1878232 - 7.25 - 7.23% tsvgr_opacity / tsvgr_opacity (Windows) regression on Mon January 22 2024

Status: RESOLVED WONTFIX

(Core :: JavaScript: GC, defect)

Description

[Acasandrei Beatrice (needinfo me)]

Perfherder has detected a talos performance regression from push 1051cef25fba4f064b92281391261435d89809e5. 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)
7%	tsvgr_opacity	windows10-64-shippable-qr	e10s fission stylo webrender-sw	55.00 -> 58.99
7%	tsvgr_opacity	windows10-64-shippable-qr	e10s fission stylo webrender-sw	54.50 -> 58.44

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)
55%	tp5o responsiveness	windows10-64-shippable-qr	e10s fission stylo webrender	0.93 -> 0.42
54%	tp5o responsiveness	windows10-64-shippable-qr	e10s fission stylo webrender-sw	0.90 -> 0.42
42%	tp5o_webext responsiveness	windows10-64-shippable-qr	e10s fission stylo webrender	1.52 -> 0.89
35%	tp5o_webext responsiveness	windows10-64-shippable-qr	e10s fission stylo webrender-sw	1.48 -> 0.96
21%	tp5o_webext responsiveness	linux1804-64-shippable-qr	e10s fission stylo webrender-sw	2.87 -> 2.28
20%	tp5o_webext responsiveness	linux1804-64-shippable-qr	e10s fission stylo webrender	3.14 -> 2.51

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 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.

You can run these tests on try with ./mach try perf --alert 41207

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 1875117

Comment 2

[Jon Coppeard (:jonco)]

I couldn't see anything problematic looking at profiles for the tsvgr_opacity test. This is probably a case of a GC running with different timing due to the changes.

Closing this as WONTFIX given the overall improvements from bug 1875117 both in this bug and in general.