Open Bug 614167 Opened 13 years ago Updated 8 months ago

Investigate JS performance on "Prototype - writeAttribute" dromaeo test

Categories

(Core :: JavaScript Engine, defect)

Product:
Core
Component:
JavaScript Engine
Platform:
x86
macOS
Type:
defect

Tracking

()

People

(Reporter: bzbarsky, Unassigned)

References

(Blocks 2 open bugs)

Details

We're slower than the competition, and a profile shows 82% of time at least spent in JS code.  

There's some taking stub calls to deal with DOM getters, lots of SetElem, Arguments, GetElem, NewInitObject, etc stub calls.  FixupArity, TypeOf stubs, NewArray.

And 18% of the time is in mjit-generated code, too.

The Arguments thing us 7% of the time here (mostly the malloc, actually), and shows up in all the Prototype stuff.
Assignee: general → nobody
Severity: normal → S3
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