Is there a package to list memory consumption of selected data objects?

General Usage
15

This also has overhead, more than the Tuple example it seems:

julia> function f()
         x = 1
         @show_locals
       end
f (generic function with 1 method)

julia> f()

Individual sizes (does not account for overlap):
	x: 8 bytes
Joint size: 472 bytes

It’s negligible when your instances are large enough to take up most of the reported memory, like your example with a 100x100 matrix, but that’s not always the case. I’m not sure if there is a way to separate the memory of the values iterator and the referenced @locals dictionary from the memory of the contained instances, though. sizeof(locals) is a constant for any size, so probably have to dig into some internals.

@locals makes a Dict{Symbol, Any}, so it would involve how those instances are boxed. Hypothetically the boxes on the heap could just point to the existing instances, but I don’t actually know how boxes are implemented; as far as I know, copying could happen for many immutables. In any case, @locals or any other container would only contain 1 of the copies, so summarysize wouldn’t count twice.

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