Open Bug 614167 Opened 11 years ago Updated 7 years ago

Investigate JS performance on "Prototype - writeAttribute" dromaeo test

Categories

(Core :: JavaScript Engine, defect)

x86
macOS
defect
Not set
normal

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
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