[Perf] Linux/arm64: 1 Regression on 3/3/2023 10:27:59 PM

[performanceautofiler]

Run Information

Architecture	arm64
OS	ubuntu 20.04
Baseline	86c04cf20b93ee96f5a276e8163b3adee2f8b0ac
Compare	507acb66e51ccc8fbe5e95f2a07ec4e3280b330c
Diff	Diff

Regressions in System.Threading.Channels.Tests.SpscUnboundedChannelPerfTests

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
ReadAsyncThenWriteAsync - Duration of single invocation	149.33 ns	173.92 ns	1.16	0.15	False

Test Report

Repro

General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

Payloads

Baseline
Compare

git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Threading.Channels.Tests.SpscUnboundedChannelPerfTests*'

Payloads

Baseline
Compare

Histogram

System.Threading.Channels.Tests.SpscUnboundedChannelPerfTests.ReadAsyncThenWriteAsync

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 173.9163346095282 > 157.06420152866392.
IsChangePoint: Marked as a change because one of 3/3/2023 4:59:02 PM, 3/9/2023 2:25:45 AM falls between 2/28/2023 7:22:28 AM and 3/9/2023 2:25:45 AM.
IsRegressionStdDev: Marked as regression because -7.8638803298022 (T) = (0 -166.1184694457315) / Math.Sqrt((7.7297971606276805 / (23)) + (62.45933363152645 / (19))) is less than -2.0210753903043583 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (23) + (19) - 2, .025) and -0.09903515552783387 = (151.14936825287427 - 166.1184694457315) / 151.14936825287427 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

[EgorBo]

Either noise or Roslyn dotnet/runtime#82479

[AndyAyersMS]

Seems to have recovered.