Documentation on Heap snapshot in observatory

[Alan Frye]

I am looking for some documentation that explains the items on the heap snapshot screen, to make sure I understand what I am seeing. I found a page on the Allocation Profile but not the heap snapshot. 

[John Mccutchan]

+Ryan Macnak can help here.

John

On Wed, Nov 9, 2016 at 7:47 AM Alan Frye <alf...@gmail.com> wrote:

I am looking for some documentation that explains the items on the heap snapshot screen, to make sure I understand what I am seeing. I found a page on the Allocation Profile but not the heap snapshot. 

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[Alan Frye]

Thanks John! 

I am trying to understand the difference in incoming and outgoing references

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[Ryan Macnak]

The heap snapshot shows a dominator tree and a summary of references by class. For the dominator tree, you might find the documentation on the equivalent tool in DevTools helpful. For the reference summary, consider the heap of the following program

class A { var x; }

class B { var x; }

class C { }

var a = new A();

var b = new B();

var c = new C();

a.x = b;

b.x = c;

if we look in the summary at class B, it would say there is 1 instance of B, with 1 incoming reference from an A and 1 outgoing reference to a C.

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