Status: New
Owner: ----
New issue 2567 by [email protected]: v8 per-document boot-up is
extremely slow
http://code.google.com/p/v8/issues/detail?id=2567
v8 per-document boot-up is extremely slow
I wrote a benchmark which just adds an iframe to the DOM repeatedly:
https://bugs.webkit.org/show_bug.cgi?id=111389#c5
It can do about 70 iframes per second on my (super fast) 32core Z620. In
Debug mode it only gets 4.5 iframes per second.
If you sample the benchmark (using --profile, as detailed in the link
above), all the samples are under v8.
This slow per-document-boot is has caused us to abandon threaded-parser
testing in Debug builds:
https://bugs.webkit.org/show_bug.cgi?id=110876
So I guess there are 2 bugs here. One that Release builds take 14.5ms
(nearly a full frame) to setup an iframe (all in v8), and second that it's
about 14x slower to do so in Debug builds. :)
I'm told by Dan Carney that this is a known issue, but I didn't see a
related bug in my brief searching. Feel free to dup/close/whatever as you
see fit. Hopefully this information is helpful.
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