> Must call DMShellSetGlobalVector() or DMShellSetCreateGlobalVector() > [0]PETSC ERROR: #1 DMCreateGlobalVector_Shell() at > /Users/markadams/Codes/petsc/src/dm/impls/shell/dmshell.c:210
It looks like you have built a DMSHELL? You need to teach it how to generate global vectors since yours currently does not. Barry > On May 9, 2023, at 5:40 PM, Mark Adams <[email protected]> wrote: > > > > On Tue, May 9, 2023 at 3:01 PM Barry Smith <[email protected] > <mailto:[email protected]>> wrote: >> >> >>> On May 9, 2023, at 12:32 PM, Mark Adams <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> I have a MG hierarchy that I construct manually with DMRefine and >>> DMPlexExtrude. >>> >>> * The solver works great with chevy/sor but with chevy/sor it converges >>> slowly or I get indefinite PC errors from CG. And the eigen estimates in >>> cheby are really high, like 10-15. >> >> So with Cheby/SOR it works great but with the exact same options >> Cheby/SOR it behaves poorly? Are you using some quantum computer and NERSc? > > It turned out that I had the sign wrong on my Laplacian point function and so > the matrix was negative definite. I'm not sure what really happened exactly > but it is sort of behaving better. > It looks like my prolongation operator is garbage, the coarse grid correction > does nothing (cg/jacobi converges in a little less that the number of MG > iterations times the sum of pre and post smoothing steps), and the rows sums > of P are not 1. > Not sure what is going on there, but it is probably related to the DM > hierarchy not being constructed correctly.... >>> >>> * I tried turning galerkin=none and I got this error. >> >> This is because without Garkin it needs to restrict the current solution >> and then compute the coarse grid Jacobian. Since you did not provide a DM >> that has the ability to even generate coarse grid vectors the process can >> work. You need a DM that can provide the coarse grid vectors and restrict >> solutions. Did you forget to pass a DM to the solver? > > The DM does everything. Similar to many examples but I've been checking with > snes/tutorials/ex12.c today. > I do call: > PetscCall(DMSetCoarseDM(dmhierarchy[r], dmhierarchy[r-1])); > But I am missing something else that goes on in DMRefineHierarchy, which I > can't use because I am semi-coarsening. > I probably have to build a section on each DM or something, but I have bigger > fish to fry at this point. > > (I construct a 2D coarse grid, refine that a number of times and > DMPlexExtrude each one the same amount (number and distance), the extruded > direction is wrapped around a torus and made periodic. > The fine grid now looks like, and will eventually be, the grids that tokamak > codes use.) > > Thanks, > Mark > >>> >>> Any thoughts on either of these issues? >>> >>> Thanks, >>> Mark >>> >>> [0]PETSC ERROR: --------------------- Error Message >>> -------------------------------------------------------------- >>> [0]PETSC ERROR: Must call DMShellSetGlobalVector() or >>> DMShellSetCreateGlobalVector() >>> [0]PETSC ERROR: WARNING! There are option(s) set that were not used! Could >>> be the program crashed before they were used or a spelling mistake, etc! >>> [0]PETSC ERROR: Option left: name:-ksp_converged_reason (no value) >>> source: command line >>> [0]PETSC ERROR: Option left: name:-mg_levels_esteig_ksp_type value: cg >>> source: command line >>> [0]PETSC ERROR: Option left: name:-mg_levels_pc_type value: sor source: >>> command line >>> [0]PETSC ERROR: Option left: name:-options_left (no value) source: >>> command line >>> [0]PETSC ERROR: See https://petsc.org/release/faq/ for trouble shooting. >>> [0]PETSC ERROR: Petsc Development GIT revision: v3.19.1-224-g9ed82936d20 >>> GIT Date: 2023-05-07 12:33:48 -0400 >>> [0]PETSC ERROR: ./ex96 on a arch-macosx-gnu-O named MarksMac-302.local by >>> markadams Tue May 9 12:26:52 2023 >>> [0]PETSC ERROR: Configure options CFLAGS="-g -Wall" CXXFLAGS="-g -Wall" >>> COPTFLAGS=-O CXXOPTFLAGS=-O --with-cc=/usr/local/opt/llvm/bin/clang >>> --with-cxx=/usr/local/opt/llvm/bin/clang++ --download-mpich >>> --with-strict-petscerrorcode --download-triangle=1 --with-x=0 >>> --with-debugging=0 --download-hdf5=1 PETSC_ARCH=arch-macosx-gnu-O >>> [0]PETSC ERROR: #1 DMCreateGlobalVector_Shell() at >>> /Users/markadams/Codes/petsc/src/dm/impls/shell/dmshell.c:210 >>> [0]PETSC ERROR: #2 DMCreateGlobalVector() at >>> /Users/markadams/Codes/petsc/src/dm/interface/dm.c:1022 >>> [0]PETSC ERROR: #3 DMGetNamedGlobalVector() at >>> /Users/markadams/Codes/petsc/src/dm/interface/dmget.c:377 >>> [0]PETSC ERROR: #4 DMRestrictHook_SNESVecSol() at >>> /Users/markadams/Codes/petsc/src/snes/interface/snes.c:649 >>> [0]PETSC ERROR: #5 DMRestrict() at >>> /Users/markadams/Codes/petsc/src/dm/interface/dm.c:3407 >>> [0]PETSC ERROR: #6 PCSetUp_MG() at >>> /Users/markadams/Codes/petsc/src/ksp/pc/impls/mg/mg.c:1074 >>> [0]PETSC ERROR: #7 PCSetUp() at >>> /Users/markadams/Codes/petsc/src/ksp/pc/interface/precon.c:994 >>> [0]PETSC ERROR: #8 KSPSetUp() at >>> /Users/markadams/Codes/petsc/src/ksp/ksp/interface/itfunc.c:406 >>> [0]PETSC ERROR: #9 KSPSolve_Private() at >>> /Users/markadams/Codes/petsc/src/ksp/ksp/interface/itfunc.c:824 >>> [0]PETSC ERROR: #10 KSPSolve() at >>> /Users/markadams/Codes/petsc/src/ksp/ksp/interface/itfunc.c:1070 >>> [0]PETSC ERROR: #11 SNESSolve_KSPONLY() at >>> /Users/markadams/Codes/petsc/src/snes/impls/ksponly/ksponly.c:48 >>> [0]PETSC ERROR: #12 SNESSolve() at >>> /Users/markadams/Codes/petsc/src/snes/interface/snes.c:4663 >>> [0]PETSC ERROR: #13 main() at ex96.c:433 >>> >>> >>> >>
