[FLASH-USERS] How memory requirement calculations work ?

[Latif]

Hi
Dear All,
I am trying to run 512^3 ( which is equivalent to lrefinemax=7 in 3-D) 
uniform grid cosmological simulations (including gravity, particles, 
hydro,EOS). I am running FLASH on 250 GB internal memory machine.  I was 
not able to able to run simulations because i received the message that 
there is not enough virtual memory available. Will using uniform grid 
(UG) will reduce memory requirements. Can any one explain to me, how 
memory  requirement calculation is done in FLASH. I am really interested 
in knowing about. Some guy was arguing with me that he can run run 512^3 
sph simulations on 30 GB machine why you can't. Memory requirement in 
AMR codes is generally high. Which part of FLASH is expensive in terms 
of memory? How can i know how much memory i will be required for X^3 
grid calculations?
Cheers
Latif