🚀 go-pugleaf

Hello,

While running i need to create a buffer that will hold data, and
i need to do lot of calculations on this buffer, i need it to be
as fast as possible, and i need that the buffer will also be as
large as possible to hold as much data as it possibly can.

Now the problem is this, as i understand if i declare on a very 
large buffer and fills if with data, like this for example - 

 double *HugeBuffer = new double[0xFFFFFFFFFFFFFFFFFFFFFF];

 Fills HugeBuffer[] with data from file...    

then becouse the PC doesn't have so much memory it will use part
of the Hard-Drive to hold this buffer data, but that will slow
down my calculations right? so i want to make sure that all the
data in my application while running is presents ONLY in the PC
real memory and not on the hard disk, i don't want the program 
to waste time approaching the hard disk reading and writing data
to the buffer.

So How do i detect what is the largest size of buffer that i can
use that will not use the hard drive space? i guess that it can 
be change from one running to another depends on the amount of
memory which is in used at that moment.

Thanks,

Dani.