[Perf] Linux/arm64: 1 Improvement on 1/27/2023 2:26:56 PM

[performanceautofiler]

Run Information

Architecture	arm64
OS	ubuntu 20.04
Baseline	f60d188f16f3843eddc0116ee47a7c0f85a08cb2
Compare	ddfaf2750e8dcf127a8baf0a3e5a2bd4835f79c7
Diff	Diff

Improvements 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	352.92 μs	290.55 μs	0.82	0.27	False

Test Report

Repro

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

Payloads

Baseline
Compare

Histogram

System.Text.Tests.Perf_StringBuilder.Append_Char(length: 100000)

Description of detection logic

IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 290.55491843749996 < 335.24063882680974.
IsChangePoint: Marked as a change because one of 10/21/2022 2:21:13 AM, 1/27/2023 3:43:27 AM, 2/2/2023 2:17:49 AM falls between 1/24/2023 11:54:43 AM and 2/2/2023 2:17:49 AM.
IsImprovementStdDev: Marked as improvement because 13.361049752663295 (T) = (0 -275847.28872902185) / Math.Sqrt((406945434.78849775 / (299)) + (478151286.5111328 / (18))) is greater than 1.9675235316906419 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (18) - 2, .975) and 0.20379488321497025 = (346452.5445941072 - 275847.28872902185) / 346452.5445941072 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

Docs

Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository

[kunalspathak]

dotnet/runtime#77540