1907544 - 2.16% speedometer VanillaJS-TodoMVC/CompletingAllItems/Async (OSX) regression on Wed July 3 2024

Status: RESOLVED WONTFIX

(Core :: Memory Allocator, defect)

Description

[Acasandrei Beatrice (needinfo me)]

Perfherder has detected a browsertime performance regression from push f76dc442b4809fbe77e1a6eb5c5f1e87313d27b9.

Regressions:

Ratio	Test	Platform	Options	Absolute values (old vs new)	Performance Profiles
4%	speedometer React-TodoMVC/CompletingAllItems/Async	linux1804-64-nightlyasrelease-qr	fission webrender	2.73 -> 2.85	Before/After
4%	speedometer EmberJS-TodoMVC/CompletingAllItems/Async	linux1804-64-nightlyasrelease-qr	fission webrender	2.88 -> 2.99	Before/After
3%	speedometer VanillaJS-TodoMVC/CompletingAllItems/Async	linux1804-64-nightlyasrelease-qr	fission webrender	2.25 -> 2.33	Before/After
3%	speedometer Angular2-TypeScript-TodoMVC/CompletingAllItems/Async	linux1804-64-nightlyasrelease-qr	fission webrender	2.04 -> 2.11	Before/After
3%	speedometer Vanilla-ES2015-Babel-Webpack-TodoMVC/CompletingAllItems/Async	linux1804-64-nightlyasrelease-qr	fission webrender	2.76 -> 2.85	Before/After
3%	speedometer Vanilla-ES2015-TodoMVC/CompletingAllItems/Async	linux1804-64-nightlyasrelease-qr	fission webrender	2.74 -> 2.83	Before/After
3%	speedometer Elm-TodoMVC/CompletingAllItems/Async	linux1804-64-nightlyasrelease-qr	fission webrender	3.09 -> 3.17	Before/After
2%	speedometer Flight-TodoMVC/DeletingItems/Sync	macosx1015-64-nightlyasrelease-qr	fission webrender	26.46 -> 27.07	Before/After
2%	speedometer Flight-TodoMVC/DeletingItems	macosx1015-64-nightlyasrelease-qr	fission webrender	27.03 -> 27.65	Before/After
2%	speedometer Elm-TodoMVC/CompletingAllItems/Async	macosx1015-64-nightlyasrelease-qr	fission webrender	2.47 -> 2.53	Before/After
2%	speedometer VanillaJS-TodoMVC/CompletingAllItems/Async	macosx1015-64-nightlyasrelease-qr	fission webrender	1.78 -> 1.82	Before/After
2%	speedometer3 NewsSite-Nuxt/total	macosx1015-64-nightlyasrelease-qr	fission webrender	184.71 -> 188.59	Before/After

As author of one of the patches included in that push, we need your help to address this regression.
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 these tests on try with ./mach try perf --alert 1058

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 1905805

Comment 2

[Paul Bone [:pbone]]

We knew this would happen, nevertheless I want to let people know because we might decide to adjust PHC's parameters.

Comment 3

[Christian Holler (:decoder)]

PHC is expected to have a certain performance cost. We've been running experiments for quite some time with guardrail metrics being okay, this is just the deployment to all of the population.

Comment 4

[Donal Meehan [:dmeehan]]

:pbone is this a wontfix for Fx129?

Comment 5

[Paul Bone [:pbone]]

Yeah, WONTFIX. Thanks decoder for pointing out the guardrail metrics were unaffected.