[Perf] Regressions in System.Buffers.Tests.ReadOnlySequenceTests<Char>

[performanceautofiler]

Run Information

Architecture	x64
OS	ubuntu 18.04
Baseline	d5f084e5a36eec83f60beccfed9ded3f4473a5bf
Compare	a959c3ee2f4ae21e1eb3a6d8f4089ecdea76d649
Diff	Diff

Regressions in System.Buffers.Tests.ReadOnlySequenceTests<Char>

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
IterateGetPositionSingleSegment - Duration of single invocation	24.72 ns	28.37 ns	1.15	0.01	False

Test Report

Repro

git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net6.0 --filter 'System.Buffers.Tests.ReadOnlySequenceTests<Char>*'

Details

Payloads

Baseline
Compare

Histogram

System.Buffers.Tests.ReadOnlySequenceTests<Char>.IterateGetPositionSingleSegment

Description of detection logic

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 28.369058968107264 > 25.781877849520292.
IsChangePoint: Marked as a change because one of 7/6/2022 8:41:56 AM, 7/7/2022 8:07:51 AM, 7/10/2022 1:04:01 AM, 7/12/2022 6:44:07 AM falls between 7/3/2022 4:26:07 AM and 7/12/2022 6:44:07 AM.
IsRegressionStdDev: Marked as regression because -19.338758191386955 (T) = (0 -28.53801561815454) / Math.Sqrt((1.6597572016153006 / (63)) + (0.012445950010533183 / (13))) is less than -1.9925434951804422 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (63) + (13) - 2, .025) and -0.12609010832209647 = (25.342568420813965 - 28.53801561815454) / 25.342568420813965 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.

Docs

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

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