<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Fri, Feb 28, 2014 at 8:18 PM, Luc Berger-Vergiat <span dir="ltr"><<a href="mailto:luc.berger.vergiat@gmail.com" target="_blank">luc.berger.vergiat@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word">Hi all,<div>sorry for the cryptic title but this is a little complex.</div><div>Here is what I am doing:</div>
<div>I created a DMShell that gets four fields passed from a PetscSection.</div><div>Now I am doing this because I want to apply a schur complement to my problem.</div><div>In order to do so I pass the following arguments to my code:</div>
<div><br></div><div><font face="'Lucida Console'">-ksp_type gmres</font></div><div><font face="'Lucida Console'">-pc_type fieldsplit</font></div><div><font face="'Lucida Console'">-pc_fieldsplit_type schur</font></div>
<div><font face="'Lucida Console'">-pc_fieldsplit_schur_factorization_type full</font></div><div><font face="'Lucida Console'">-pc_fieldsplit_0_fields 2,3 <--- This define A00 for my schur</font></div>
<div><font face="'Lucida Console'">-pc_fieldsplit_1_fields 0,1</font></div><div><font face="'Lucida Console'"><br></font></div><div>Up to here everything works fine and as expected (I actually do a -ksp_view to make sure that everything makes sense).</div>
<div>Now things get tricky, I would like to compute A00^-1 using another schur decomposition so here are the commands I issue:</div><div><br></div><div><font face="'Lucida Console'"> -fieldsplit_0_ksp_type preonly</font></div>
<div><font face="'Lucida Console'"> -fieldsplit_0_pc_type fieldsplit</font></div><div><font face="'Lucida Console'"> -fieldsplit_0_</font><span style="font-family:'Lucida Console'">pc_fieldsplit_type schur</span></div>
<div><span style="font-family:'Lucida Console'"> </span><font face="'Lucida Console'">-fieldsplit_0_</font><span style="font-family:'Lucida Console'">pc_fieldsplit_</span><span style="font-family:'Lucida Console'">schur_factorization_type full</span></div>
<div><span style="font-family:'Lucida Console'"> -fieldsplit_0_pc_fieldsplit_0_fields 2</span></div><div><span style="font-family:'Lucida Console'"> </span><span style="font-family:'Lucida Console'">-fieldsplit_0_pc_fieldsplit_1_fields 3</span></div>
<div><span style="font-family:'Lucida Console'"><br></span></div><div>I am almost sure that the 4 first commands are correct, I am not however sure that the last two are understood by PETSc.</div><div>Actually I am worried that the DMShell that I created for the first level schur is not passed on the second level schur.</div>
<div>Here is the error message I get when I run my code:</div></div></blockquote><div><br></div><div>Sorry, I am really bogged down at the moment. Can you try this:</div><div><br></div><div> 1) You do not need to specify 2,3 for the inner fields since it will use them automatically</div>
<div><br></div><div> 2) Can you try changing src/dm/impls/shell/dmshell.c:664 to include DMSetUp(*subdm); ?</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word"><div><div>[0]PETSC ERROR: --------------------- Error Message ------------------------------------</div><div>[0]PETSC ERROR: Object is in wrong state!</div><div>[0]PETSC ERROR: Decomposition defined only after DMSetUp!</div>
<div>[0]PETSC ERROR: ------------------------------------------------------------------------</div><div>[0]PETSC ERROR: Petsc Development GIT revision: v3.4.3-4597-g3edecfd GIT Date: 2014-02-20 20:43:18 -0600</div><div>[0]PETSC ERROR: See docs/changes/index.html for recent updates.</div>
<div>[0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.</div><div>[0]PETSC ERROR: See docs/index.html for manual pages.</div><div>[0]PETSC ERROR: ------------------------------------------------------------------------</div>
<div>[0]PETSC ERROR: /home/luc/research/feap_repo/ShearBands/parfeap-petsc34/feap on a arch-linux2-c-opt named euler by luc Fri Feb 28 20:07:18 2014</div><div>[0]PETSC ERROR: Libraries linked from /home/luc/research/petsc/arch-linux2-c-opt/lib</div>
<div>[0]PETSC ERROR: Configure run at Fri Feb 21 17:31:31 2014</div><div>[0]PETSC ERROR: Configure options --download-cmake --download-hypre --download-metis --download-mpich --download-parmetis --with-debugging=0 --with-share-libraries=0</div>
<div>[0]PETSC ERROR: ------------------------------------------------------------------------</div><div>[0]PETSC ERROR: DMCreateFieldDecomposition() line 1262 in /home/luc/research/petsc/src/dm/interface/dm.c</div><div>[0]PETSC ERROR: PCFieldSplitSetDefaults() line 336 in /home/luc/research/petsc/src/ksp/pc/impls/fieldsplit/fieldsplit.c</div>
<div>[0]PETSC ERROR: PCSetUp_FieldSplit() line 485 in /home/luc/research/petsc/src/ksp/pc/impls/fieldsplit/fieldsplit.c</div><div>[0]PETSC ERROR: PCSetUp() line 888 in /home/luc/research/petsc/src/ksp/pc/interface/precon.c</div>
<div>[0]PETSC ERROR: KSPSetUp() line 278 in /home/luc/research/petsc/src/ksp/ksp/interface/itfunc.c</div><div>[0]PETSC ERROR: KSPSolve() line 390 in /home/luc/research/petsc/src/ksp/ksp/interface/itfunc.c</div><div>[0]PETSC ERROR: PCApply_FieldSplit_Schur() line 859 in /home/luc/research/petsc/src/ksp/pc/impls/fieldsplit/fieldsplit.c</div>
<div>[0]PETSC ERROR: PCApply() line 440 in /home/luc/research/petsc/src/ksp/pc/interface/precon.c</div><div>[0]PETSC ERROR: KSP_PCApply() line 227 in /home/luc/research/petsc/include/petsc-private/kspimpl.h</div><div>[0]PETSC ERROR: KSPInitialResidual() line 64 in /home/luc/research/petsc/src/ksp/ksp/interface/itres.c</div>
<div>[0]PETSC ERROR: KSPSolve_GMRES() line 234 in /home/luc/research/petsc/src/ksp/ksp/impls/gmres/gmres.c</div><div>[0]PETSC ERROR: KSPSolve() line 432 in /home/luc/research/petsc/src/ksp/ksp/interface/itfunc.c</div></div>
<div><br></div><div>Let me know if I'm doing something wrong or misunderstood something.</div><div><br></div><div>Best,</div><div>Luc</div></div></blockquote></div><br><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
</div></div>