Source of CFData (store) allocation at app start

Question

At app start, my Cocoa app instantly creates two CFData objects. One of size 34 MB and another of size 57 MB. I cannot seem to figure out what these objects are or where they are coming from within Instruments.

Both are allocated before applicationWillFinishLaunching completes.

I have tried clearing NSURLCache as well as clearing my Kingfisher image cache and am open to other ideas for cleaning out this data. How can I find the source of these allocations?

I think Instruments can tell you the stack trace of an allocation? — tbodt, Jul 11 '16 at 03:30
@tbodt I imagine so, but not sure which subtool or pathway to use. — Andrew Schreiber, Jul 12 '16 at 04:59
http://stackoverflow.com/questions/8412607/how-do-you-see-the-specific-methods-responsible-for-memory-allocation-in-xcode-i — tbodt, Jul 12 '16 at 16:53

score 0 · Accepted Answer · edited May 23 '17 at 12:33

The issue turned out to be caused by NSUserDefaults. Earlier in development, I had saved some large files there, which were never deleted.

Here is what the Instruments call tree revealed.

From there I tried using

NSUserDefaults.resetStandardUserDefaults()

But that did nothing. Nor did cleaning my project or deleting the Derived Data folder manually.

Following this answer brought my CFData allocation to zero: Clearing NSUserDefaults

Source of CFData (store) allocation at app start

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