[MITgcm-support] "blanklist" parameter in MITgcm

[Jean-Michel Campin]

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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