1840142 - 2400 - 11.9% perf_reftest only-children-1.html / perf_reftest + 51 more (Linux, OSX, Windows) regression on Mon June 19 2023

Status: RESOLVED WONTFIX

(Core :: CSS Parsing and Computation, defect)

Description

[Andrej (:aglavic)]

Perfherder has detected a talos performance regression from push b040fff76ed7ecee270c125c9c3229c5e9ee1ff0. As author of one of the patches included in that push, we need your help to address this regression.

Regressions:

Ratio	Test	Platform	Options	Absolute values (old vs new)
2400%	perf_reftest only-children-1.html	linux1804-64-shippable-qr	e10s fission stylo webrender	0.02 -> 0.38
1874%	perf_reftest_singletons only-children-1.html	linux1804-64-shippable-qr	e10s fission stylo webrender	0.08 -> 1.61
1833%	perf_reftest only-children-1.html	linux1804-64-shippable-qr	e10s fission stylo webrender-sw	0.02 -> 0.29
1739%	perf_reftest_singletons slow-selector-2.html	linux1804-64-shippable-qr	e10s fission stylo webrender	0.08 -> 1.43
1700%	perf_reftest_singletons slow-selector-1.html	linux1804-64-shippable-qr	e10s fission stylo webrender	0.08 -> 1.43
1494%	perf_reftest display-none-1.html	linux1804-64-shippable-qr	e10s fission stylo webrender	0.03 -> 0.44
1273%	perf_reftest_singletons only-children-1.html	windows10-64-shippable-qr	e10s fission stylo webrender	0.07 -> 1.01
1253%	perf_reftest_singletons slow-selector-2.html	windows10-64-shippable-qr	e10s fission stylo webrender	0.07 -> 0.94
1242%	perf_reftest_singletons slow-selector-1.html	windows10-64-shippable-qr	e10s fission stylo webrender	0.07 -> 0.94
1241%	perf_reftest_singletons only-children-1.html	macosx1015-64-shippable-qr	e10s fission stylo webrender	0.08 -> 1.06
...	...	...	...	...
18%	perf_reftest_singletons style-sharing.html	macosx1015-64-shippable-qr	e10s fission stylo webrender	4.59 -> 5.41
17%	perf_reftest	linux1804-64-shippable-qr	e10s fission stylo webrender	1.56 -> 1.83
16%	perf_reftest	linux1804-64-shippable-qr	e10s fission stylo webrender	1.57 -> 1.82
12%	perf_reftest some-descendants-1.html	linux1804-64-shippable-qr	e10s fission stylo webrender	4.59 -> 5.16
12%	perf_reftest	linux1804-64-shippable-qr	e10s fission stylo webrender	1.57 -> 1.76

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)
18%	perf_reftest coalesce-2.html	linux1804-64-shippable-qr	e10s fission stylo webrender-sw	30.42 -> 24.91

Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests. Please follow our guide to handling regression bugs and let us know your plans within 3 business days, or the offending patch(es) may be backed out in accordance with our regression policy.

If you need the profiling jobs you can trigger them yourself from treeherder job view or ask a sheriff to do that for you.

For more information on performance sheriffing please see our FAQ.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Set release status flags based on info from the regressing bug 1838200

Comment 2

[Emilio Cobos Álvarez (:emilio)]

Expected, it was a test change. The tests weren't measuring the right thing before.