repro

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

Payloads

Baseline
Compare

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

Payloads

Baseline
Compare

Histogram

System.Tests.Perf_String.PadLeft(n: 18)

Description of detection logic

IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 8.853356592943326 < 9.577440631185242.
IsChangePoint: Marked as a change because one of 2/9/2023 12:40:40 PM, 3/21/2023 12:39:01 PM, 3/28/2023 8:13:28 AM falls between 3/19/2023 2:30:51 PM and 3/28/2023 8:13:28 AM.
IsImprovementStdDev: Marked as improvement because 24.46079965922733 (T) = (0 -8.498659342445677) / Math.Sqrt((0.16350284179504823 / (299)) + (0.11991176184188876 / (37))) is greater than 1.9670919629190173 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (37) - 2, .975) and 0.15048067901661133 = (10.004080110394403 - 8.498659342445677) / 10.004080110394403 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

Docs

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

[EgorBo]

dotnet/runtime#83638