1987453 - 5.75 - 3.14% compiler_metrics num_static_constructors / compiler_metrics num_static_constructors + 6 more (Linux, OSX, Windows) regression on Thu September 4 2025

Status: RESOLVED FIXED

(Core :: Machine Learning: General, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a build_metrics performance regression from push 4c630ff1b3255fb7e6cb13eb8018652aa6703bef. As author of one of the patches included in that push, we need your help to address this regression.

Please acknowledge, and begin investigating this alert within 3 business days, or the patch(es) may be backed out in accordance with our regression policy. Our guide to handling regression bugs has information about how you can proceed with this investigation.

If you have any questions or need any help with the investigation, please reach out to [e-mail]. Alternatively, you can find help on Slack by joining #perf-help, and on Matrix you can find help by joining #perftest.

Regressions:

Ratio	Test	Platform	Options	Absolute values (old vs new)
6%	compiler_metrics num_static_constructors	osx-cross		87.00 -> 92.00
5%	compiler_metrics num_static_constructors	osx-cross		91.00 -> 96.00
5%	compiler_metrics num_static_constructors	windows2012-64		94.00 -> 99.00
5%	compiler_metrics num_static_constructors	windows2012-32		108.00 -> 113.00
4%	compiler_metrics num_static_constructors	linux64		102.00 -> 106.00
4%	compiler_metrics num_static_constructors	linux64		106.00 -> 110.00
3%	compiler_metrics num_static_constructors	windows2012-64		148.00 -> 153.00
3%	compiler_metrics num_static_constructors	windows2012-32		159.00 -> 164.00

Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests.

You can run all of these tests on try with ./mach try perf --alert 46597

The following documentation link provides more information about this command.

Comment 1

[Paul Adenot (:padenot)]

Will be fixed by https://bugzilla.mozilla.org/show_bug.cgi?id=1987107 (up for review), closing this.

Comment 2

[Mathew Hodson]

Perf alert was posted in bug 1986900 showing improvement.

(In reply to Alex Finder from bug 1986900 comment #21)

Perfherder has detected a build_metrics performance change from push 09242258e16ef379e696a42afecf69f23ea84fac.

If you have any questions, please reach out to a performance sheriff. Alternatively, you can find help on Slack by joining #perf-help, and on Matrix you can find help by joining #perftest.

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)
4%	compiler_metrics num_static_constructors	osx-cross		96.00 -> 92.00
4%	compiler_metrics num_static_constructors	linux64		106.00 -> 102.00
4%	compiler_metrics num_static_constructors	linux64-shippable		106.00 -> 102.00
4%	compiler_metrics num_static_constructors	linux64		110.00 -> 106.00
4%	compiler_metrics num_static_constructors	linux64-shippable	instrumented	112.00 -> 108.00

Details of the alert can be found in the alert summary, including links to graphs and comparisons for each of the affected tests.

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

You can run all of these tests on try with ./mach try perf --alert 46614

The following documentation link provides more information about this command.

Comment 3

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

Set release status flags based on info from the regressing bug 1971158