1743133 - 7.86 - 7.59% Heap Unclassified / Heap Unclassified (OSX) regression when Firefox is built with the macOS 11 SDK

Status: RESOLVED WONTFIX

(Core :: Widget: Cocoa, defect, P2)

Description

[Andrej (:aglavic)]

Perfherder has detected a awsy performance regression from push 572b175efb0960eb15cc814d9c8f8f65afecae52. 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)
8%	Heap Unclassified	macosx1015-64-shippable-qr	tp6	125,319,213.79 -> 135,166,190.05
8%	Heap Unclassified	macosx1015-64-shippable-qr	tp6	126,854,827.82 -> 136,487,417.50

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) will be backed out in accordance with our regression policy.

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 1696504

Comment 2

[Alexandru Ionescu (needinfo me) [:alexandrui]]

== Change summary for alert #32530 (as of Sun, 28 Nov 2021 06:09:40 GMT) ==

Regressions:

Ratio	Test	Platform	Options	Absolute values (old vs new)
4%	amazon PerceptualSpeedIndex	macosx1015-64-shippable-qr	cold fission webrender	518.62 -> 541.00
4%	amazon ContentfulSpeedIndex	macosx1015-64-shippable-qr	cold fission webrender	518.21 -> 540.25

For up to date results, see: https://treeherder.mozilla.org/perfherder/alerts?id=32530

Comment 3

[Markus Stange [:mstange]]

This is likely due to different font memory management done by macOS system libraries. We probably can't do much about it.