> On May 28, 2018, at 9:58 AM, Najeeb Ahmad <[email protected]> wrote:
>
> Hi All,
>
> I have Petsc release version 3.9.2 configured with the following options:
>
> Configure options --with-cc=mpiicc --with-cxx=mpiicpc --with-fc=mpiifort
> --download-fblaslapack=1
>
> Now I want to use PCILU in my code and when I set the PC type to PCILU in the
> code, I get the following error:
>
> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [0]PETSC ERROR: See
> http://www.mcs.anl.gov/petsc/documentation/linearsolvertable.html for
> possible LU and Cholesky solvers
> [0]PETSC ERROR: Could not locate a solver package. Perhaps you must
> ./configure with --download-<package>
> [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html for
> trouble shooting.
> [0]PETSC ERROR: Petsc Release Version 3.9.2, unknown
> [0]PETSC ERROR: ./main on a arch-linux2-c-debug named Karachi by nahmad Mon
> May 28 17:52:41 2018
> [0]PETSC ERROR: Configure options --with-cc=mpiicc --with-cxx=mpiicpc
> --with-fc=mpiifort --download-fblaslapack=1
> [0]PETSC ERROR: #1 MatGetFactor() line 4318 in
> /home/nahmad/PETSc/petsc/src/mat/interface/matrix.c
> [0]PETSC ERROR: #2 PCSetUp_ILU() line 142 in
> /home/nahmad/PETSc/petsc/src/ksp/pc/impls/factor/ilu/ilu.c
> [0]PETSC ERROR: #3 PCSetUp() line 923 in
> /home/nahmad/PETSc/petsc/src/ksp/pc/interface/precon.c
> [0]PETSC ERROR: #4 KSPSetUp() line 381 in
> /home/nahmad/PETSc/petsc/src/ksp/ksp/interface/itfunc.c
> [0]PETSC ERROR: #5 KSPSolve() line 612 in
> /home/nahmad/PETSc/petsc/src/ksp/ksp/interface/itfunc.c
> [0]PETSC ERROR: #6 SolveSystem() line 60 in
> /home/nahmad/Aramco/petsc/petsc/BlockSolveTest/src/main.c
>
>
> I assume that I am missing LU package like SuperLU_dist for instance and I
> need to download and configure it with Petsc.
>
> I am wondering what is the best way to reconfigure Petsc to download and use
> the appropriate package to support PCILU?
There is no support for parallel ILU in PETSc (or with its external
packages). You can use -pc_type bjacobi or -pc_type asm and -sub_pc_type ilu
and get block Jacobi or overlapping additive Schwarz with ILU on each block
(which is "sort of" a parallel ILU).
Barry
>
> You advice is highly appreciated.
>
> --
> Najeeb Ahmad
>
> Research and Teaching Assistant
> PARallel and MultiCORE Computing Laboratory (ParCoreLab)
> Computer Science and Engineering
> Koç University, Istanbul, Turkey
>
