[MITgcm-support] Memory estimates

Gøran Brostrøm goran.brostrom at met.no
Mon Oct 13 11:15:32 EDT 2008

Hi David
An old formula is that memory=nx*ny*nz*8 *50. That is the model uses 
about 50 double prec fields. If you use timeave it  is probably somewhat 
higher. Perhaps the newer model versions are also more craving on 
memory. You can always make a relatively small experiment and look on 
how much memory is used (top probably gives you the memory usage) to 
find the no of fields the model uses.

David Hebert wrote:
> Hello all,
> Is there a common rule of thumb for estimating the amount of memory a 
> simulation will use? For example, if there are 9 output fields 
> (U,V,W,T,S,PH,PNH,hFacC,hFacW, perhaps others) * 2 for AB 
> timestepping, could one say there are 18 fields in memory. Then 
> knowing the size of the fields you can get a good estimate on the 
> memory required, and then based on node/processor memory number of 
> processors one should use.
> Thanks,
> David
> -- 
> David A. Hebert
> NRC Postdoc
> Naval Research Lab
> Stennis Space Center, MS 39525
> david.hebert.ctr at nrlssc.navy.mil <mailto:david.hebert.ctr at nrlssc.navy.mil>
> Phone: (228) 688-5846
> Fax:     (228) 588-5997
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