1989548 - 0.3 - 0.25% installer size / installer size + 1 more (Windows) regression on Thu September 11 2025

Status: RESOLVED WONTFIX

(Core :: Machine Learning: General, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a build_metrics performance regression from push a4eef4031ec956cf1a0c747a27d281c7846ba0ae. 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)
0.30%	installer size	windows2012-32-shippable	nightly	108,487,711.58 -> 108,811,362.25
0.26%	installer size	win64-nightlyasrelease	nightly nightly-as-release	124,285,626.42 -> 124,613,696.67
0.25%	installer size	windows2012-64-shippable	nightly	126,877,131.25 -> 127,188,716.58

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 46798

The following documentation link provides more information about this command.

Comment 1

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

Set release status flags based on info from the regressing bug 1987107

Comment 2

[Paul Adenot (:padenot)]

This is very much expected, thanks for flagging though.