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<div class="moz-cite-prefix">Hi,<br>
<br>
Yes, a PetscSFMoveRoots() wrapper would be greatly appreciated,
especially since we want to ultimately wrap and access this via
petsc4py.<br>
<br>
Many thanks<br>
Michael<br>
<br>
<br>
On 12/11/13 17:02, Matthew Knepley wrote:<br>
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<blockquote
cite="mid:CAMYG4GktnquSbOgKQKh+Hx-M+nAJbmZ_qzLeE5YJi92==-6-8g@mail.gmail.com"
type="cite">
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<div dir="ltr">On Tue, Nov 12, 2013 at 9:59 AM, Jed Brown <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:jedbrown@mcs.anl.gov" target="_blank">jedbrown@mcs.anl.gov</a>></span>
wrote:<br>
<div class="gmail_extra">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">Michael Lange <<a
moz-do-not-send="true"
href="mailto:michael.lange@imperial.ac.uk">michael.lange@imperial.ac.uk</a>>
writes:<br>
<br>
> Hi Matt,<br>
><br>
> Thanks for the clarification, this does make sense.
I have achieved the<br>
> local DoF ordering I want by only permuting the
offsets in the created<br>
> section. However, I am now trying to extract the
according halo exchange<br>
> information from the associated PetscSF object and,
although the local<br>
> leafs have been renumbered according to my
permutation, the roots they<br>
> are connected to have not been updated. Is there an
easy way to update<br>
> the roots or re-initialise the PetscSF from the
reordered section?<br>
<br>
</div>
You can SFBcast the new root numbers and create a new SF.<br>
<br>
Since this is a somewhat common operation that can be
optimized by the<br>
SF implementation, it may make sense to provide
PetscSFMoveRoots() or<br>
some such.<br>
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<br>
I already do this in DMPlexPermute(). We can abstract the code
out.</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra"> Matt<br clear="all">
<div><br>
</div>
-- <br>
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
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