[MITgcm-support] changing the number of tiles

[Baylor Fox-Kemper]

No interpickups isn't necessary if there is no interpolation or  
coarsening, but it will work in that case, too.

What Ed is suggesting (I think) doesn't require netcdf.  However,  
someone not using netcdf should spell out exactly how this is to be  
done.  I think usually one needs to keep the number of tiles fixed,  
while changing the number of processors.  However, this process  
seemed messy to me, so that's why I wrote interpickups in the first  
place.

Will someone please explain how to do retiling, or at pickup  
conversions (without cubed sphere complications is fine) in the  
pickups for posterity?
   -Baylor


On Mar 1, 2006, at 5:49 PM, Paola Cessi wrote:

> Is interpickups.m necessary if the number of gridpoints is the  
> same, and thus no interpolation is needed, but the tiling changes?  
> paola
>
> On Wed, 1 Mar 2006, Baylor Fox-Kemper wrote:
>
>> Hi Paola,
>>  There is a little program: utils/matlab/interpickups.m, that I  
>> wrote a while back (and I think works with the present version of  
>> the code).  It takes a bunch of mnc input pickup files with one  
>> tiling and a bunch of mnc output pickup files with a different  
>> tiling, and interpolates between them in a simple way.  This way  
>> you can coarsen or fine-grain a set of pickup files to restart  
>> with a different tiling or even a different resolution.  If the  
>> number of gridpoints in the input and outputs is the same, it  
>> shouldn't change the data at all, it should just copy it  
>> appropriately from the input files to the outputs.
>>  The easy way to get the output pickups is to set up the model  
>> with the new gridding and run for one timestep outputting a  
>> pickup.  The routine will then overwrite the data in the files  
>> with the interpolated data from the set of input files.
>>  Cheers,
>>    -Baylor
>>
>>
>>
>> On Mar 1, 2006, at 2:47 PM, Paola Cessi wrote:
>>
>>> Is it possible to restart a computation with 4*N tiles, using the  
>>> pickup files generated with N tiles, while keeping Nx and Ny  
>>> fixed? In other words, is it possible to change nPx and nPy in a  
>>> restart run, while keeping Nx and Ny the same? (without using  
>>> netcdf)
>>> paola
>>> -------------------------------------------------------------------- 
>>> -----
>>> Paola Cessi                            Tel: +1 858 534 0622
>>> Scripps Institution of Oceanography    Fax: +1 858 534 8045
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>>> UCSD-0213                              e-mail: pcessi at ucsd.edu
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