[Webkit-unassigned] [Bug 101626] New: Super slow benchmark in V8 vs JSC

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=101626

           Summary: Super slow benchmark in V8 vs JSC
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: esprehn at chromium.org
                CC: abarth at webkit.org, haraken at chromium.org


Created an attachment (id=173079)
 --> (https://bugs.webkit.org/attachment.cgi?id=173079&action=review)
Benchmark

This page takes 7 seconds in Safari, but 19 seconds in Chrome. In doing a trace it seems we spend all our time in V8 bindings, seemingly in GC. A trace of Safari shows they spend a lot of time in WebCore::JSNodeOwner::isReachableFromOpaqueRoots as well.

Webkit.app nightly: 7571 ms
Chrome Canary Chrome/25.0.1320.0 (WebKit 133816): 18620 ms

This case is probably pathological because Firefox 17 takes 35 seconds and Opera never finishes loading. I don't have IE10 on hand to test there.

The origin of this benchmark is Bug 73853.

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