CoreData huge memory usage - is this right ?
CoreData huge memory usage - is this right ?
- Subject: CoreData huge memory usage - is this right ?
- From: Martin Linklater <email@hidden>
- Date: Fri, 14 Dec 2007 06:38:19 -0800
Hi - I'm in the process of writing code which will create and populate a CoreData SQLite store. I have a few million objects to deal with. I have written code which imports a text description of my data and then iterates through inserting and setting attributes of my CoreData objects. Things are going fine with the exception of one problem I am having... I am seeing CoreData take huge amounts of RAM to do it's thing. When my SQLite store is at around 10MB in size, my task is taking upwards of 500+MB of memory.
I have run my application through 'Instruments' and the major culprit for all this memory usage is CoreData - namely the 'GeneralBlock-x' where x is a number. I am trying to track down this memory leak but I'm stuck as to where it is coming from. My code follows the standard template XCode code for a CoreData Application, and I am simply iterating through my object like this:
while( not end of file )
{
id coreDataElement = [NSEntityDescription insertNewObjectForEntityForName:name in ManagedObjectContext:moc];
// add my attributes for the element
[coreDataElement setValue:value forKey:key];
[coreDataElement setValue:value forKey:key];
[coreDataElement setValue:value forKey:key];
etc.
[coreDataElement release];
// then every 1000 entries or so I am saving the context
[moc save:&error];
}
This code is executing fine, and my elements are indeed being inserted into the CoreData store because I have ran this code with an XML store and things are being stored fine. Saving of the moc is returning with no errors too.
So I am stumped as to why CoreData is allocating an awful lot of memory for this task... can anyone shed some light on what I'm doing wrong ?
Apologies if this is a trivial error - I am very new to CoreData.
Thank you.
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