[Perf] Linux/x64: 1 Regression on 5/1/2023 3:42:23 PM

[performanceautofiler]

Run Information

Name	Value
Architecture	x64
OS	ubuntu 18.04
Queue	TigerUbuntu
Baseline	79647f40acc3bc3dd0e6fa14e4a158cad6d63c05
Compare	6f19e373de35dbf2c68f8744cc48c1bfeb13644f
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.Memory.ReadOnlySpan

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
IndexOfString - Duration of single invocation	9.58 ns	10.62 ns	1.11	0.10	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.Memory.ReadOnlySpan*'

Payloads

Baseline
Compare

Histogram

System.Memory.ReadOnlySpan.IndexOfString(input: "Hello WorldbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbareallyreallylongHello WorldbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbareallyreallylongHello Worldbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbareallyreallylong!xyz", value: "w", comparisonType: OrdinalIgnoreCase)

Description of detection logic

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.
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 10.615415445379288 > 10.05277302575014.
IsChangePoint: Marked as a change because one of 4/25/2023 6:46:56 PM, 5/1/2023 10:17:01 AM, 5/8/2023 3:52:55 PM falls between 4/29/2023 8:32:21 PM and 5/8/2023 3:52:55 PM.
IsRegressionStdDev: Marked as regression because -14.288433414018426 (T) = (0 -10.795202419903212) / Math.Sqrt((0.010671620817211017 / (17)) + (0.15729727800631788 / (27))) is less than -2.0180817028167235 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (17) + (27) - 2, .025) and -0.11898064795519524 = (9.647353991000799 - 10.795202419903212) / 9.647353991000799 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.

JIT Disasms

Docs

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

[cincuranet]

Probably caused by dotnet/runtime#85275.