Status: New
Owner: ----
New issue 2895 by [email protected]: Gradual degradation of most ICs to
megamorphic state
http://code.google.com/p/v8/issues/detail?id=2895
I've a private-html template script that's running at acceptable speed
(20ms per template run), but after spinning for a couple of minutes it
becomes significantly slower (> 100 ms per template run) and continues to
degrade.
From my investigation I've found that the most of ICs generated for that
template are gradually degarding to N (Megamorphic) state and v8 is
starting to loose time doing global cache lookups in it for every property
read/write operation.
One of the offenders is definitely this guy:
https://chromiumcodereview.appspot.com/18881006, I'm not sure why it was
introduced (probably, because of this assertion:
https://code.google.com/p/v8/source/browse/branches/bleeding_edge/src/objects.cc#10349
), but it makes some of the quite stable monorphic ICs degrade to
megamorphic on cache miss, when they're in fact polymorhpic.
I suppose there're some other reasons behind this, and I'll be glad to help
you with it as much as I can. And unfortunately I've no right to publish
javascript file here, but it was generated using my library:
https://github.com/veged/xjst .
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