[Webkit-unassigned] [Bug 90375] Parallel image decoders

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90375


Loïc Yhuel <loic.yhuel at softathome.com> changed:

           What    |Removed                     |Added
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                 CC|                            |loic.yhuel at softathome.com




--- Comment #83 from Loïc Yhuel <loic.yhuel at softathome.com>  2012-08-13 22:36:51 PST ---
(In reply to comment #78)
> >  - If the MemoryCache is under extreme pressure and thrashing, what used to be a performance problem (slower paint operations because allocation/decoding happens each draw operation) will devolve to a kind of nondeterministic behavior (some timing-dependent subset of decoded images -- possibly all images -- are never available at draw time, because the parallel decode work is evicted before it's consumed in the next frame).
> 
> Good question! We fixed Bug 90721 to avoid this problem. After Bug 90721, MemoryCache no longer removes the decoded data of CahcedImage if image will be rendered soon. So the parallel image decoding work is never evicted if clients need to render the image.
> 
So, if I understand correctly, in these cases the number of decoded images in the cache could be a lot higher, so the slow rendering could be replaced by an out of memory error on embedded devices. Perhaps it would be better to disable parallel decoding.

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