[petsc-users] Re-configuring PETSc

[Satish Balay]

On Mon, 28 May 2018, Najeeb Ahmad 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.

yes - petsc has sequential LU - but you need superlu_dist/mumps for parallel lu.

> 
> I am wondering what is the best way to reconfigure Petsc to download and
> use the appropriate package to support PCILU?

Rerun configure with the additional option --download-superlu_dist=1.

You can do this with current PETSC_ARCH you are using [i.e reinstall
over the current build] - or use a different PETSC_ARCH - so both
builds exist and useable.

Satish

> 
> You advice is highly appreciated.
> 
>