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leaking memory in Core Data

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leaking memory in Core Data

Subject: leaking memory in Core Data
From: "John R. Timmer" <email@hidden>
Date: Sat, 10 Nov 2007 21:23:30 -0500

Thanks to the advice of Apple employees who responded to my earlier question, I dramatically reduced my memory use. I am, however, still seeing a very low rate of memory leaks. These are very rare (i found 6 after processing 10K of records), but I'm doing a massive import, and they add up. They occur regardless of whether I'm using manual memory management or garbage collection, and eventually run me out of memory or kill the performance in 64bits.

Using Malloc Debug, i've tracked it down to something that happens after I establish a relationship between two objects, but the leak occurs deep in the Core Data methods that follow. I've pasted in the call stack below, with my methods bolded. The "addHierarchyLeafObject:" method is just the standard one produced by XCode at this point.

I could probably handle importing by spawning a series of child processes, so that the leaks die with the process, but I'd prefer to avoid the hassle. Is there any way to set up a relationship without running into this problem?

Thanks for any advice,

John

STACK Address /1e9ae000/size/0000326c 0x00067ea9 / 0x67ea9 / libMallocDebug.A.dylib 0x913fc444 / PF_ALLOCATE_OBJECT_ARRAY / CoreData 0x9141f6c0 / newFetchedRowsForFetchPlan_MT / CoreData 0x91452ae1 / -[NSSQLCore newFetchedPKsForSourceID:andRelationship:] / CoreData 0x9145258f / -[NSSQLCore retainedRelationshipDataWithSourceID:forRelationship:withContext:] / CoreData 0x914522f7 / -[NSFaultHandler retainedFulfillAggregateFaultForObject:andRelationship:withContext:] / CoreData 0x91429241 / -[_NSFaultingMutableSet willRead] / CoreData 0x9142c037 / -[_NSFaultingMutableSet count] / CoreData 0x9141003c / -[NSManagedObject(_NSInternalMethods) _newPropertiesForRetainedTypes:andCopiedTypes:preserveFaults:] / CoreData 0x9140fd70 / -[NSManagedObject(_NSInternalMethods) _allProperties] / CoreData 0x9140fc64 / -[NSManagedObjectContext(_NSInternalChangeProcessing) _establishEventSnapshotsForObject:] / CoreData 0x91413036 / _PFFastMOCObjectWillChange / CoreData 0x91443a53 / -[NSManagedObject willChangeValueForKey:withSetMutation:usingObjects:] / CoreData 0x000087ad / -[jt_HierarchyObject addHierarchyLeafObject:] / ImportApp 0x91451434 / -[NSManagedObject(_NSInternalMethods) _includeObject:intoPropertyWithKey:andIndex:] / CoreData 0x914128b1 / -[NSManagedObject(_NSInternalMethods) _didChangeValue:forRelationship:named:withInverse:] / CoreData 0x925e6f8e / NSKVONotify / Foundation 0x925639c2 / -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] / Foundation 0x914125c7 / -[NSManagedObject didChangeValueForKey:] / CoreData 0x000081d5 / -[jt_ThreadedImport createHierarchy] / ImportApp 0x9256704d / -[NSThread main] / Foundation 0x92566bf4 / __NSThread__main__ / Foundation 0x96b82075 / _pthread_start / libSystem.B.dylib 0x96b81f32 / thread_start / libSystem.B.dylib ENDSTACK _______________________________________________

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