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Regressions in Span.IndexerBench #80445

@performanceautofiler

Description

@performanceautofiler

Run Information

Architecture x64
OS ubuntu 18.04
Baseline 1801b56a60576cdd156134ad80872dbf984e62e7
Compare 1808d1c812ba1d1c2873023685530c853eb8dce1
Diff Diff

Regressions in Span.IndexerBench

Benchmark Baseline Test Test/Base Test Quality Edge Detector Baseline IR Compare IR IR Ratio Baseline ETL Compare ETL
KnownSizeCtor2 - Duration of single invocation 392.43 ns 512.56 ns 1.31 0.00 False

graph
Test Report

Repro

git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'Span.IndexerBench*'
Details

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Baseline
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Histogram

Span.IndexerBench.KnownSizeCtor2(length: 1024)


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 512.5618748353747 > 411.9805494965428.
IsChangePoint: Marked as a change because one of 1/6/2023 5:32:27 AM, 1/9/2023 6:56:09 PM falls between 1/1/2023 3:57:25 AM and 1/9/2023 6:56:09 PM.
IsRegressionStdDev: Marked as regression because -538.9636427367564 (T) = (0 -512.8962182135796) / Math.Sqrt((0.7929035108989139 / (31)) + (0.33774347131446564 / (14))) is less than -2.016692199226234 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (31) + (14) - 2, .025) and -0.30594382410365073 = (392.7398780461416 - 512.8962182135796) / 392.7398780461416 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

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Priority:2Work that is important, but not critical for the releasearch-x64area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIos-linuxLinux OS (any supported distro)tenet-performancePerformance related issuetenet-performance-benchmarksIssue from performance benchmark

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