125952 – REGRESSION(r155201): 13-14% on Dromaeo/jslib-style-prototype and 3-4% on jslib-modify-prototype

Bug 125952 - REGRESSION(r155201): 13-14% on Dromaeo/jslib-style-prototype and 3-4% on jslib-modify-prototype

Summary: REGRESSION(r155201): 13-14% on Dromaeo/jslib-style-prototype and 3-4% on jsli...

Status:	NEW

Alias:	None

Product:	WebKit
Classification:	Unclassified
Component:	JavaScriptCore (show other bugs)
Version:	528+ (Nightly build)
Hardware:	Unspecified Unspecified

Importance:	P2 Normal
Assignee:	Nobody

URL:
Keywords:	InRadar

Depends on:
Blocks:

Reported:	2013-12-18 14:10 PST by Ryosuke Niwa
Modified:	2014-01-07 01:31 PST (History)
CC List:	6 users (show)

See Also:

Attachments
Perf test results (46.26 KB, text/html) 2014-01-07 01:31 PST, Ryosuke Niwa	no flags	Details
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Description Ryosuke Niwa 2013-12-18 14:10:31 PST

https://perf.webkit.org/#mode=charts&chartList=%5B%5B%22mac-lion%22%2C%22Dromaeo%2Fjslib-modify-prototype%3ARuns%22%5D%2C%5B%22mac-mountainlion%22%2C%22Dromaeo%2Fjslib-modify-prototype%3ARuns%22%5D%5D&days=168&zoom=%5B1377934353465.6045%2C1379239368520.3296%5D

WebKit: http://trac.webkit.org/log/?rev=155207&stop_rev=155196&verbose=on

Comment 1 Ryosuke Niwa 2013-12-18 14:20:57 PST

Also regressed Dromaeo/jslib-style-prototype by 12-13%!

https://perf.webkit.org/#mode=charts&chartList=%5B%5B%22mac-mountainlion%22%2C%22Dromaeo%2Fjslib-style-prototype%3ARuns%22%5D%2C%5B%22mac-lion%22%2C%22Dromaeo%2Fjslib-style-prototype%3ARuns%22%5D%5D&days=227&zoom=%5B1377861956112.884%2C1379566406980.915%5D

Comment 2 Radar WebKit Bug Importer 2013-12-20 13:12:53 PST

<rdar://problem/15711024>

Comment 3 Ryosuke Niwa 2014-01-07 01:31:03 PST

Bisected locally. It appears that this regression is caused by http://trac.webkit.org/changeset/155201.

Perhaps one of these tests is encountering a horrible performance cliff the patch talks about.

Comment 4 Ryosuke Niwa 2014-01-07 01:31:24 PST

Created attachment 220501 [details]
Perf test results