[MITgcm-support] "blanklist" parameter in MITgcm

[Matthew Mazloff]

ps>
Regarding "and then change nPy = 3? And would i run with e.g. "mpirun -n 6” ?"
It would be
mpirun -n = 3

And Regarding "could input files still be defined as arrays of dimensions (sNx*2, sNy*4), i.e. of the same size as if i were not blanking tiles?”
Yes


> On Nov 8, 2022, at 8:00 AM, Matthew Mazloff <mmazloff at ucsd.edu> wrote:
> 
> This may be helpful too
> 
> https://github.com/MITgcm/MITgcm/pull/382
> 
> Matt
> 
> 
>> On Nov 8, 2022, at 7:54 AM, Daniel Goldberg <dan.goldberg at ed.ac.uk> wrote:
>> 
>> Thanks J-M. I did not know i needed to include the exch2 package. 
>> 
>> best
>> dan
>> 
>> On Tue, Nov 8, 2022 at 3:46 PM Jean-Michel Campin <jmc at mit.edu> wrote:
>> This email was sent to you by someone outside the University.
>> You should only click on links or attachments if you are certain that the email is genuine and the content is safe.
>> 
>> Hi Dan,
>> 
>> To use blank-tiles, you need:
>> 1) to compile pkg/exch2 (will be used if compiled, no run-time switch)
>> 2) provide a list of blank-tile in "data.exch2".
>> the example I am aware of arei, in verification/:
>>   adjustment.cs-32x32x1/input/data.exch2.mpi  (cs-grid, 4 blank-tiles)
>>   global_ocean.90x40x15/input/data.exch2.mpi  (lat-lon grid, 1 blank-tile)
>> these 2 are intented to be copied to "data.exch2"
>> And note that you will have to set "dimsFacets" to the size of the full domain
>> (including the blank-tiles) like in the later example: dimsFacets = 90, 40,
>> 3) to find the list of empty tiles to specify, the simplest is to run 1 time-step
>> with an executable compiled without blank-tile (but same sNx,sNy) and to surch for
>>  "Empty tile: #" in all STDOUT ; those numbers will be the ones to list in "blankList".
>> 
>> Cheers,
>> Jean-Michel
>> 
>> On Tue, Nov 08, 2022 at 03:15:33PM +0000, Daniel Goldberg wrote:
>>> Hello All
>>> 
>>> Can I ask about how to use the blankList parameter in data.exch2?
>>> 
>>> Can it be used for cartesian as well as cubed sphere grids? If so, Im unsure of how exactly to use it without examples shown.
>>> 
>>> the docs on the CS grid say:
>>> 
>>> 
>>>  *   The tiles omitted are specified in the file blanklist.txt by their tile number in the topology, separated by a newline.
>>>  *   The total number of tiles in the topology minus those listed in blanklist.txt must equal nSx*nPx.  (which i assume extends to the y direction -- but possibly not.)
>>> 
>>> So, if i wanted to have a grid where nSx=nSy=1, and the grid structure
>>> 
>>> nPx = 2
>>> nPy = 4
>>> 
>>> then i believe with a cartesian grid, the tile numbering would be
>>> 
>>> 3 7
>>> 2 6
>>> 1 5
>>> 0 4
>>> 
>>> where left = west, up = north, and i wanted to make tiles 2 and 3 blank. Would i set
>>> 
>>> blanklist = 2,3
>>> 
>>> and then change nPy = 3? And would i run with e.g. "mpirun -n 6" ? And, importantly, could input files still be defined as arrays of dimensions (sNx*2, sNy*4), i.e. of the same size as if i were not blanking tiles?
>>> 
>>> Many thanks!!!
>>> 
>>> Dan
>>> 
>>> 
>>> 
>>> --
>>> Daniel Goldberg, PhD (he/him)
>>> Reader in Glaciology
>>> School of Geosciences, University of Edinburgh
>>> Geography Building, Drummond Street, Edinburgh EH8 9XP
>>> 
>>> 
>>> em: dan.goldberg at ed.ac.uk<mailto:dan.goldberg at ed.ac.uk>
>>> web: https://www.geos.ed.ac.uk/homes/dgoldber
>>> The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. Is e buidheann carthannais a th??? ann an Oilthigh Dhùn Èideann, clàraichte an Alba, àireamh clàraidh SC005336.
>> 
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>> 
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