[Webkit-unassigned] [Bug 111617] New: Robohornet Pro's Resize Columns test spends 40% of its time in WebCore::AnimationController::getAnimatedStyleForRenderer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=111617

           Summary: Robohornet Pro's Resize Columns test spends 40% of its
                    time in
                    WebCore::AnimationController::getAnimatedStyleForRende
                    rer
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: http://ie.microsoft.com/testdrive/performance/robohorn
                    etpro/
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ajuma at chromium.org
                CC: eric at webkit.org, vollick at chromium.org


Robohornet Pro's Resize Columns test (which involves repeatedly forcing layout by calling offsetTop) spends 40% of its time in WebCore::AnimationController::getAnimatedStyleForRenderer (this also accounts for about 18% of the time for the entire set of Robhornet Pro tests); 2/3 of this is spent in PropertyWrapperAcceleratedTransform::blend. This is on the Mac port.

A call to getAnimatedStyleForRenderer is made in RenderLayer::currentTransform only when we're running an accelerated transform. As an interesting consequence, disabling accelerated animations (by skipping the calls to addAnimation in RenderLayerBacking::startAnimation) significantly reduces the total time for Robohornet Pro on the Mac port (on my machine, it takes about 5.8 s with accelerated animations, and about 4.4 s with non-accelerated animations), though the animations of course get choppy. 

For the same reason, the chromium port hits a 16% regression in Robohornet Pro (e.g. http://crbug.com/178419) when it accelerates all animations (instead of the present state, where the chromium port only accelerates animations that are added to GraphicsLayers already in the layer tree).

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.