[Perf] Linux/x64: 2 Regressions on 7/26/2023 8:42:30 AM

[performanceautofiler]

Run Information

Name	Value
Architecture	x64
OS	ubuntu 18.04
Queue	TigerUbuntu
Baseline	764f77412ef4ec1a7e5dc521608247487a66cd7e
Compare	bc23bf4ee16cbd1999105b1916e1f2f76baef6a7
Diff	Diff
Configs	CompilationMode:tiered, RunKind:micro

Regressions in System.Buffers.Tests.RentReturnArrayPoolTests<Object>

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio
MultipleSerial - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	484.23 ns	927.68 ns	1.92	0.27	False
MultipleSerial - Duration of single invocation 📝 - Benchmark Source ADX - Test Multi Config Graph	16.70 μs	17.58 μs	1.05	0.00	False

Test Report

Repro

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

git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Tests.RentReturnArrayPoolTests<Object>*'

Payloads

Baseline
Compare

System.Buffers.Tests.RentReturnArrayPoolTests<Object>.MultipleSerial(RentalSize: 4096, ManipulateArray: False, Async: False, UseSharedPool: True)

ETL Files

Histogram

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 we could not find enough baseline builds for window checking.
IsChangePoint: Marked as a change because one of 5/11/2023 9:15:05 PM, 7/26/2023 12:02:55 AM, 8/3/2023 7:53:20 AM falls between 7/25/2023 7:04:35 PM and 8/3/2023 7:53:20 AM.
IsRegressionStdDev: Marked as regression because -50.6762255214552 (T) = (0 -936.9749128900002) / Math.Sqrt((322.7095038489696 / (5)) + (363.9398097029332 / (25))) is less than -2.048407141790485 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (5) + (25) - 2, .025) and -0.9268565820636854 = (486.2712262095238 - 936.9749128900002) / 486.2712262095238 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

System.Buffers.Tests.RentReturnArrayPoolTests<Object>.MultipleSerial(RentalSize: 4096, ManipulateArray: True, Async: False, UseSharedPool: True)

ETL Files

Histogram

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 we could not find enough baseline builds for window checking.
IsChangePoint: Marked as a change because one of 5/12/2023 10:43:40 AM, 7/26/2023 12:02:55 AM, 8/3/2023 7:53:20 AM falls between 7/25/2023 7:04:35 PM and 8/3/2023 7:53:20 AM.
IsRegressionStdDev: Marked as regression because -18.938395806669764 (T) = (0 -17508.592051938645) / Math.Sqrt((5520.077504935586 / (4)) + (18974.84586139076 / (24))) is less than -2.055529438636913 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (4) + (24) - 2, .025) and -0.053069204021344775 = (16626.250188571426 - 17508.592051938645) / 16626.250188571426 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]

dotnet/runtime#87847