[Perf] Regressions in Microsoft.Extensions.Primitives.StringSegmentBenchmark

[performanceautofiler]

Run Information

Architecture	arm64
OS	ubuntu 20.04
Baseline	b09ae1ad36858f526b68a005c6f6b2cf8f7ab4b6
Compare	625a9cdd4437a414f1fda220f5bacba101f209c8
Diff	Diff

Regressions in Microsoft.Extensions.Primitives.StringSegmentBenchmark

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
LastIndexOf - Duration of single invocation	2.75 ns	4.88 ns	1.78	0.23	False

Test Report

Repro

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net6.0 --filter 'Microsoft.Extensions.Primitives.StringSegmentBenchmark*'

Details

Payloads

Baseline
Compare

Histogram

Microsoft.Extensions.Primitives.StringSegmentBenchmark.LastIndexOf

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 4.87501562668358 > 3.1972914082750723.
IsChangePoint: Marked as a change because one of 5/20/2022 7:31:10 PM, 6/2/2022 10:27:31 PM, 6/9/2022 4:58:43 AM falls between 5/31/2022 10:47:41 AM and 6/9/2022 4:58:43 AM.
IsRegressionStdDev: Marked as regression because -34.553061487659434 (T) = (0 -5.3353692196015245) / Math.Sqrt((0.008708534020578838 / (21)) + (0.104919283686032 / (25))) is less than -2.0153675744421933 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (21) + (25) - 2, .025) and -0.7850322745270233 = (2.9889483208449144 - 5.3353692196015245) / 2.9889483208449144 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

### Run Information

Architecture	arm64
OS	ubuntu 20.04
Baseline	b09ae1ad36858f526b68a005c6f6b2cf8f7ab4b6
Compare	625a9cdd4437a414f1fda220f5bacba101f209c8
Diff	Diff

Regressions in System.Buffers.Tests.RentReturnArrayPoolTests<Byte>

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
ProducerConsumer - Duration of single invocation	792.53 ns	1.02 μs	1.28	0.61	False

Test Report

Repro

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

Details

Payloads

Baseline
Compare

Histogram

System.Buffers.Tests.RentReturnArrayPoolTests<Byte>.ProducerConsumer(RentalSize: 4096, ManipulateArray: False, Async: True, UseSharedPool: False)

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 1.017125941 > 847.1907515531251.
IsChangePoint: Marked as a change because one of 5/23/2022 1:47:22 PM, 6/2/2022 10:27:31 PM, 6/9/2022 4:58:43 AM falls between 5/31/2022 10:47:41 AM and 6/9/2022 4:58:43 AM.
IsRegressionStdDev: Marked as regression because -13.284601832092536 (T) = (0 -1208.7045763563606) / Math.Sqrt((1741.790102938255 / (21)) + (19307.131931795648 / (25))) is less than -2.0153675744421933 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (21) + (25) - 2, .025) and -0.47365972785309757 = (820.2060173804592 - 1208.7045763563606) / 820.2060173804592 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

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[DrewScoggins]

Seems related to #70171