Commit size and Page fault's very large for simple program

[Hiemlick Hiemlicker via Digitalmars-d-learn]

version(Windows)

void main()
{
	import std.random;

	while(getchar() != EOF)
	{
		auto x = new int[std.random.uniform(1000000, 10000000)];

		writeln("--------");
		bThread.Now();

	}
}

more or less, ends up with a huge amount of page faults and a 
several hundred MB commit size(hold enter down a bit). I'm trying 
to understand this. Is that normal behavior for normal 
programs(haven't tried it with a similar C++ example though).

I realize the GC has to do some work and all that but the program 
only has a working set of a few MB yet a commit of 10 times that.

Is commit size essentially "touched" memory but really doesn't 
mean much to overall free ram?(can other programs use it at some 
point)?


We know the program is not using more than 10MB of extra 
memory(since x is local)... so I'd only expect the footprint to 
be a max of around 15-20MB. not 150MB+(depends on how fast and 
long you hit enter).