[petsc-users] Re-configuring PETSc

[Satish Balay]

I guess you would have to switch to AIJ format for superlu_dist.

[superlu_dist internally has its own format - so there is a conversion there anyway]

Satish

On Mon, 28 May 2018, Najeeb Ahmad wrote:

> 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.
> > >
> > >
> >
> >
> 
> 
>