Regressions in System.Text.RegularExpressions.Tests.Perf_Regex_Industry_Mariomkas

[performanceautofiler]

Run Information

Architecture	x64
OS	alpine 3.12
Baseline	c288acdb794b1f2edba90868a823b161d88bd2b0
Compare	bed8bc7094f24360256ee4c014da3c5cadc2e3d2
Diff	Diff

Regressions in System.Text.RegularExpressions.Tests.Perf_Regex_Industry_Mariomkas

Benchmark	Baseline	Test	Test/Base	Test Quality	Edge Detector	Baseline IR	Compare IR	IR Ratio	Baseline ETL	Compare ETL
Ctor - Duration of single invocation	244.43 μs	1.41 ms	5.78	0.08	True
Ctor - Duration of single invocation	272.89 μs	1.80 ms	6.61	0.08	True
Ctor - Duration of single invocation	67.12 μs	235.76 μs	3.51	0.02	True

Test Report

Repro

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

Payloads

Baseline
Compare

Histogram

System.Text.RegularExpressions.Tests.Perf_Regex_Industry_Mariomkas.Ctor(Pattern: "[\w.+-]+@[\w.-]+.[\w.-]+", Options: NonBacktracking)

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 1.412064234237829 > 263.65086649920227.
IsChangePoint: Marked as a change because one of 4/7/2022 6:53:49 PM, 4/12/2022 4:54:37 AM falls between 4/3/2022 1:52:36 PM and 4/12/2022 4:54:37 AM.
IsRegressionStdDev: Marked as regression because -442.7266427702717 (T) = (0 -1405129.3695480844) / Math.Sqrt((70881783.0600003 / (36)) + (101775251.0448288 / (21))) is less than -2.0040447832881556 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (36) + (21) - 2, .025) and -4.635513206310686 = (249334.76652571963 - 1405129.3695480844) / 249334.76652571963 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 as regression because Edge Detector said so.

```#### System.Text.RegularExpressions.Tests.Perf_Regex_Industry_Mariomkas.Ctor(Pattern: "[\w]+://[^/\s?#]+[^\s?#]+(?:\?[^\s#]*)?(?:#[^\s]*)?", Options: NonBacktracking)

```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 1.8027213416666665 > 295.18631531519117.
IsChangePoint: Marked as a change because one of 4/7/2022 6:53:49 PM, 4/12/2022 4:54:37 AM falls between 4/3/2022 1:52:36 PM and 4/12/2022 4:54:37 AM.
IsRegressionStdDev: Marked as regression because -233.25666232436387 (T) = (0 -1847060.0217951036) / Math.Sqrt((23866940.538115114 / (36)) + (934263338.7843062 / (21))) is less than -2.0040447832881556 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (36) + (21) - 2, .025) and -5.60391858176957 = (279691.519349436 - 1847060.0217951036) / 279691.519349436 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 as regression because Edge Detector said so.

```#### System.Text.RegularExpressions.Tests.Perf_Regex_Industry_Mariomkas.Ctor(Pattern: "(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9])\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9])", Options: NonBacktracking)

```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 235.75944745523088 > 70.42950782640385.
IsChangePoint: Marked as a change because one of 4/7/2022 6:53:49 PM, 4/12/2022 4:54:37 AM falls between 4/3/2022 1:52:36 PM and 4/12/2022 4:54:37 AM.
IsRegressionStdDev: Marked as regression because -368.19084796704203 (T) = (0 -236688.0018984326) / Math.Sqrt((574525.3804394128 / (36)) + (4129276.1124053122 / (21))) is less than -2.0040447832881556 = MathNet.Numerics.Distributions.StudentT.InvCDF(0, 1, (36) + (21) - 2, .025) and -2.5366697545432917 = (66923.97603547163 - 236688.0018984326) / 66923.97603547163 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 as 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.

[EgorBo]

#67673 cc @stephentoub

[EgorBo]

ubuntu-x64 dotnet/perf-autofiling-issues#4523

[stephentoub]

Thanks. This one is expected. We had an unbounded memory leak due to a static cache, which I deleted. This test is measuring construction time, so the change essentially reverted the ctor cost to what it should have been all along, rather than reusing the objects from a previous construction of the exact same regex.