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Cocoa application running very slow under 64 bit

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Cocoa application running very slow under 64 bit

Subject: Cocoa application running very slow under 64 bit
From: Frank Illenberger <email@hidden>
Date: Thu, 11 Sep 2008 10:44:11 +0200

Hi there,

I migrated an existing cocoa application to run under x86_64 with Xcode 3.1 / Mac OS 10.5.4. The app still runs fine under 32 bit but when started in x86_64 mode, it runs about 3-4 times slower. A shark profile reveals the following hot traces:

8.9% libgcc_s.1.dylib _Unwind_GetIPInfo 7.6% libgcc_s.1.dylib _Unwind_GetIPInfo 7.6% libgcc_s.1.dylib _Unwind_Backtrace 7.6% libobjc.A.dylib objc_addExceptionHandler 7.5% Unknown Library _CFDoExceptionOperation 7.2% Unknown Library _NSAppKitLock 1.5% Unknown Library -[NSView nextKeyView] 1.2% Unknown Library -[NSView _primitiveSetNextKeyView:] 0.8% Unknown Library +[NSControl cellClass] [unknown] 0.7% Unknown Library -[NSCell setMnemonicLocation:] 0.6% Unknown Library SetPlaceholderString 0.5% Unknown Library -[NSView previousKeyView] 0.2% Unknown Library -[NSControl _setControlTextDelegateFromOld:toNew:]

These hot traces do not show up when I profile the app running under 32 bit.

Does anybody know why a 64 bit app could be spending so much time in these methods?

Cheers

Frank

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