Long load time of managed object context
Long load time of managed object context
- Subject: Long load time of managed object context
- From: Matteo Manferdini <email@hidden>
- Date: Fri, 16 Jan 2009 13:03:24 +0100
Hi everyone,
I'm testing performance in my application, to see how it behaves with
a big load of data inside of it. My application is core data based and
uses array controllers in entity mode to fetch data.
What I discovered is that my app fetched all the managed objects
present in core data, so I set the fetch predicate of array
controllers at startup. This reduced dramatically the number of
objects fetched. The problem though is that my app still takes a lot
of time to start when is full of data.
I ran the app within instruments, and the core data fetches instrument
confirms that this is not the problem (my app fetches only 20-30
objects when starts). But running it under Shark I can see that for
4-5 seconds after startup the only call on the stack is to the app
managed object context. So I think it has something to do with
interaction between managed object context and data stored, even if I
don't fetch all the data. If I empty the app or leave little data
inside of it, it starts very quickly.
Does somebody know why this happens? Am I missing something obvious?
Why does it take so much to the managed object context to load if I
only fetch few objects? I always read that core data scales well and
the programming guide states that 10.000 objects are not much for core
data, but in my app it makes a big difference, so I'm wondering where
I am wrong.
Thank you very much.
Cheers.
Matteo Manferdini
Pawn Software
www.pawn-soft.com
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