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[Perf] Regressions in System.Memory.Span<Char> #76027
Description
Regressions in System.Memory.Span<Char>
| Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio | Baseline ETL | Compare ETL |
|---|---|---|---|---|---|---|---|---|---|---|
| LastIndexOfValue - Duration of single invocation | 29.35 ns | 33.23 ns | 1.13 | 0.03 | False |
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Repro
git clone https://github.com/dotnet/performance.git
py .\performance\scripts\benchmarks_ci.py -f net6.0 --filter 'System.Memory.Span<Char>*'Details
Payloads
Histogram
Edge Detector Info
System.Memory.Span<Char>.LastIndexOfValue(Size: 512)
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 33.234352970999026 > 30.80907330059995.
IsChangePoint: Marked as a change because one of 7/2/2022 7:35:06 PM, 7/6/2022 3:55:24 AM, 8/17/2022 10:14:53 AM, 9/13/2022 2:36:07 PM, 9/22/2022 3:16:12 AM falls between 9/13/2022 2:36:07 PM and 9/22/2022 3:16:12 AM.
IsRegressionStdDev: Marked as regression because -15.831977795834955 (T) = (0 -31.808116157488204) / Math.Sqrt((0.011066090212876852 / (15)) + (0.9197330397655085 / (38))) is less than -2.007583770314729 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (15) + (38) - 2, .025) and -0.08531215543829654 = (29.307804209234803 - 31.808116157488204) / 29.307804209234803 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.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.
Docs
Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository
Activity
[-][Perf] Windows/arm64: 1 Regression on 9/13/2022 6:36:50 PM[/-][+][Perf] Regressions in System.Memory.Span<Char>[/+]10 remaining items
DrewScoggins commentedon Sep 22, 2022
Seems related to #75857
adamsitnik commentedon Sep 24, 2022
It went up, and down after a few days:
Since #75857 was a bug fix and we can't revert even if it caused a regression, I am going to close the issue.