[MITgcm-support] Question about MPI sums

[Samar Khatiwala]

Hi Hassan,

I don’t know about MITgcm-specific routines but couldn’t you just use MPI_gather to get all the values to the root rank and then sum over whichever tiles you want?

Samar

On Jun 22, 2023, at 5:51 PM, Hassan Mason <hcm7920 at nyu.edu> wrote:

Hi all,

I'm currently constructing an addition to MITgcm and I'm stuck implementing it with MPI.

I have a value that's calculated for each tile and I need to sum over all tiles aligned in a horizontal direction. In other words, I want to sum over a specific column of tiles, and in the end each tile would know the sum of the column to which it belongs.

I see there are routines like global_sum_tile.F that perform a global sum, but are there any routines that are more selective about the tiles included in the sum? Alternatively, is there a routine that works like global_sum_tile.F but for element-wise vector addition instead of single values?

Thanks!
Hassan Mason
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