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Re: Core Data performance (was: Newbie Help understanding Core Data)

On Jul 28, 2005, at 12:55 PM, Charilaos Skiadas wrote:
So again my question, and that's really my final question on this, has anyone (maybe Apple?) done measurements to compare a generic Core Data app versus the corresponding app in a non-Core Data way, and compared the runtime performance of the two?

We did exactly that throughout the development of Core Data and the team continues to carefully monitor performance numbers throughout development. There are certainly still opportunities for optimization.

As per storage, NSManagedObject uses an internal storage mechanism for data that is highly optimized. In particular, it leverages the knowledge about the types to be stored that are available via introspecting the model. For storage and retrieval of data, including KVO and KVC interactions, using NSManagedObject will very likely be faster than any storage mechanism including the simple getter/setter case.

Given that a modern Cocoa application will be implemented with heavy use of bindings and bindings makes heavy use -- is entirely reliant upon -- KVO and KVC, it would be very difficult to build a raw data storage mechanism that provides the same level of efficiency as Core Data while also driving a Cocoa Bindings heavy UI.

Now, to address the question "for simple data, what is the point of Core Data?". Even a simple application will likely need undo, redo, validation, relationships between objects, and the ability to save. Core Data gives you all of that for free.

b.bum
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References: 
 >Newbie Help understanding Core Data (From: Vince Ackerman <email@hidden>)
 >Re: Newbie Help understanding Core Data (From: Charilaos Skiadas <email@hidden>)
 >Re: Newbie Help understanding Core Data (From: SA Dev <email@hidden>)
 >Re: Newbie Help understanding Core Data (From: Charilaos Skiadas <email@hidden>)
 >Re: Newbie Help understanding Core Data (From: SA Dev <email@hidden>)
 >Core Data performance (was: Newbie Help understanding Core Data) (From: Charilaos Skiadas <email@hidden>)



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