About GC

[Alexandr Druzhinin]

In the following code http://dpaste.dzfl.pl/f4ae16aa
memory consumption depends on DATA_SIZE value. Bigger value bigger 
consumption - it's natural. Consumption starts from some value and 
continue to some threshold. After reachin this threshold comsumption 
doesn't enlarge. This threshold depends on DATA_SIZE value and some 
others. My question is how can I find this threshold to know is this 
value suitable for real using or I should change something in my code. 
Is there some guarantee that this threshold will be less than real 
memory on the box? How can I control this threshold?

P.S. or may be I do something wrong in the snippet?