<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Times New Roman \(Body CS\)";
panose-1:2 11 6 4 2 2 2 2 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.msonormal0, li.msonormal0, div.msonormal0
{mso-style-name:msonormal;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Times New Roman",serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style>
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">petsc-users <petsc-users-bounces@mcs.anl.gov> on behalf of "von Ramm, Alexander via petsc-users" <petsc-users@mcs.anl.gov><br>
<b>Reply-To: </b>"von Ramm, Alexander" <Alexander.vonRamm@lrz.de><br>
<b>Date: </b>Thursday, November 7, 2019 at 11:12 AM<br>
<b>To: </b>"petsc-users@mcs.anl.gov" <petsc-users@mcs.anl.gov><br>
<b>Subject: </b>[petsc-users] DMNetwork - how to interprete the arguments of DMNetworkSetSizes ?<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">Hello together, <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">I'm trying to figure out how to create a DMNetwork, but the proper way to set the parameters eludes me (also there is some discrepancy between the manual
<a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manual.pdf">https://www.mcs.anl.gov/petsc/petsc-current/docs/manual.pdf</a> (page 166) and the online documenation
<a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DMNetwork/DMNetworkSetSizes.html">
https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DMNetwork/DMNetworkSetSizes.html</a> ).<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">Thanks for pointing out the discrepancy. We’ll update the user manual.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">Currently I'm trying to set a up a simple Network with 8 nodes and 7 edges and distribute it over 2 processors. In the call DMNetworkSetSizes does Nsubnet need to be 1 (one global network, without any further subnetworks)
or 2 (one subnetwork per processor) (my guess would be the former). <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">Yes, Nsubnet = 1 for your application since you just have a single network, i.e., no subnetworks.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">My current attempt looks like the following:
<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">int main( int argc, char *argv[]) {<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> PetscInitialize(&argc, &argv, NULL, NULL);<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> DM dm;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> PetscInt NSubnet = 1;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> PetscInt nV[1] = {8};<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> PetscInt nE[1] = {7};<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> PetscInt NsubnetCouple = 0;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> PetscInt nec[0];<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">You do not need nec. You can simply set it to NULL.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> DMNetworkCreate(PETSC_COMM_WORLD, &dm);<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> DMNetworkSetSizes(dm, NSubnet, nV, nE, NsubnetCouple, nec);<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal">DMNetworkSetSizes(dm, NSubnet, nV, nE, NsubnetCouple, NULL);<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> PetscInt *edgeList;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> PetscMalloc1(14, &edgeList);<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[0] = 0;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[1] = 4;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[2] = 1;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[3] = 4;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[4] = 2;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[5] = 5;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[6] = 3;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[7] = 5;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[8] = 4;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[9] = 6;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[10] = 5;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[11] = 6;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[12] = 6;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edgeList[13] = 7;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> PetscInt *edges[1];<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> edges[0] = edgeList;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> DMNetworkSetEdgeList(dm, edges, NULL);<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> DMNetworkLayoutSetUp(dm);<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"> return 0;<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">}<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">Except from the Online Documenation I wasn't able to find any information/example where newest version Petsc was used when setting up a DMNetwork. (I found a few examples using older versions, however I could not
figure out how these could solved using the newest version).<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in">If some could explain to me the the correct interpretation of the parameters of DMNetworkSetSizes ? Any pointers to examples using the newest API would also be much appreciated.
<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">Most of the examples with DMNetwork have a single network (Nsubnet = 1), except src/snes/examples/tutorials/network/ex1.c. This is a water + electric network simulation
that has two subnetworks.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif">Shri<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">Thanks and best Regards, <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in">Alex <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
</div>
</div>
</body>
</html>