iPhone vs Android

[Laeeth Isharc via Digitalmars-d]

On Tuesday, 13 September 2016 at 11:59:46 UTC, Shachar Shemesh 
wrote:
> On 13/09/16 02:21, deadalnix wrote:
>>
>> I stay convinced that an hybrid approach is inevitable and am 
>> surprised
>> why few are going there (hello PHP, here right).
>>
>
> Here's my worries about the hybrid approach. The GC run time is 
> proportional not to the amount of memory you manage with the 
> GC, but to the amount of memory that might hold a pointer to a 
> GC managed memory. In other words, if most of my memory is RC 
> managed, but some of it is GC, I pay the price of both memory 
> manager on most of my memory.
>
> Shachar

Hi Shachar.

I hope you're well.

Would you mind elaborating a bit on why the cost of GC managed 
memory is as high as you imply when combined with other 
approaches, at least on a 64 bit machine and presuming you have a 
degree of hygiene and don't directly use a pointer allowed to 
point to either.   Eg if you use GC for long lived allocations 
and RC for short lived ones (and the RC constructor makes sure 
the thing is not registered with the GC so that takes care of 
short lived parts of long lived structures),  how in practice 
would this be a problem  ? I am no GC expert,  but keen to update 
my mental model.


Laeeth