Master Thesis on Shenandoah

[Aleksey Shipilev]

On 10/24/2017 02:43 PM, Andrew Haley wrote:
> On 18/10/17 21:32, Dominik Inführ wrote:
>> I was actually hoping that you would tell me this is overkill ;) I will try
>> to find some and take a heap dump of them.
> 
> Here's what I got from Eclipse, excluding arrays:
> 
>     {14571, 491336, 23885, 346712, 745867, 919, 2215, 3782, 3096, 17753, 559, 35539, 127, 27, 474, 10, 144, 9, 11, 10, 8, 5, 1, 17, 515, 1, 16, 0, 0, 0, 0, 0, 17, 1, 0, 0, 0, 0, 0, 2, 0, 34, 37, 23, 10, 42, 26, 47, 26, 8, 7, 6, 15, 5, 5, 0, 28, 36, 25, 7, 10, 11, 4, 0, 1};
> 
> This is the frequency of objects of various sizes, starting at 0 machine words.
> This doesn't include the two words at the start of each object.

That's good, but not enough. We really need to get the shape of the objects (e.g. the number and the
type of fields) to say if fwdptr compression is able to fit into the alignment gaps within the
object, thus trimming down the footprint.

-Aleksey