[Perf] Changes at 1/21/2022 9:08:44 PM

[performanceautofiler]

Run Information

Architecture	x64
OS	ubuntu 18.04
Baseline	024082891c683163c6fa2107fc019e39e9ccf04e
Compare	455551b2ff8f854a3e05a0c1eeb86c71dc849f8f
Diff	Diff

Regressions in System.Text.Json.Serialization.Tests.WriteJson<HashSet<String>>

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
SerializeToStream - Duration of single invocation	5.10 μs	5.40 μs	1.06	0.02	False

Test Report

Repro

git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net6.0 --filter 'System.Text.Json.Serialization.Tests.WriteJson<HashSet<String>>*'

Details

Payloads

Baseline
Compare

Histogram

System.Text.Json.Serialization.Tests.WriteJson<HashSet<String>>.SerializeToStream

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 5.39765867464067 > 5.337919891580589.
IsChangePoint: Marked as a change because one of 11/22/2021 6:07:11 PM, 12/2/2021 8:37:26 PM, 12/7/2021 2:32:08 PM, 1/21/2022 6:10:04 PM, 1/25/2022 5:49:56 AM falls between 1/16/2022 5:21:52 PM and 1/25/2022 5:49:56 AM.
IsRegressionStdDev: Marked as regression because -11.941132200158801 (T) = (0 -5431.095753868369) / Math.Sqrt((1499.7138425297271 / (45)) + (15372.332225547621 / (22))) is less than -1.997137908391408 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (45) + (22) - 2, .025) and -0.06325139674125888 = (5108.007166051267 - 5431.095753868369) / 5108.007166051267 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

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.

[kunalspathak]

Most likely related to #63462. @SingleAccretion

Tagging subscribers to this area: @JulieLeeMSFT
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Run Information

Architecture	x64
OS	ubuntu 18.04
Baseline	024082891c683163c6fa2107fc019e39e9ccf04e
Compare	455551b2ff8f854a3e05a0c1eeb86c71dc849f8f
Diff	Diff

Regressions in System.Text.Json.Serialization.Tests.WriteJson<HashSet<String>>

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
SerializeToStream - Duration of single invocation	5.10 μs	5.40 μs	1.06	0.02	False

Test Report

Repro

git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net6.0 --filter 'System.Text.Json.Serialization.Tests.WriteJson<HashSet<String>>*'

Details

Payloads

Baseline
Compare

Histogram

System.Text.Json.Serialization.Tests.WriteJson<HashSet<String>>.SerializeToStream

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 5.39765867464067 > 5.337919891580589.
IsChangePoint: Marked as a change because one of 11/22/2021 6:07:11 PM, 12/2/2021 8:37:26 PM, 12/7/2021 2:32:08 PM, 1/21/2022 6:10:04 PM, 1/25/2022 5:49:56 AM falls between 1/16/2022 5:21:52 PM and 1/25/2022 5:49:56 AM.
IsRegressionStdDev: Marked as regression because -11.941132200158801 (T) = (0 -5431.095753868369) / Math.Sqrt((1499.7138425297271 / (45)) + (15372.332225547621 / (22))) is less than -1.997137908391408 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (45) + (22) - 2, .025) and -0.06325139674125888 = (5108.007166051267 - 5431.095753868369) / 5108.007166051267 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

Author:	performanceautofiler[bot]
Assignees:	-
Labels:	os-linux, arch-x64, area-CodeGen-coreclr, untriaged
Milestone:	-

[SingleAccretion]

Will take a look.

[SingleAccretion]

I checked the regression by using the attached base/diff Core_Roots locally, and could not reproduce it. I have also checked with custom runtime builds against the 132cc2f -> 1d3c23d -> 651fa6d diff, and the full diff and similarly, could not reproduce the regression.