<div class="gmail_quote">On Fri, Jun 29, 2012 at 12:17 AM, Kaus, Boris <span dir="ltr"><<a href="mailto:kaus@uni-mainz.de" target="_blank">kaus@uni-mainz.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br>
<br>
If I understand this correctly, it also implies that the fieldsplit-in-fieldsplit options described in Jed's manuscript on the new multiphysics options of PETSc<br>
<br>
<a href="http://www.mcs.anl.gov/uploads/cels/papers/P2017-0112.pdf" target="_blank">http://www.mcs.anl.gov/uploads/cels/papers/P2017-0112.pdf</a><br>
<br>
section IV are broken in PETSC 3.3.<br>
That's a bummer as it is the preconditioner we most commonly used.<br></blockquote><div><br></div><div>There are nightly tests that use these options (src/ksp/ksp/examples/tests/ex11.c and src/ksp/ksp/examples/tutorials/ex43.c) so it appears that this problem is not always triggered. Thanks for the test case, we'll get this sorted out.</div>
<div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
cheers,<br>
Boris<br>
<div><div class="h5"><br>
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On Jun 28, 2012, at 8:55 PM, Barry Smith wrote:<br>
<br>
> Anton,<br>
><br>
> This came about because we are now being much more pedantic about the blocksizes of PETSc objects and not allowing them to be causally changed when they shouldn't be.<br>
><br>
> You can resolve this problem by editing the file src/ksp/pc/impls/fieldsplit/fieldsplit.c locate the function<br>
><br>
> #undef __FUNCT__<br>
> #define __FUNCT__ "PCApply_FieldSplit"<br>
> static PetscErrorCode PCApply_FieldSplit(PC pc,Vec x,Vec y)<br>
> {<br>
> PC_FieldSplit *jac = (PC_FieldSplit*)pc->data;<br>
> PetscErrorCode ierr;<br>
> PC_FieldSplitLink ilink = jac->head;<br>
> PetscInt cnt,bs;<br>
><br>
> PetscFunctionBegin;<br>
><br>
> and add the two lines right here<br>
><br>
> x->map->bs = jac->bs;<br>
> y->map->bs = jac->bs;<br>
><br>
><br>
> then run make cmake in that directory.<br>
><br>
> To resolve this permanently we will need to figure out how to insure those inner vectors are created with the correct block size. Are you willing to share your code with <a href="mailto:petsc-maint@mcs.anl.gov">petsc-maint@mcs.anl.gov</a> so that we can reproduce the problem and fix it properly for the long run? (The problem is in PETSc not in your code).<br>
><br>
> Barry<br>
><br>
><br>
><br>
> On Jun 28, 2012, at 10:44 AM, Anton Popov wrote:<br>
><br>
>> Dear petsc team,<br>
>><br>
>> I'm trying to use fieldsplit preconditioner for the velocity block in the Stokes system which is also preconditioned by<br>
>> fieldsplit (kind of recursive).<br>
>><br>
>> Running example 42 from src/ksp/ksp/examples/tutorials with petsc-3.2, as follows:<br>
>><br>
>> mpiexec -np 4 ./ex42 \<br>
>> -stokes_ksp_type gcr \<br>
>> -stokes_ksp_rtol 1.0e-6 \<br>
>> -stokes_pc_type fieldsplit \<br>
>> -stokes_pc_fieldsplit_type SCHUR \<br>
>> -stokes_pc_fieldsplit_schur_factorization_type UPPER \<br>
>> -stokes_fieldsplit_u_ksp_type fgmres \<br>
>> -stokes_fieldsplit_u_ksp_rtol 1e-3 \<br>
>> -stokes_fieldsplit_u_pc_type fieldsplit \<br>
>> -stokes_fieldsplit_u_fieldsplit_ksp_type preonly \<br>
>> -stokes_fieldsplit_u_fieldsplit_pc_type ml \<br>
>> -stokes_fieldsplit_u_pc_fieldsplit_block_size 3 \<br>
>> -stokes_fieldsplit_u_pc_fieldsplit_type ADDITIVE \<br>
>> -stokes_fieldsplit_p_ksp_type preonly \<br>
>> -stokes_fieldsplit_p_pc_type jacobi \<br>
>> -stokes_ksp_monitor_blocks \<br>
>> -mx 16 \<br>
>> -model 3<br>
>><br>
>> gives nicely looking output.<br>
>><br>
>> But! Repeating the same exercise with petsc-3.3, like this (actually, there is only one difference: factorization -> fact):<br>
>><br>
>> mpiexec -np 4 ./ex42 \<br>
>> -stokes_ksp_type gcr \<br>
>> -stokes_ksp_rtol 1.0e-6 \<br>
>> -stokes_pc_type fieldsplit \<br>
>> -stokes_pc_fieldsplit_type SCHUR \<br>
>> -stokes-pc_fieldsplit_schur_fact_type UPPER \<br>
>> -stokes_fieldsplit_u_ksp_type fgmres \<br>
>> -stokes_fieldsplit_u_ksp_rtol 1e-3 \<br>
>> -stokes_fieldsplit_u_pc_type fieldsplit \<br>
>> -stokes_fieldsplit_u_fieldsplit_ksp_type preonly \<br>
>> -stokes_fieldsplit_u_fieldsplit_pc_type ml \<br>
