Bug 101626

Summary:

Super slow benchmark in V8 (19s) vs JSC (7s)

Product:

WebKit

Reporter:

Elliott Sprehn <esprehn>

Component:

New Bugs

Assignee:

Adam Barth <abarth>

Status:

RESOLVED INVALID

Severity:

Normal

CC:

abarth, burg, haraken, ojan

Priority:

Version:

528+ (Nightly build)

Hardware:

All

OS:

All

Attachments:

Description	Flags
Benchmark	none

Elliott Sprehn

Reported 2012-11-08 11:16:29 PST

Created attachment 173079 [details] 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.

Attachments
Benchmark (1.11 KB, text/html) 2012-11-08 11:16 PST, Elliott Sprehn	no flags	Details
View All Add attachment proposed patch, testcase, etc.

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