[Perf] Changes at 6/20/2022 7:45:04 PM

[performanceautofiler]

Run Information

Architecture	arm64
OS	ubuntu 18.04
Baseline	38794de5f2e3198b28df0915e82e33ab3d91f2ee
Compare	715c71ae6af5775402e54d3b8ab6c4a888da3cb5
Diff	Diff

Improvements 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
Base64EncodeDestinationTooSmall - Duration of single invocation	2.44 μs	666.61 ns	0.27	0.47	False
Base64Encode - Duration of single invocation	1.18 μs	651.63 ns	0.55	0.35	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.Base64EncodeDestinationTooSmall(NumberOfBytes: 1000)

Description of detection logic

IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 666.6106194658362 < 2.313241345586427.
IsChangePoint: Marked as a change because one of 5/14/2022 8:55:12 PM, 5/17/2022 2:28:28 PM, 6/20/2022 12:28:47 PM, 6/23/2022 3:07:42 AM falls between 6/14/2022 10:05:19 AM and 6/23/2022 3:07:42 AM.
IsImprovementStdDev: Marked as improvement because 34.123585709662066 (T) = (0 -650.9448066640068) / Math.Sqrt((315425.27536804497 / (299)) + (333.30026065289036 / (10))) is greater than 1.9677212881555053 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (10) - 2, .975) and 0.6336095862081514 = (1776.6425707682884 - 650.9448066640068) / 1776.6425707682884 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Buffers.Text.Tests.Base64Tests.Base64Encode(NumberOfBytes: 1000)

```log

Description of detection logic

IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsRegressionBase: Marked as not a regression because the compare was not 5% greater than the baseline, or the value was too small.
IsImprovementBase: Marked as improvement because the compare was 5% less than the baseline, and the value was not too small.
IsImprovementCheck: Marked as improvement because the three check build points were 0.05 less than the baseline.
IsImprovementWindowed:Marked as improvement because 651.6310521119808 < 1.7224788683767829.
IsChangePoint: Marked as a change because one of 5/13/2022 7:38:09 AM, 6/12/2022 7:55:55 PM, 6/20/2022 8:00:57 AM, 6/23/2022 3:07:42 AM falls between 6/14/2022 10:05:19 AM and 6/23/2022 3:07:42 AM.
IsImprovementStdDev: Marked as improvement because 34.00272457604238 (T) = (0 -632.0621732338146) / Math.Sqrt((273571.5626891491 / (299)) + (102.75178497353076 / (11))) is greater than 1.9676960046166507 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (11) - 2, .975) and 0.6205702028084524 = (1665.821129263421 - 632.0621732338146) / 1665.821129263421 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

Docs

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

[kunalspathak]

Mostly from dotnet/runtime#70654 but the test is unstable.