On Jun 10, 2013, at 08:23 , Jonathan Taylor <jonathan.tay...@glasgow.ac.uk> 
wrote:

> However, if I understand you correctly, you are convinced that the (large) 
> backing buffer for the bitmap data should be being reported by Allocations. 
> As you can hopefully see from these screenshots, while the NS objects 
> themselves are being reported as live, the backing memory itself really 
> doesn't seem to be showing up in Allocations (though the VM tracker knows 
> about it.

It's quite possible that the image files are being mapped into memory, rather 
than being read into allocated buffers. That would produce the results you've 
described (an increase in VM usage, but no big allocation footprint).
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