Status: Accepted
Owner: [email protected]
CC: [email protected], [email protected]
Labels: Type-Bug Priority-Medium OS-All
New issue 3665 by [email protected]: Allocation site pretenuring degrades
performance in Ember
https://code.google.com/p/v8/issues/detail?id=3665
v8:3664 tracks deoptimizations caused by weak references. With disabled
weak references, allocation site pretenuring is the next common cause of
deoptimization.
"Complex List" test at
http://samsaffron.github.io/ember-performance/?ember=1.8.0 runs
- 185.11ms without weak references, with allocation site pretenuring
(--js-flags="--noweak-embedded-objects-in-optimized-code
--noweak-embedded-maps-in-optimized-code")
- 169.57ms without weak references and without allocation site pretenuring
(--js-flags="--noweak-embedded-objects-in-optimized-code
--noweak-embedded-maps-in-optimized-code --noallocation-site-pretenuring")
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