new Type[count] takes too much?

[Namespace]

On Thursday, 31 October 2013 at 09:48:23 UTC, safety0ff wrote:
> On Thursday, 31 October 2013 at 09:15:53 UTC, Namespace wrote:
>> I'm sure we had already this conversation but I don't find the 
>> thread.
>>
>> T[] buffer = new T[N]; assumes more space than stated (in 
>> average 2010 elements more. See: 
>> http://dpaste.dzfl.pl/af92ad22c). It behaves exactly like 
>> reserve and that is IMO wrong. If I reserve memory with 
>> buffer.reserve(N), I want to have at least N elements. That 
>> behaviour is correct. But if I use new T[N] I mostly want 
>> exactly N elements and no extra space.
>>
>> Thoughts?
>
> To me it looks like it is derived directly from the way the GC 
> allocates chunks:
> Next power of two if less than 4096 otherwise some multiple of 
> 4096.
>
> Unless you modify the GC, this behaviour is present whether you 
> can see it or not (http://dpaste.dzfl.pl/5481ffc2 .)

Maybe (and hopefully) I'm wrong, but it seems that the static 
array is on the heap?