[Perf] Changes at 6/20/2022 1:54:42 AM

[performanceautofiler]

Run Information

Architecture	x64
OS	ubuntu 18.04
Baseline	222d9e9e51cfbed5742bdba8d5007f6b7a524097
Compare	1ec5ba53884aa8704416acd73299919a3ef8533b
Diff	Diff

Regressions in System.Buffers.Text.Tests.Base64Tests

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
Base64Decode - Duration of single invocation	33.91 ns	763.99 ns	22.53	0.01	False

Test Report

Repro

git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net6.0 --filter 'System.Buffers.Text.Tests.Base64Tests*'

Payloads

Baseline
Compare

Histogram

System.Buffers.Text.Tests.Base64Tests.Base64Decode(NumberOfBytes: 1000)

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 763.9880505646398 > 35.61522952859608.
IsChangePoint: Marked as a change because one of 6/19/2022 8:44:36 PM, 6/21/2022 6:07:15 AM falls between 6/12/2022 5:56:07 PM and 6/21/2022 6:07:15 AM.
IsRegressionStdDev: Marked as regression because -491.8535366750247 (T) = (0 -766.4744908018721) / Math.Sqrt((0.0023497222221480225 / (59)) + (19.96362347242179 / (9))) is less than -1.9965644189515832 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (59) + (9) - 2, .025) and -21.594504859702383 = (33.92304879266862 - 766.4744908018721) / 33.92304879266862 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

[naricc]

@a74nh I am seeing a large regression here, but I think it is because of your change to the benchmark here: dotnet/performance@281bdef. I don't see this as an issue to correct, since its just changing the benchmark. But I wanted to confirm with you.

[EgorBo]

@a74nh I am seeing a large regression here, but I think it is because of your change to the benchmark here: dotnet/performance@281bdef. I don't see this as an issue to correct, since its just changing the benchmark. But I wanted to confirm with you.

Yes, it's that, we also saw it in CoreCLR and closed 🙂