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<div class="moz-cite-prefix">On 10/11/2015 8:25 PM, Matthew Knepley
wrote:<br>
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cite="mid:CAMYG4G=68vbeVcZiNizEt-HnaharkL7GWrXhuMPJkUQ0vj_aXg@mail.gmail.com"
type="cite">
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<div class="gmail_quote">On Tue, Nov 10, 2015 at 1:33 AM, TAY
wee-beng <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:zonexo@gmail.com" target="_blank">zonexo@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
I need a subroutine in Fortran to partition a subset of my
grid in the 3 x,y,z directions for MPI. I thought of using
DMDACreate3d and DMDAGetCorners to get the starting and
width of the partitioned grid.<br>
<br>
Because I need to partition at every time step and the
subset grid changes dimension and index at every time
step, so I will also need to use DMDestroy after each time
step<br>
<br>
Will that use alot of memory? Will the grid actually be
created? So I wonder if this DMDACreate3d and DMDestroy
calls will take a lot of time.</blockquote>
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<div>DMDA just does 1D partitioning in each dimension, so
its not that sophisticated. Is that all you want?</div>
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<div> Matt</div>
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Hi,<br>
<br>
Ya, that's all I want. Btw, how does DMDACreate3d partition the
grids in x,y,z? What is the algorithm behind it?<br>
<br>
Supposed I have 14 x 17 x 20 and 12 cores. How does DMDACreate3d
partition it?<br>
<br>
Thanks.<br>
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cite="mid:CAMYG4G=68vbeVcZiNizEt-HnaharkL7GWrXhuMPJkUQ0vj_aXg@mail.gmail.com"
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<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"><span
class="HOEnZb"><font color="#888888"><br>
-- <br>
Thank you.<br>
<br>
Yours sincerely,<br>
<br>
TAY wee-beng<br>
<br>
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-- <br>
<div class="gmail_signature">What most experimenters take for
granted before they begin their experiments is infinitely
more interesting than any results to which their experiments
lead.<br>
-- Norbert Wiener</div>
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