<div dir="ltr"><div dir="ltr">On Wed, Apr 10, 2019 at 11:29 AM Manuel Colera Rico via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</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 am trying to solve a system whose matrix is of type MatNest. If I <br>
don't use KSPSetUp(), everything is fine. However, if I use that <br>
routine, I get the following error:<br>
<br>
0]PETSC ERROR: --------------------- Error Message <br>
--------------------------------------------------------------<br>
[0]PETSC ERROR: Invalid argument<br>
[0]PETSC ERROR: Nest vector arguments 1 and 2 have different numbers of <br>
blocks.<br></blockquote><div><br></div><div>This seems self-explanatory. Nest vectors must have the same number of blocks to be compatible.</div><div><br></div><div>More broadly, there should be no reason to use Nest vectors or matrices. It is an optimization to</div><div>be used at the very end, only after you have profiled the code and seen that its important. You can</div><div>do everything you want to do without ever touching Nest, and it looks like the Nest interface is a</div><div>problem for your code right now.</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">
[0]PETSC ERROR: See <a href="http://www.mcs.anl.gov/petsc/documentation/faq.html" rel="noreferrer" target="_blank">http://www.mcs.anl.gov/petsc/documentation/faq.html</a> <br>
for trouble shooting.<br>
[0]PETSC ERROR: Petsc Release Version 3.11.0, unknown<br>
[0]PETSC ERROR: <br>
/home/manu/Documents/FEM-fluids/C-codes/CLG2-ConvectionDiffusion/Debug/CLG2-ConvectionDiffusion <br>
on a mcr_20190405 named mancolric by Unknown Wed Apr 10 17:20:16 2019<br>
[0]PETSC ERROR: Configure options --with-cc=gcc --with-cxx=g++ <br>
--with-fc=gfortran COPTFLAGS="-O3 -march=native -mtune=native" <br>
CXXOPTFLAGS="-O3 -march=native -mtune=native" FOPTFLAGS="-O3 <br>
-march=native -mtune=native" --with-debugging=0 --download-fblaslapack <br>
--download--f2cblaslapack --download-mpich --download--hypre <br>
--download-scalapack --download-mumps --download-suitesparse <br>
--download-ptscotch --download-pastix --with-matlab --with-openmp<br>
[0]PETSC ERROR: #1 VecCopy_Nest() line 68 in <br>
/opt/PETSc_library/petsc-3.11.0/src/vec/vec/impls/nest/vecnest.c<br>
[0]PETSC ERROR: #2 VecCopy() line 1614 in <br>
/opt/PETSc_library/petsc-3.11.0/src/vec/vec/interface/vector.c<br>
[0]PETSC ERROR: #3 KSPInitialResidual() line 63 in <br>
/opt/PETSc_library/petsc-3.11.0/src/ksp/ksp/interface/itres.c<br>
[0]PETSC ERROR: #4 KSPSolve_GMRES() line 236 in <br>
/opt/PETSc_library/petsc-3.11.0/src/ksp/ksp/impls/gmres/gmres.c<br>
[0]PETSC ERROR: #5 KSPSolve() line 782 in <br>
/opt/PETSc_library/petsc-3.11.0/src/ksp/ksp/interface/itfunc.c<br>
[0]PETSC ERROR: #6 mwe() line 55 in ../Tests/tests.c<br>
<br>
Please find attached a MWE (it is a slight modification of that of the <br>
post opened by Ce Qin, <br>
<a href="https://lists.mcs.anl.gov/pipermail/petsc-users/2015-February/024230.html" rel="noreferrer" target="_blank">https://lists.mcs.anl.gov/pipermail/petsc-users/2015-February/024230.html</a>, <br>
whose answer I have not found).<br>
<br>
By the way, with the newest version of PETSc, Eclipse marks as errors <br>
the commands PetscFree, CHKERRQ, PETSC_COMM_SELF,... although it <br>
compiles and executes well. Perhaps it is a problem related to Eclipse, <br>
but this did not happen with the older versions of PETSc.<br>
<br>
Thanks and regards,<br>
<br>
Manuel<br>
<br>
---<br>
<br>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><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>