[Perf] Changes at 7/12/2022 7:47:24 PM

[performanceautofiler]

Run Information

Architecture	x64
OS	ubuntu 18.04
Baseline	246f2458fef4db3ed93d0a7f440e969f548b57c9
Compare	388dd6c54c75ccad519ca094e3ddaa53a5c90d63
Diff	Diff

Improvements in System.Text.Tests.Perf_StringBuilder

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
Append_Char_Capacity - Duration of single invocation	118.73 μs	110.78 μs	0.93	0.00	False
Append_Char_Capacity - Duration of single invocation	131.71 ns	121.62 ns	0.92	0.04	False

Test Report

Repro

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

Details

Payloads

Baseline
Compare

Histogram

System.Text.Tests.Perf_StringBuilder.Append_Char_Capacity(length: 100000)

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 110.77918182322485 < 112.82391941476492.
IsChangePoint: Marked as a change because one of 7/12/2022 12:16:14 PM, 7/18/2022 2:17:16 AM falls between 7/8/2022 10:31:34 AM and 7/18/2022 2:17:16 AM.
IsImprovementStdDev: Marked as improvement because 221.68807536428628 (T) = (0 -110883.10715668758) / Math.Sqrt((345707.8704717897 / (299)) + (21373.675939071916 / (36))) is greater than 1.9671134448822736 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (36) - 2, .975) and 0.0771798549043284 = (120156.79083944573 - 110883.10715668758) / 120156.79083944573 is greater than 0.05.
IsChangeEdgeDetector: Marked not as a regression because Edge Detector said so.

```#### System.Text.Tests.Perf_StringBuilder.Append_Char_Capacity(length: 100)

```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 121.61889965957278 < 125.51937173825138.
IsChangePoint: Marked as a change because one of 7/12/2022 12:16:14 PM, 7/18/2022 2:17:16 AM falls between 7/8/2022 10:31:34 AM and 7/18/2022 2:17:16 AM.
IsImprovementStdDev: Marked as improvement because 39.7620149336313 (T) = (0 -120.6559638498554) / Math.Sqrt((5.008242306416933 / (299)) + (2.9731468293654686 / (36))) is greater than 1.9671134448822736 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (299) + (36) - 2, .975) and 0.0940934425882779 = (133.1880897237163 - 120.6559638498554) / 133.1880897237163 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]

Could be related to dotnet/runtime#71968

Actually that would have just impacted Arm64.

So something related to dotnet/runtime#67448.

dotnet/runtime@cf2187b...c5005e0