1826106 - Update the Stencil API usage in the Utility Process to avoid JSContext

Status: RESOLVED FIXED

(Core :: DOM: Core & HTML, task)

Comment 1

[Tooru Fujisawa [:arai]]

Attachment: Bug 1826106 - Use JS::FrontendContext in Utility Process. r?sefeng!

Depends on D179429

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/b2a1e760b231
Use JS::FrontendContext in Utility Process. r=sefeng

Comment 3

[Iulian Moraru]

https://hg.mozilla.org/mozilla-central/rev/b2a1e760b231

Comment 4

[Acasandrei Beatrice (needinfo me)]

Perfherder has detected an awsy performance improvement from push b2a1e760b23149650ac1c047f6529cbeae6deefe.
One of Bug 1826106, Bug 1826105, Bug 1834478 is causing this improvement. As author of the patches could you provide some input on which one of the bugs might be causing the improvement? Thanks.

Comment 5

[Tooru Fujisawa [:arai]]

It should be mostly from this bug's patch.

• Bug 1834478 patch is just a preparation
• Bug 1826105 patch can reduce the memory consumption which is caused by objects corresponds to JS object temporarily allocated when the input matches JSON, but the effect would be very limited and only temporarily
• Bug 1826106 patch reduces the memory consumption by skipping the initialization of most part of the JS engine runtime (self-hosting, global, gc, and possibly threads). now the utility process uses light-weight version of the JS API, and this should be most impactful.

Comment 6

[Acasandrei Beatrice (needinfo me)]

(In reply to Pulsebot from comment #2)

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/b2a1e760b231
Use JS::FrontendContext in Utility Process. r=sefeng

== Change summary for alert #38681 (as of Wed, 14 Jun 2023 08:07:56 GMT) ==

Improvements:

Ratio	Test	Platform	Options	Absolute values (old vs new)
4%	Heap Unclassified	windows11-64-2009-shippable-qr	fission tp6	96,772,363.98 -> 92,870,616.80
3%	Heap Unclassified	windows11-64-2009-shippable-qr	fission tp6	96,691,348.27 -> 93,336,106.99

For up to date results, see: https://treeherder.mozilla.org/perfherder/alerts?id=38681