1985806 - 3.85 - 3.01% Base Content Heap Unclassified / Base Content Heap Unclassified (Linux, Windows) regression on Sat August 23 2025

Status: RESOLVED FIXED

(Core :: Machine Learning: General, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a awsy performance regression from push 347c59ae0bce3cde618bb738c6e630896f22cf8a. 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)
4%	Base Content Heap Unclassified	windows11-64-24h2-shippable	fission	2,031,929.00 -> 2,110,215.33
3%	Base Content Heap Unclassified	linux1804-64-shippable-qr	fission	2,486,187.00 -> 2,561,002.00

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 [e-mail] to do that for you.

You can run all of these tests on try with ./mach try perf --alert 46469

The following documentation link provides more information about this command.

Comment 1

[Florin Bilt]

Already backed out, feel free to close as fixed

Perfherder has detected a awsy performance change from push 4efe072f5aa1c69de8158337d9cddbaf7ec3ae05.

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%	Base Content Heap Unclassified	windows11-64-24h2-shippable	fission	2,126,249.33 -> 2,039,947.33
3%	Base Content Heap Unclassified	linux1804-64-shippable-qr	fission	2,576,719.67 -> 2,493,361.67

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 46509

The following documentation link provides more information about this command.

Comment 2

[Paul Adenot (:padenot)]

This has been backed out.

Comment 3

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

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