<div dir="ltr"><a href="https://gitlab.com/petsc/petsc/-/blob/main/src/vec/is/sf/tests/ex9.c">https://gitlab.com/petsc/petsc/-/blob/main/src/vec/is/sf/tests/ex9.c</a><div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">--Junchao Zhang</div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Feb 16, 2022 at 9:40 AM Medane TCHAKOROM <<a href="mailto:medane.tchakorom@univ-fcomte.fr">medane.tchakorom@univ-fcomte.fr</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Re:</p>
<p><br>
</p>
<p>Sorry, but I can't find this file in my installation. I'am using
Petsc 3.14.2</p>
<p><br>
</p>
<p>Thanks<br>
</p>
<div>On 16/02/2022 16:00, Junchao Zhang
wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">We could still do it. See the example at
petsc/src/vec/is/sf/tests/ex9.c
<div><br clear="all">
<div>
<div dir="ltr">
<div dir="ltr">--Junchao Zhang</div>
</div>
</div>
<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Feb 16, 2022 at 8:47
AM Medane TCHAKOROM <<a href="mailto:medane.tchakorom@univ-fcomte.fr" target="_blank">medane.tchakorom@univ-fcomte.fr</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Re:</p>
<p><br>
</p>
<p>It does not apply, because "<span>their
communicator must be on the same set of processes" .</span></p>
<p>In my case, I have two disjoint subcomm from
PETSC_COMM_WORD with same number of processes.<br>
</p>
<p>I want to send information (Petsc Vec) from one subcomm
to another subcomm.</p>
<p>Thanks<br>
</p>
<div>On 16/02/2022 15:43, Junchao Zhang wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">See Notes at <a href="https://petsc.org/main/docs/manualpages/PetscSF/VecScatterCreate.html" target="_blank">https://petsc.org/main/docs/manualpages/PetscSF/VecScatterCreate.html</a>
<div><br>
</div>
<div>Does it apply to your case? </div>
<div><br clear="all">
<div>
<div dir="ltr">
<div dir="ltr">--Junchao Zhang</div>
</div>
</div>
<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Feb 16, 2022
at 8:12 AM Medane TCHAKOROM <<a href="mailto:medane.tchakorom@univ-fcomte.fr" target="_blank">medane.tchakorom@univ-fcomte.fr</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Re:</p>
<p>I forgot to mention that the nodes are in
differents communicators. Does VecScatter
functionnality still applies ?</p>
<p>Thanks.<br>
</p>
<div>On 16/02/2022 15:03, Matthew Knepley wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">On Wed, Feb 16, 2022 at 8:55 AM
Medane TCHAKOROM <<a href="mailto:medane.tchakorom@univ-fcomte.fr" target="_blank">medane.tchakorom@univ-fcomte.fr</a>>
wrote:<br>
</div>
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hello,<br>
<br>
I want to pass a Petsc Vec from one node to
another one. Is there any <br>
Petsc method for doing this<br>
</blockquote>
<div><br>
</div>
<div>You likely want the VecScatter
functionality. There is a discussion of this
in the manual: <a href="https://petsc.org/main/docs/manual/vec/?highlight=vecscatter#sec-unstruct" target="_blank">https://petsc.org/main/docs/manual/vec/?highlight=vecscatter#sec-unstruct</a></div>
<div><br>
</div>
<div> Thanks,</div>
<div><br>
</div>
<div> Matt</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> or
should I use MPI_Irecv and MPI_Isend for
non-blocking communication ?<br>
<br>
When using MPI_Isend, can i send a Petsc
Vec, or should I get the array <br>
from it, and then send it ?<br>
<br>
Thanks<br>
<br>
</blockquote>
</div>
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<div><br>
</div>
-- <br>
<div dir="ltr">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div>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>
<div><br>
</div>
<div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</blockquote>
</div>
</blockquote>
</div>
</blockquote>
</div>
</blockquote>
</div>
</blockquote></div>