[Perf] Windows/x64: 1 Regression on 9/1/2022 12:26:41 AM

[performanceautofiler]

Run Information

Architecture	x64
OS	Windows 10.0.19042
Baseline	51191575ccced7759ab2b82c7348a488f56d6f52
Compare	d684343d7fc6e050d5c7fa11298dc1b6a5ee7a0e
Diff	Diff

Regressions in System.Text.Tests.Perf_StringBuilder

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
Append_Char - Duration of single invocation	256.72 ns	272.72 ns	1.06	0.01	False

Test Report

Repro

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

Payloads

Baseline
Compare

Histogram

System.Text.Tests.Perf_StringBuilder.Append_Char(length: 100)

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 272.71716420886577 > 269.74310828593906.
IsChangePoint: Marked as a change because one of 8/17/2022 6:09:21 PM, 8/31/2022 7:50:47 PM, 9/5/2022 11:32:52 PM falls between 8/28/2022 2:29:57 AM and 9/5/2022 11:32:52 PM.
IsRegressionStdDev: Marked as regression because -63.24111965634719 (T) = (0 -272.7416278128258) / Math.Sqrt((0.36782994625625404 / (39)) + (1.2630674252808227 / (24))) is less than -1.9996235849941724 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (39) + (24) - 2, .025) and -0.06130440592568438 = (256.98718133082355 - 272.7416278128258) / 256.98718133082355 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