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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"
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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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            <div> </div>
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              .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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