Usage of memory by arrays

[unDEFER]

On Thursday, 5 April 2018 at 21:11:53 UTC, Steven Schveighoffer 
wrote:

> But the old block doesn't go away! It's collected and stored in 
> a free list for future allocations.
>
> -Steve

Big thanks, -Steve! Really program like the next:

==============8<==============
void main()
{
     float[3] f;
     float[3][] x;
     float[3][] y;
     writefln("float = %s bytes", float.sizeof);
     writefln("float[3] = %s bytes", f.sizeof);

     int total = 200;
     foreach(i; 0..total)
     {
         foreach (j; 0..1000)
         {
             x ~= [0.01, 0.02, 0.03];
         }
     }

     int before = MemoryUsage();
     foreach(i; 0..total/2)
     {
         foreach (j; 0..1000)
         {
             y ~= [0.01, 0.02, 0.03];
         }
     }
     int after = MemoryUsage();
     writefln("%dK * float[3] = %d Kbytes", total/2, 
(after-before));
}
==============>8==============

Prints:
float = 4 bytes
float[3] = 12 bytes
100K * float[3] = 1320 Kbytes

Very well. I'm thinking how to optimize my game program to not be 
"pathological" on loading the models.