Allocation strategies question

[ref2401 via Digitalmars-d-learn]

On Friday, 30 October 2015 at 04:11:05 UTC, ref2401 wrote:
> It would be greate if compiler were able to use `theAllocator` 
> and `processAllocator` but they don't seem much helpfull. 
> Terrible naming by the way.

I should have suggested different names if don't like present 
ones.
if `processAllocator` stands for the whole process then there 
must be `threadAllocator` as well. But that's not the question.
I would like to know about usage strategies of various allocators 
within the same code.