>> -stokes_fieldsplit_u_pc_fieldsplit_block_size 3 \<br>
>> -stokes_fieldsplit_u_pc_fieldsplit_type ADDITIVE \<br>
>> -stokes_fieldsplit_p_ksp_type preonly \<br>
>> -stokes_fieldsplit_p_pc_type jacobi \<br>
>> -stokes_ksp_monitor_blocks \<br>
>> -mx 16 \<br>
>> -model 3<br>
>><br>
>> curses me hardly by claiming:<br>
>><br>
>> [0]PETSC ERROR: --------------------- Error Message ------------------------------------<br>
>> [0]PETSC ERROR: Object is in wrong state!<br>
>> [0]PETSC ERROR: Blocksize of x vector 1 does not match fieldsplit blocksize 3!<br>
>> [0]PETSC ERROR: ------------------------------------------------------------------------<br>
>> [0]PETSC ERROR: Petsc Release Version 3.3.0, Patch 0, Tue Jun 5 14:20:42 CDT 2012<br>
>> [0]PETSC ERROR: See docs/changes/index.html for recent updates.<br>
>> [0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.<br>
>> [0]PETSC ERROR: See docs/index.html for manual pages.<br>
>> [0]PETSC ERROR: ------------------------------------------------------------------------<br>
>> [0]PETSC ERROR: ./ex42 on a int32-deb named <a href="http://mac11-005.geo.uni-mainz.de" target="_blank">mac11-005.geo.uni-mainz.de</a> by anton Thu Jun 28 17:06:53 2012<br>
>> [0]PETSC ERROR: Libraries linked from /Users/anton/LIB/petsc-3.3-p0/int32-debug/lib<br>
>> [0]PETSC ERROR: Configure run at Tue Jun 12 15:32:21 2012<br>
>> [0]PETSC ERROR: Configure options PETSC_DIR=/Users/anton/LIB/petsc-3.3-p0 PETSC_ARCH=int32-debug --download-f-blas-lapack=1 --with-debugging=1 --COPTFLAGS="-g -O0" --FOPTFLAGS="-g -O0" --CXXOPTFLAGS="-g -O0" --with-c++-support=1 --with-fortran=1 --with-fortran-kernels=1 --with-large-file-io=1 --with-mpi-compilers=1 --with-cc=mpicc --with-cxx=mpicxx --with-fc=mpif90 --download-ml=1 --download-hypre=1 --download-blacs=1 --download-scalapack=1 --download-metis=1 --download-parmetis=1 --download-mumps=1 --download-superlu_dist=1<br>
>> [0]PETSC ERROR: ------------------------------------------------------------------------<br>
>> [0]PETSC ERROR: PCApply_FieldSplit() line 726 in /Users/anton/LIB/petsc-3.3-p0/src/ksp/pc/impls/fieldsplit/fieldsplit.c<br>
>> [0]PETSC ERROR: PCApply() line 384 in /Users/anton/LIB/petsc-3.3-p0/src/ksp/pc/interface/precon.c<br>
>> [0]PETSC ERROR: KSPFGMRESCycle() line 169 in /Users/anton/LIB/petsc-3.3-p0/src/ksp/ksp/impls/gmres/fgmres/fgmres.c<br>
>> [0]PETSC ERROR: KSPSolve_FGMRES() line 294 in /Users/anton/LIB/petsc-3.3-p0/src/ksp/ksp/impls/gmres/fgmres/fgmres.c<br>
>> [0]PETSC ERROR: KSPSolve() line 446 in /Users/anton/LIB/petsc-3.3-p0/src/ksp/ksp/interface/itfunc.c<br>
>> [0]PETSC ERROR: PCApply_FieldSplit_Schur() line 693 in /Users/anton/LIB/petsc-3.3-p0/src/ksp/pc/impls/fieldsplit/fieldsplit.c<br>
>> [0]PETSC ERROR: PCApply() line 384 in /Users/anton/LIB/petsc-3.3-p0/src/ksp/pc/interface/precon.c<br>
>> [0]PETSC ERROR: KSPSolve_GCR_cycle() line 47 in /Users/anton/LIB/petsc-3.3-p0/src/ksp/ksp/impls/gcr/gcr.c<br>
>> [0]PETSC ERROR: KSPSolve_GCR() line 117 in /Users/anton/LIB/petsc-3.3-p0/src/ksp/ksp/impls/gcr/gcr.c<br>
>> [0]PETSC ERROR: KSPSolve() line 446 in /Users/anton/LIB/petsc-3.3-p0/src/ksp/ksp/interface/itfunc.c<br>
>> [0]PETSC ERROR: solve_stokes_3d_coupled() line 2045 in src/ksp/ksp/examples/tutorials/ex42.c<br>
>> [0]PETSC ERROR: main() line 2106 in src/ksp/ksp/examples/tutorials/ex42.c<br>
>> application called MPI_Abort(MPI_COMM_WORLD, 1) - process 0<br>
>><br>
>> Similar error appeared in our code after upgrading to petsc-3.3, and we're using similar functionality and options as I posted above.<br>
>><br>
>> Please explain this issue. An advice how to get rid of the error is also appreciated.<br>
>><br>
>> Thanks a lot<br>
>><br>
>> Anton<br>
><br>
<br>
<br>
<br>
</div></div>-----------------------------------------------------------------------------<br>
Boris J.P. Kaus<br>
<br>
Institute of Geosciences &<br>
Center for Computational Sciences.<br>
University of Mainz, Mainz, Germany<br>
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<br>
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<br>
</blockquote></div><br>