[Perf] Linux/arm64: 2 Regressions on 10/18/2022 8:25:03 PM

[performanceautofiler]

Run Information

Architecture	arm64
OS	ubuntu 20.04
Baseline	8393c4eb74afecaa70267b2a94b9b94c1d1ae384
Compare	51e3afb2ba42609c3711cb50fb5eaa6800bc1fde
Diff	Diff

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

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
FirstArray - Duration of single invocation	6.51 ns	7.95 ns	1.22	0.09	False
FirstMemory - Duration of single invocation	7.38 ns	8.45 ns	1.14	0.28	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.ReadOnlySequenceTests<Byte>*'

Related Issues

Regressions

Improvements

Payloads

Baseline
Compare

Histogram

Edge Detector Info

Collection Data

System.Buffers.Tests.ReadOnlySequenceTests<Byte>.FirstArray

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.
IsRegressionWindowed: Marked as regression because 7.952724166422694 > 6.824157952021474.
IsChangePoint: Marked as a change because one of 9/20/2022 10:35:57 PM, 10/18/2022 9:26:37 AM, 10/19/2022 4:51:05 PM falls between 10/7/2022 4:12:34 PM and 10/19/2022 4:51:05 PM.
IsRegressionStdDev: Marked as regression because -9.049549192805173 (T) = (0 -7.702637510101087) / Math.Sqrt((0.028537228779404827 / (35)) + (0.04690905570588337 / (3))) is less than -2.028094000977961 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (35) + (3) - 2, .025) and -0.177430450892828 = (6.54190445326116 - 7.702637510101087) / 6.54190445326116 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.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Buffers.Tests.ReadOnlySequenceTests<Byte>.FirstMemory

```log

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.
IsRegressionWindowed: Marked as regression because 8.446821847513366 > 7.9356492431034695.
IsChangePoint: Marked as a change because one of 9/20/2022 10:35:57 PM, 10/18/2022 9:26:37 AM, 10/19/2022 4:51:05 PM falls between 10/7/2022 4:12:34 PM and 10/19/2022 4:51:05 PM.
IsRegressionStdDev: Marked as regression because -6.30805976307018 (T) = (0 -8.802472455391474) / Math.Sqrt((0.1056588392394114 / (35)) + (0.10533689800723035 / (3))) is less than -2.028094000977961 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (35) + (3) - 2, .025) and -0.16270481053602512 = (7.57068550471843 - 8.802472455391474) / 7.57068550471843 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.
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]

Can be dotnet/runtime#76730 but lets look again later

[AndyAyersMS]

Regression was real but looks like we just got some of this back