RESOLVED WONTFIX20814
V8 tests spend fair amount of time in property lookup cache misses 
https://bugs.webkit.org/show_bug.cgi?id=20814
Summary V8 tests spend fair amount of time in property lookup cache misses
Maciej Stachowiak
Reported 2008-09-12 16:20:25 PDT
A number of the V8 tests spend significant time in cti_op_get_by_id_generic, indicating misses of the polymorphic inline cache. Some of the causes include: - Math object properties being accessed in a pattern that makes the structure ID change (since the function properties are created on demand). We might want to pre-populate all at once, perhaps, or at least prebuild the structure ID and leave "placeholder" values of some kind. - Legitimate polymorphism, which we could handle either by making the generic case faster, or by making the polymorphic inline cache truly polymorphic up to some limit. - Unknown causes perhaps due to bugs in our cache logic. This most heavily affects DeltaBlue (to the tune of 23.2%) but Richards (6.4%), Raytrace (3.2%), and Crypto(1.9%) are also somewhat affected. See bug 20813 for profiles.
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Gavin Barraclough
Comment 1 2012-03-07 00:05:10 PST
*** Bug 20813 has been marked as a duplicate of this bug. ***
Gavin Barraclough
Comment 2 2012-09-23 16:31:33 PDT
Our caching has improved a lot in the last 4 years, I don't think this bug is still tracking useful work (which is not to say our caching in v8 is perfect yet!).
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