[Webkit-unassigned] [Bug 106127] [meta] HTML parser shouldn't block the main thread

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=106127





--- Comment #13 from Tony Gentilcore <tonyg at chromium.org>  2013-01-24 11:53:59 PST ---
I ran the prototype through the top 25 suite in Telemetry on a Galaxy Nexus (with the exception of Calendar which didn't load with the threaded parser). This benchmark loads cached sites from a local web page replay instance.

Results are preliminary but encouraging:

                  Default  Threaded  Improvement
DOMContentLoaded     4972      4304          13%
ParseHTML total       702       593          14%
ParseHTML avg           9         5          44%
ParseHTML max         309       107          65%

Full results:
https://docs.google.com/a/chromium.org/spreadsheet/ccc?key=0AmVDuVhIZxCTdGdLUlhkbnVUaDlCQ01uVm92S05saHc#gid=0

One suspicious thing is that the absolute value of DOMContentLoaded improved more than ParseHTML. Perhaps due to our doc.write bug, we are actually doing less work on some of the pages. I'm also a little surprised the ParseHTML numbers didn't improve more. That suggests tree building is still taking a fair amount of time.

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