[MITgcm-support] nPx vs. nPy

[taimaz.bahadory]

Hi;

I have configures a code to run my topography file using parallel system
(mpi). Everything works fine when I set nPy=10 (or anything), but the
errors come out when I try to break the x-direction to different sections,
i.e. increasing nPx to something more than 1.
summary:

   - nPx = 1; nPy = 10 => works fine
   - nPx = 10; nPy = 1 => fails

Is there any limitation on the x-axis?
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