[Webkit-unassigned] [Bug 29323] canvas demo stutters half way through

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=29323





--- Comment #3 from Eric Seidel <eric at webkit.org>  2009-09-17 01:01:03 PDT ---
The big white blobs right after the swirly colored dots (rather early in the
demo).

I found resizing the window while the demo was going made it obvious when it
started to stutter.

I was testing in a Safari 4.0.3 release build, so symbols are mostly missing. 
It seems it was spending most of its time in JSObject::mark() according to
Shark heavy view:

    25.7%    25.7%    JavaScriptCore    JSC::JSObject::mark()    
    12.0%    12.0%    JavaScriptCore    JSC::JSArray::mark()    
    9.9%    9.9%    JavaScriptCore    JSC::JSFunction::mark()    
    6.0%    6.0%    JavaScriptCore    JSC::CodeBlock::mark()    
    5.6%    5.6%    JavaScriptCore    unsigned long
JSC::Heap::sweep<(JSC::HeapType)0>()    
    3.3%    3.3%    JavaScriptCore    JSC::JSActivation::mark()    
    3.1%    3.1%    JavaScriptCore    JSC::JSStaticScopeObject::mark()    

Still working on getting you a better sample.

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