[Perf] Windows/x64: 1 Regression on 10/8/2023 9:07:06 AM

[performanceautofiler]

Run Information

Name	Value
Architecture	x64
OS	Windows 10.0.18362
Queue	TigerWindows
Baseline	ffbdbacd95065ccced857aa8005680a010cbcbad
Compare	fa54ce8de1a19d308fe4fcc789b2db16da73a65e
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.Memory.Span<Byte>

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
ToArray - Duration of single invocation 📝 - Benchmark Source 📈 - ADX Test Multi Config Graph	35.53 ns	38.68 ns	1.09	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.Memory.Span<Byte>*'

Payloads

Baseline
Compare

System.Memory.Span<Byte>.ToArray(Size: 512)

ETL Files

Histogram

Description of detection logic

IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsRegressionBase: Marked as regression because the compare was 5% greater than the baseline, and the value was not too small.
IsRegressionChecked: Marked as regression because the three check build points were 0.05 greater than the baseline.
IsRegressionWindowed: Marked as regression because 38.68379244798027 > 37.70385985211499.
IsChangePoint: Marked as a change because one of 8/24/2023 2:47:53 PM, 10/8/2023 1:17:11 AM, 10/16/2023 8:09:45 PM falls between 10/8/2023 1:17:11 AM and 10/16/2023 8:09:45 PM.
IsRegressionStdDev: Marked as regression because -7.3248328013200235 (T) = (0 -38.45976791325608) / Math.Sqrt((0.4162839908493269 / (9)) + (0.8447551324703084 / (19))) is less than -2.055529438636913 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (9) + (19) - 2, .025) and -0.06085341664423621 = (36.25361177127999 - 38.45976791325608) / 36.25361177127999 is less than -0.05.
IsImprovementBase: Marked as not an improvement because the compare was not 5% less than the baseline, or the value was too small.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

JIT Disasms

Docs

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