Open
Bug 1703470
Opened 4 years ago
Updated 4 years ago
Consider adding a cache for GetterSetter instances
Categories
(Core :: JavaScript Engine, task, P3)
Core
JavaScript Engine
Tracking
()
NEW
People
(Reporter: jandem, Unassigned)
References
Details
Since bug 1700052 we store getter/setter objects as a GetterSetter tuple. We should measure how common it is to create duplicate GetterSetter instances; a full hash map may not be worth the perf/memory overhead, but maybe a 1-slot (or few slots) cache could pay off for the case where the same accessor property is defined on multiple objects (or on the same object with different property keys).
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Reporter | |
Comment 1•4 years ago
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I did some quick measurements. Loading a number of popular websites, out of 205,000+ GetterSetters we created, only a handful are identical to one created recently. More than 97% of them are unique.
This is based on comparing JSObject* pointers so not entirely correct due to (moving) GC, but it's probably a close enough estimate.
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Description
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