[petsc-users] ParMETIS vs. CHACO when no partitioning is made

[Eda Oktay]

Dear Barry,

Thank you for answering. I am sending a sample code and a binary file.

Thanks!

Eda

Barry Smith <bsmith at petsc.dev>, 14 Ağu 2020 Cum, 18:49 tarihinde şunu yazdı:

>
>    Could be a bug in Chaco or its call from PETSc for the special case of
> one process. Could you send a sample code that demonstrates the problem?
>
>   Barry
>
>
> > On Aug 14, 2020, at 8:53 AM, Eda Oktay <eda.oktay at metu.edu.tr> wrote:
> >
> > Hi all,
> >
> > I am trying to try something. I am using the same MatPartitioning codes
> for both CHACO and ParMETIS:
> >
> > ierr =
> MatConvert(SymmA,MATMPIADJ,MAT_INITIAL_MATRIX,&AL);CHKERRQ(ierr);
> >   ierr = MatPartitioningCreate(MPI_COMM_WORLD,&part);CHKERRQ(ierr);
> >   ierr = MatPartitioningSetAdjacency(part,AL);CHKERRQ(ierr);
> >
> >   ierr = MatPartitioningSetFromOptions(part);CHKERRQ(ierr);
> >   ierr = MatPartitioningApply(part,&partitioning);CHKERRQ(ierr);
> >
> > After obtaining the IS, I apply this to my original nonsymmetric matrix
> and try to get an approximate edge cut.
> >
> > Except for 1 partitioning, my program completely works for 2,4 and 16
> partitionings. However, for 1, ParMETIS gives results where CHACO I guess
> doesn't since I am getting errors about the index set.
> >
> > What is the difference between CHACO and ParMETIS that one works for 1
> partitioning and one doesn't?
> >
> > Thanks!
> >
> > Eda
>
>
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