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Hi Hassan,
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<div>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?</div>
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<div>Samar<br>
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<div>On Jun 22, 2023, at 5:51 PM, Hassan Mason <hcm7920@nyu.edu> wrote:</div>
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<div class="gmail_default" style="font-size:large">Hi all,</div>
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<div class="gmail_default" style="font-size:large">I'm currently constructing an addition to MITgcm and I'm stuck implementing it with MPI.</div>
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<div class="gmail_default" style="font-size:large">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.</div>
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<div class="gmail_default" style="font-size:large">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?</div>
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<div class="gmail_default" style="font-size:large">Thanks!</div>
<div class="gmail_default" style="font-size:large">Hassan Mason</div>
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