[MITgcm-support] Memory estimates

[Christopher L. Wolfe]

Also, since the MITgcm uses mostly statically allocated memory,  
running size -A mitgcmuv on the compiled executable will tell you the  
amount of memory (minus system overhead) the job will require per  
process.

Christopher

-----------------------------------------------------------
Dr. Christopher L. Wolfe              	   858-534-4560
Physical Oceanography Research Division    OAR 357
Scripps Institution of Oceanography, UCSD  clwolfe at ucsd.edu
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On Oct 13, 2008, at 8:15 AM, Gøran Brostrøm wrote:

> 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.
> gøran
>
>
> 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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>
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