[Perf] Linux/x64: 5 Regressions on 11/17/2022 12:32:52 PM

[performanceautofiler]

Run Information

Architecture	x64
OS	ubuntu 18.04
Baseline	e2c0735927642a11162c0d12799be2921bd1c984
Compare	4acfa64fe963203c347e68f4adfc66de516967e4
Diff	Diff

Regressions 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
ToString_SingleSegment - Duration of single invocation	70.08 μs	81.32 μs	1.16	0.09	False
Append_Char - Duration of single invocation	2.79 μs	3.04 μs	1.09	0.07	False
Append_Char - Duration of single invocation	2.08 ms	2.31 ms	1.11	0.13	False
Append_Char_Capacity - Duration of single invocation	2.18 μs	2.42 μs	1.11	0.09	False
Append_Char_Capacity - Duration of single invocation	2.07 ms	2.31 ms	1.11	0.10	False

Test Report

Repro

git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Text.Tests.Perf_StringBuilder*'

Payloads

Baseline
Compare

Histogram

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

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 81.31830226876092 > 73.33566479875233.
IsChangePoint: Marked as a change because one of 11/17/2022 4:58:45 AM, 11/22/2022 2:20:42 AM falls between 11/9/2022 12:33:05 PM and 11/22/2022 2:20:42 AM.
IsRegressionStdDev: Marked as regression because -8.742373297932168 (T) = (0 -79287.7640078365) / Math.Sqrt((6367863.092334642 / (25)) + (16406218.490163228 / (22))) is less than -2.0141033888794695 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (25) + (22) - 2, .025) and -0.12395696316361432 = (70543.41634635576 - 79287.7640078365) / 70543.41634635576 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.

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

```log

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 3.040995708822793 > 2.9347336728697218.
IsChangePoint: Marked as a change because one of 7/31/2022 5:42:25 AM, 11/15/2022 8:48:03 PM, 11/22/2022 2:20:42 AM falls between 11/9/2022 12:33:05 PM and 11/22/2022 2:20:42 AM.
IsRegressionStdDev: Marked as regression because -19.661992936967057 (T) = (0 -3063.5104540299253) / Math.Sqrt((299.63701425348734 / (19)) + (4814.59045315591 / (28))) is less than -2.0141033888794695 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (19) + (28) - 2, .025) and -0.09641349997843048 = (2794.119603680722 - 3063.5104540299253) / 2794.119603680722 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.

```#### System.Text.Tests.Perf_StringBuilder.Append_Char(length: 100000)

```log

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 2.309316656547619 > 2.1859646965820314.
IsChangePoint: Marked as a change because one of 8/5/2022 10:47:59 PM, 11/15/2022 8:48:03 PM, 11/22/2022 2:20:42 AM falls between 11/9/2022 12:33:05 PM and 11/22/2022 2:20:42 AM.
IsRegressionStdDev: Marked as regression because -22.387438715555096 (T) = (0 -2317815.0615972145) / Math.Sqrt((434514666.46297526 / (19)) + (2217621692.8016944 / (28))) is less than -2.0141033888794695 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (19) + (28) - 2, .025) and -0.1081352774510591 = (2091635.478773557 - 2317815.0615972145) / 2091635.478773557 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.

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

```log

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 2.424258876026019 > 2.2893951351459925.
IsChangePoint: Marked as a change because one of 8/5/2022 4:49:35 PM, 11/15/2022 8:48:03 PM, 11/22/2022 2:20:42 AM falls between 11/9/2022 12:33:05 PM and 11/22/2022 2:20:42 AM.
IsRegressionStdDev: Marked as regression because -25.330662490296547 (T) = (0 -2398.1996861188095) / Math.Sqrt((556.4568884743647 / (19)) + (1107.815788329115 / (28))) is less than -2.0141033888794695 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (19) + (28) - 2, .025) and -0.09606276477483684 = (2188.0130985121727 - 2398.1996861188095) / 2188.0130985121727 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.

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

```log

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 2.3086054489795913 > 2.177749192089844.
IsChangePoint: Marked as a change because one of 8/5/2022 12:58:40 PM, 11/15/2022 8:48:03 PM, 11/22/2022 2:20:42 AM falls between 11/9/2022 12:33:05 PM and 11/22/2022 2:20:42 AM.
IsRegressionStdDev: Marked as regression because -12.173025083340894 (T) = (0 -2331423.376932115) / Math.Sqrt((615139122.3983808 / (19)) + (10368983884.687943 / (28))) is less than -2.0141033888794695 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (19) + (28) - 2, .025) and -0.11704022922555754 = (2087143.6103500833 - 2331423.376932115) / 2087143.6103500833 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

[kotlarmilos]

Regression in ce58915

[dotnet-issue-labeler]

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

[kotlarmilos]

Fixed by 5a7d46b