Re: NSMutableArray performance
Re: NSMutableArray performance
- Subject: Re: NSMutableArray performance
- From: David Remahl <email@hidden>
- Date: Tue, 08 Oct 2002 00:38:19 +0200
>
Hello,
>
>
I decided to rewrite my old C++ application in full Objective-C.
>
This application used extensively arrays of double values and makes
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many computations.
>
I decided to replace all my arrays by NSMutableArray and all becomes
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very slow.
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The sequence execution between the C++ and Objective-C is the same
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(executing the code in debug mode, step by step), so i can
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think there is no dead code.
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The mutable arrays can contain between 1 and 3 double value objects
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only but
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my programm makes lots of such thing :
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>
double aValueToCompute = [[myArray objectAtIndex:index] doubleValue] *
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[[theSecondArray objectAtIndex:index] doubleValue];
>
>
Is there somewhere a topic about NSMutableArray performances ?
>
Should i stay with simple C array ?
Maybe. But there are several performance enhancing measures you can try
before you decide to take that route.
There is a very good article series about optimizing foundation (and Cocoa
in general) here:
<
http://www.mulle-kybernetik.com/artikel/Optimization/opti.html>
/ Rgds, David
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