1953355 - 32.07 - 2.68% damp custom.jsdebugger.reload.DAMP / damp custom.jsdebugger.stepInNewSource.DAMP + 25 more (Linux, OSX, Windows) regression on Wed March 5 2025

Status: RESOLVED WONTFIX

(DevTools :: Debugger, defect)

Description

[Treeherder Bug Filer]

Perfherder has detected a devtools performance regression from push 1589cc01b730d1332357514c8e87444642aba620. 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)
32%	damp custom.jsdebugger.reload.DAMP	macosx1470-64-shippable	e10s fission stylo webrender	666.26 -> 879.89
27%	damp custom.jsdebugger.reload.DAMP	linux1804-64-shippable-qr	e10s fission stylo webrender	748.19 -> 948.15
20%	damp simple.netmonitor.exportHar	windows11-64-shippable-qr	e10s fission stylo webrender	54.13 -> 65.02
18%	damp custom.jsdebugger.project-search.DAMP	linux1804-64-shippable-qr	e10s fission stylo webrender	2,355.40 -> 2,769.90
16%	damp custom.jsdebugger.reload.DAMP	windows11-64-shippable-qr	e10s fission stylo webrender	454.01 -> 526.39
15%	damp simple.netmonitor.exportHar	windows11-64-24h2-shippable	e10s fission stylo webrender	55.73 -> 64.24
15%	damp custom.jsdebugger.reload.DAMP	windows11-64-24h2-shippable	e10s fission stylo webrender	462.53 -> 531.41
12%	damp custom.netmonitor.close.DAMP	windows11-64-shippable-qr	e10s fission stylo webrender	14.41 -> 16.15
11%	damp custom.jsdebugger.project-search.DAMP	macosx1470-64-shippable	e10s fission stylo webrender	2,163.43 -> 2,411.14
11%	damp custom.netmonitor.exportHar	windows11-64-shippable-qr	e10s fission stylo webrender	257.90 -> 285.95
...	...	...	...	...
5%	damp custom.netmonitor.manyrequests.navigate.DAMP	windows11-64-24h2-shippable	e10s fission stylo webrender	548.05 -> 576.76
5%	damp custom.netmonitor.manyrequests.requestsFinished.DAMP	windows11-64-shippable-qr	e10s fission stylo webrender	1,311.34 -> 1,373.31
5%	damp custom.jsdebugger.project-search.DAMP	windows11-64-24h2-shippable	e10s fission stylo webrender	1,519.32 -> 1,587.70
4%	damp custom.netmonitor.manyrequests.requestsFinished.DAMP	windows11-64-24h2-shippable	e10s fission stylo webrender	1,340.55 -> 1,391.77
3%	damp custom.jsdebugger.stepInNewSource.DAMP	linux1804-64-shippable-qr	e10s fission stylo webrender	2,140.05 -> 2,197.31

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)
20%	damp custom.jsdebugger.pause.DAMP	windows11-64-24h2-shippable	e10s fission stylo webrender	375.36 -> 302.11
19%	damp custom.jsdebugger.pause.DAMP	windows11-64-shippable-qr	e10s fission stylo webrender	377.31 -> 306.95
9%	damp custom.jsdebugger.stepInNewSource.DAMP	windows11-64-shippable-qr	e10s fission stylo webrender	958.80 -> 870.64
9%	damp custom.jsdebugger.stepInNewSource.DAMP	windows11-64-24h2-shippable	e10s fission stylo webrender	947.48 -> 861.84

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 all of these tests on try with ./mach try perf --alert 44266

The following documentation link provides more information about this command.

For more information on performance sheriffing please see our FAQ.

If you have any questions, please do not hesitate to reach out to [e-mail].

Comment 1

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

Set release status flags based on info from the regressing bug 1950155

Comment 2

[Holger Benl]

This regression was expected because a big bundle was added to the example app used in the tests.