[MITgcm-support] Equatorial Channel from -70 degree to +70 degree

[Martin Losch]

Yuan,

the results from
nPx=8, sNx=32, sNy=93 should be exactly the same (except for round- 
off error) as those from
nPx=4, sNx=64, sNy=93,
nPx=2, sNx=128, sNy=93, and
nPx=1, sNx=256, sNy=93, regardless of time step.
When you have NaN's in one case and no NaN's in another, then  
something else is wrong. What about your nSx/nSy? both should be 1 in  
all of these examples so that  sNx*nSx*nPx = 256, and sNy*nSy*nPy =  
93 for all cases.

Martin

On 4 Oct 2006, at 08:29, Yuan Lian wrote:

> Hi, Dimitris,
>
> Thanks. I tried the configuration nPx=8, sNx=32, sNy=93 but the  
> simulation gave NAN values. I had to reduce the number of grids in  
> latitude. The configuration nPx=4, sNx=64, sNy=63 worked just fine.  
> I will try nPx=4, sNx=64, sNy=93 and see how it works. I might try  
> to use very short time step as well.
>
> cheers,
> Yuan
>
> Dimitris Menemenlis wrote:
>
>> Hi Yuan,
>>
>>> I noticed that, in order to run the simulation, the number of  
>>> grid points in
>>> X direction has to be greater than the number of grids in Y  
>>> direction in a
>>> single tile.
>>
>>
>> There is no such restriction as far as possible model  
>> configurations are concerned.
>>
>>> The number of grids is 256x93
>>> So the question is: how to configure the "SIZE.h" to run the  
>>> simulation with
>>> 4 or 8 processors?
>>
>>
>> Since 93 is not divisible by 2, and assuming you are using MPI,   
>> you can have
>>  nPx=4, sNx=64, sNy=93 and
>>  nPx=8, sNx=32, sNy=93.
>>
>> Cheers, Dimitris
>>
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>
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