> On Jun 24, 2018, at 11:15 AM, Mark Adams <[email protected]> wrote:
>
> First, -pc_gamg_threshold 0.8 is crazy. 0.08 is very high. probably best to
> start with 0.
>
> This threshold will delete all of your edges in the coarsening graph,
> probably, and GAMG will switch to a one level solve (silently although -info
> will tell you).
>
> And yes, this looks like a 64 bit indices problem, we have:
>
> #define GAMG_HASH(key) ((((PetscInt)7)*key)%a_tab->size)
>
> We should probably cast everything to (long long) or (unsigned PetscInt) I
> guess ... I'm not sure how this should be done exactly. Any ideas from the
> peanut gallery?
Mark,
It should only be changed if we know the exact mechanism that causes the
failure. It is not obvious to me that just changing
((((PetscInt)7)*key)%a_tab->size) to ((((PetscInt64)7)*key)%a_tab->size) should
matter.
Barry
>
>
>
> On Sun, Jun 24, 2018 at 2:34 AM Pierre Jolivet <[email protected]>
> wrote:
> Hello,
> Any ideas on how to debug this?
> [406]PETSC ERROR: key 328214936 not found in table
> [406]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for
> trouble shooting.
> [406]PETSC ERROR: Petsc Development GIT revision: v3.9.2-603-gceafe64 GIT
> Date: 2018-06-10 12:46:16 -0500
> [406]PETSC ERROR:
> /ccc/work/cont003/rndm/rndm/FreeFem-sources/src/mpi/FreeFem++-mpi on a
> arch-linux2-c-debug-bullxmpi named curie2698 by jolivetp Sun Jun 24 07:06:07
> 2018
> [406]PETSC ERROR: Configure options --with-scalar-type=real
> --with-hypre-dir=arch-linux2-c-opt-bullxmpi
> --with-metis-dir=arch-linux2-c-opt-bullxmpi
> --with-mumps-dir=arch-linux2-c-opt-bullxmpi --with-mkl_cpardiso=1
> --with-mkl_pardiso=1 --with-parmetis-dir=arch-linux2-c-opt-bullxmpi
> --with-ptscotch-dir=arch-linux2-c-opt-bullxmpi
> --with-sowing-dir=arch-linux2-c-opt-bullxmpi
> --with-blacs-include=/ccc/products/mkl-18.0.1.163/default/18.0.1.163/mkl/include
>
> --with-blacs-lib=/ccc/products/mkl-18.0.1.163/default/18.0.1.163/mkl/lib/intel64/libmkl_blacs_openmpi_lp64.so
>
> --with-blaslapack-dir=/ccc/products/mkl-18.0.1.163/default/18.0.1.163/mkl/lib/intel64
> --with-x=0 --with-debugging=1 --with-errorchecking=1
> --with-mkl_pardiso-dir=/ccc/products/mkl-18.0.1.163/default/18.0.1.163/mkl
> --with-mkl_cpardiso-dir=/ccc/products/mkl-18.0.1.163/default/18.0.1.163/mkl
> --with-scalapack-include=/ccc/products/mkl-18.0.1.163/default/18.0.1.163/mkl/include
>
> --with-scalapack-lib="[/ccc/products/mkl-18.0.1.163/default/18.0.1.163/mkl/lib/intel64/libmkl_scalapack_lp64.so,/ccc/products/mkl-18.0.1.163/default/18.0.1.163/mkl/lib/intel64/libmkl_blacs_openmpi_lp64.so]"
> --with-fortran-bindings=0 PETSC_ARCH=arch-linux2-c-debug-bullxmpi
> [406]PETSC ERROR: #1 PCGAMGHashTableFind() line 106 in
> /ccc/work/cont003/rndm/rndm/petsc/include/petsc/private/pcgamgimpl.h
> [406]PETSC ERROR: #2 smoothAggs() line 526 in
> /ccc/work/cont003/rndm/rndm/petsc/src/ksp/pc/impls/gamg/agg.c
> [406]PETSC ERROR: #3 PCGAMGCoarsen_AGG() line 970 in
> /ccc/work/cont003/rndm/rndm/petsc/src/ksp/pc/impls/gamg/agg.c
> [406]PETSC ERROR: #4 PCSetUp_GAMG() line 518 in
> /ccc/work/cont003/rndm/rndm/petsc/src/ksp/pc/impls/gamg/gamg.c
> [406]PETSC ERROR: #5 PCSetUp() line 932 in
> /ccc/work/cont003/rndm/rndm/petsc/src/ksp/pc/interface/precon.c
> [406]PETSC ERROR: #6 KSPSetUp() line 381 in
> /ccc/work/cont003/rndm/rndm/petsc/src/ksp/ksp/interface/itfunc.c
>
> For smaller problems, this works fine. Should I compile using 64 bit indices?
> I’m using -pc_type gamg -pc_gamg_threshold 0.8 -pc_gamg_agg_nsmooths 1
> -pc_gamg_sym_graph true -pc_gamg_square_graph 10
>
> Thanks,
> Pierre
