[petsc-users] Re-configuring PETSc

[Najeeb Ahmad]

Thanks a lot Satish for your prompt reply.

I just checked that SuperLU_dist package works only for matrices of type
aij. and uses lu preconditioner. I am currently working with baij matrix.
What is the best preconditioner choice for baij matrices on parallel
machines?

Thanks

On Mon, May 28, 2018 at 8:23 PM, Satish Balay <balay at mcs.anl.gov> wrote:

> 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.
> >
> >
>
>


-- 
*Najeeb Ahmad*


*Research and Teaching Assistant*
*PARallel and MultiCORE Computing Laboratory (ParCoreLab) *

*Computer Science and Engineering*
*Koç University, Istanbul, Turkey*
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