[Perf] Windows/arm64: 1 Regression on 10/14/2022 1:19:37 PM

[performanceautofiler]

Run Information

Architecture	arm64
OS	Windows 10.0.19041
Baseline	8bc9a0748ea2e0b28041ac48100d266aacd27108
Compare	8a9ca1abf68f080877066101ed71619926b60c39
Diff	Diff

Regressions in System.Buffers.Text.Tests.Base64Tests

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
Base64Decode - Duration of single invocation	317.89 ns	336.81 ns	1.06	0.00	False

Test Report

Repro

git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net6.0 --filter 'System.Buffers.Text.Tests.Base64Tests*'

Related Issues

Regressions

• [Perf] Alpine/x64: 1 Regression on 10/14/2022 1:19:37 PM

Improvements

• [Perf] Windows/x64: 6 Improvements on 10/14/2022 1:19:37 PM
• [Perf] Windows/x64: 11 Improvements on 10/14/2022 1:19:37 PM

Payloads

Baseline
Compare

Histogram

Edge Detector Info

Collection Data

System.Buffers.Text.Tests.Base64Tests.Base64Decode(NumberOfBytes: 1000)

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 we could not find enough baseline builds for window checking.
IsChangePoint: Marked as a change because one of 8/11/2022 10:02:44 AM, 10/14/2022 9:06:25 AM, 10/19/2022 4:51:05 PM falls between 10/10/2022 11:56:05 PM and 10/19/2022 4:51:05 PM.
IsRegressionStdDev: Marked as regression because -112.5922410400257 (T) = (0 -336.65625989089597) / Math.Sqrt((0.22055283426648795 / (16)) + (0.2325001356267319 / (16))) is less than -2.0422724562973107 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (16) + (16) - 2, .025) and -0.05963373992248857 = (317.71002300806515 - 336.65625989089597) / 317.71002300806515 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]

The only suspect is dotnet/runtime#76451 but the benchmark doesn't allocate