Comment #2 on issue 2699 by [email protected]: WeakMaps cause long
GC pauses
http://code.google.com/p/v8/issues/detail?id=2699
After investigating this issue further I found the root cause for the long
pauses. It wasn't marking of entries but excessive processing of the
WeakMaps itself that lead to many (about 30-ish) ~100ms pauses. By only
triggering processing of WeakMaps twice during marking the pause went down
to just twice ~100ms. This still isn't great, but an order of magnitude
better than before. The fix is in flight.
Note that the processing of WeakMaps itself is still implemented as a
fix-point iteration with quadratic worst-case time. But for this and
similar use-cases (including the internal usage in Object.observe) this
worst-case cannot trigger.
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