[petsc-users] Geometric multigrid with a cell-centered discretization
Buesing, Henrik
hbuesing at eonerc.rwth-aachen.de
Tue Jan 9 09:12:49 CST 2018
Sorry (again), for posting only part of the error message...
So, here it comes. I will first [1] show the code snippets I am using, then second [2] I will show the PETSc options, and finally [3] the error message I get.
The grid is 1536 x 1 x 256 in x,y,z-direction. Thus, we see the first level of coarsening in x-direction here.
Thank you!
Henrik
[1]
CALL DMDACreate3d(PETSC_COMM_WORLD,DM_BOUNDARY_GHOSTED,DM_BOUNDARY_GHOSTED,DM_BOUNDARY_GHOSTED,&
DMDA_STENCIL_STAR, I0g,J0g,K0g, PETSC_DECIDE, PETSC_DECIDE,PETSC_DECIDE, petsc_two, petsc_one, &
PETSC_NULL_INTEGER,PETSC_NULL_INTEGER,PETSC_NULL_INTEGER, petsc_da, petsc_ierr)
CALL DMSetUp(petsc_da,petsc_ierr)
...
CALL DMSetFromOptions(petsc_da, petsc_ierr)
CALL DMDASetInterpolationType(petsc_da, DMDA_Q0, petsc_ierr)
CALL SNESSetDM(petsc_snes, petsc_da, petsc_ierr)
CALL SNESSetFromOptions(petsc_snes,petsc_ierr)
[2] -snes_monitor -snes_linesearch_monitor -snes_type newtonls -snes_linesearch_type basic -ksp_type fgmres -ksp_max_it 1000 -snes_stol 1e-06 -snes_rtol 1e-06 -snes_atol 1e-6 -ksp_gmres_restart 100 -ksp_monitor -pc_type mg -da_refine_y 1 -ksp_converged_reason -snes_converged_reason -ksp_monitor -ksp_view -pc_mg_levels 2 -options_left
[3]
[0]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
[0]PETSC ERROR: Arguments are incompatible
[0]PETSC ERROR: Ratio between levels: (mx - 1)/(Mx - 1) must be integer: mx 1536 Mx 768
[0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting.
[0]PETSC ERROR: Petsc Development GIT revision: v3.8.2-48-g851ec02 GIT Date: 2017-12-05 09:52:17 -0600
[0]PETSC ERROR: /rwthfs/rz/cluster/work/hb111949/EoCoE/aixcelerate17/gge_gnu/bench_run/000023/000000_copy_sub_launch/work/shem_fw64gnu_const.x on a gnu_openmpi named linuxbmc0008.rz.RWTH-Aachen.DE by hb111949 Tue Jan 9 16:04:39 2018
[0]PETSC ERROR: Configure options --download-fblaslapack --with-cc=mpicc -with-fc=mpif90 --with-cxx=mpicxx --download-hypre --download-superlu_dist --download-suitesparse --download-scalapack --download-blacs --download-hdf5 --download-parmetis --download-metis --with-debugging=0 --download-mumps
[0]PETSC ERROR: #1 DMCreateInjection_DA_3D() line 1195 in /rwthfs/rz/cluster/work/hb111949/Code/petsc/src/dm/impls/da/dainterp.c
[0]PETSC ERROR: #2 DMCreateInjection_DA() line 1283 in /rwthfs/rz/cluster/work/hb111949/Code/petsc/src/dm/impls/da/dainterp.c
[0]PETSC ERROR: #3 DMCreateInjection() line 1082 in /rwthfs/rz/cluster/work/hb111949/Code/petsc/src/dm/interface/dm.c
[0]PETSC ERROR: #4 DMCoarsen_DA() line 1219 in /rwthfs/rz/cluster/work/hb111949/Code/petsc/src/dm/impls/da/da.c
[0]PETSC ERROR: #5 DMCoarsen() line 2427 in /rwthfs/rz/cluster/work/hb111949/Code/petsc/src/dm/interface/dm.c
[0]PETSC ERROR: #6 PCSetUp_MG() line 618 in /rwthfs/rz/cluster/work/hb111949/Code/petsc/src/ksp/pc/impls/mg/mg.c
[0]PETSC ERROR: #7 PCSetUp() line 924 in /rwthfs/rz/cluster/work/hb111949/Code/petsc/src/ksp/pc/interface/precon.c
