> you need to not attach any > coordinates to your DMDA and it should work. See for example > src/ksp/ksp/examples/tutorials/ex32.c
You mean, I should omit the call to DMDASetUniformCoordinates, right? This means, that my Paraview files will have no domain size info anymore. I will try it tomorrow and come back to you with the results. Thank you! Henrik > > Barry > > Sorry about this, someone needs to fix the injection for Q0 case. > > > > On Jan 9, 2018, at 9:12 AM, Buesing, Henrik <[email protected] > aachen.de> wrote: > > > > 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_BO > UNDARY_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_ru > n > > /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/preco > > n.c [0]PETSC ERROR: #8 KSPSetUp() line 381 in > > /rwthfs/rz/cluster/work/hb111949/Code/petsc/src/ksp/ksp/interface/itfu > > nc.c [0]PETSC ERROR: #9 KSPSolve() line 612 in > > /rwthfs/rz/cluster/work/hb111949/Code/petsc/src/ksp/ksp/interface/itfu > > nc.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 > > [email protected] > > ------------------------------------------------------ > > > >> -----Ursprüngliche Nachricht----- > >> Von: Smith, Barry F. [mailto:[email protected]] > >> Gesendet: 09 January 2018 15:10 > >> An: Buesing, Henrik <[email protected]> > >> Cc: petsc-users <[email protected]> > >> 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 <[email protected] > >> 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 > >>> [email protected] > >>> ------------------------------------------------------ > >
