Garbage collection

[Stanislav Blinov]

On Saturday, 27 June 2020 at 11:11:38 UTC, James Gray wrote:

> I am measuring the memory usage using top from the command line.
> GC.minimize() does seem to stop the leak.

That is not a memory leak. That's the allocator keeping pages for 
itself to not have to go to the kernel every time you allocate.

> But it doesn't explain why the program isn't releasing 
> essentially all the memory between calls to f (it using around 
> 2GB ram all the time).

Allocators usually don't do that. They keep (at least some) 
memory mapped to make allocations more efficient.

> Is there a way of achieving that?

I would think collect + minimize should do the trick. Just keep 
in mind that that's grossly inefficient.