[0]PETSC ERROR: #8 KSPSetUp() line 381 in /rwthfs/rz/cluster/work/hb111949/Code/petsc/src/ksp/ksp/interface/itfunc.c
[0]PETSC ERROR: #9 KSPSolve() line 612 in /rwthfs/rz/cluster/work/hb111949/Code/petsc/src/ksp/ksp/interface/itfunc.c
[0]PETSC ERROR: [1]PETSC ERROR: --------------------- Error Message --------------------------------------------------------------
--
Dipl.-Math. Henrik Büsing
Institute for Applied Geophysics and Geothermal Energy
E.ON Energy Research Center
RWTH Aachen University
------------------------------------------------------
Mathieustr. 10 | Tel +49 (0)241 80 49907
52074 Aachen, Germany | Fax +49 (0)241 80 49889
------------------------------------------------------
http://www.eonerc.rwth-aachen.de/GGE
hbuesing at eonerc.rwth-aachen.de
------------------------------------------------------
> -----Ursprüngliche Nachricht-----
> Von: Smith, Barry F. [mailto:bsmith at mcs.anl.gov]
> Gesendet: 09 January 2018 15:10
> An: Buesing, Henrik <hbuesing at eonerc.rwth-aachen.de>
> Cc: petsc-users <petsc-users at mcs.anl.gov>
> Betreff: Re: [petsc-users] Geometric multigrid with a cell-centered
> discretization
>
>
> With cell centered elements each element is sliced in half in each of
> the three directions for refinement (or you can refine only in 1 or 2 of
> the dimensions if you like). This means that the ratio of mx to MX needs
> to be 2 (or 4).So your numbers are fine.
>
> > On Jan 9, 2018, at 7:59 AM, Buesing, Henrik <hbuesing at eonerc.rwth-
> aachen.de> wrote:
> >
> > Dear all,
> >
> > I am using DMDACreate3d to generate my domain and a cell-centered
> > two-point flux approximation as discretization. I use geometric
> > Multigrid (-pc_type mg) with DMDASetInterpolationType(petsc_da,
> > DMDA_Q0, petsc_ierr). With DM_BOUNDARY_GHOSTED as boundary type in
> > DMDACreate3d, I get
> >
> > [0]PETSC ERROR: Arguments are incompatible [0]PETSC ERROR: Ratio
> > between levels: (mx - 1)/(Mx - 1) must be integer: mx 1536 Mx 768
>
> We need ALL the output from the error (always). It should never be
> doing this check in your case so something is wrong with the order of
> your code perhaps.
>
> Barry
>
> >
> > With DM_BOUNDARY_PERIODIC, I get invalid accesses when I assemble the
> matrix.
> >
> > Can I somehow tell him, that I have a cell-centered grid, or do I have
> to resort to using N+1 in my dimensions?
> >
> > Thank you!
> > Henrik
> >
> >
> > --
> > Dipl.-Math. Henrik Büsing
> > Institute for Applied Geophysics and Geothermal Energy E.ON Energy
> > Research Center RWTH Aachen University
> > ------------------------------------------------------
> > Mathieustr. 10 | Tel +49 (0)241 80 49907
> > 52074 Aachen, Germany | Fax +49 (0)241 80 49889
> > ------------------------------------------------------
> > http://www.eonerc.rwth-aachen.de/GGE
> > hbuesing at eonerc.rwth-aachen.de
> > ------------------------------------------------------
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