https://bugzilla.wikimedia.org/show_bug.cgi?id=72933
Bug ID: 72933
Summary: v8 warns it won't optimize oo.Factory.create or
oo.EventEmitter.emit
Product: OOjs
Version: unspecified
Hardware: All
OS: All
Status: NEW
Keywords: performance
Severity: normal
Priority: Unprioritized
Component: General
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Web browser: ---
Mobile Platform: ---
To reproduce:
- Navigate to an article
- Open Chrome's Developer Tools
- Click 'Profiles'
- Select 'Collect JavaScript CPU Profile'
- Click 'Start'
- Click 'Edit [beta]'
- Wait for VisualEditor to finish loading
- Click 'Stop'
Result:
Both oo.Factory.create or oo.EventEmitter.emit are flagged by the profiler with
the warning: "Not optimized: Inlining bailed out."
To investigate, I recommend reading
<https://github.com/GoogleChrome/devtools-docs/issues/53>
v8 comes with a 'd8' executable that can be used for getting some performance
debug info from v8. If you can craft a file that utilizes these functions
without depending on the DOM API, you can try running it with:
> d8 --trace-opt --trace-bailout some-js-file.js
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