[petsc-users] Variable Block Row format in PETSc

[Jed Brown]

What kind of VBR matrix? What are you partitioning using parmetis? A mesh?
The blocks of the matrix? How do you create the entries in the matrix?
On May 14, 2013 4:36 PM, "Longxiang Chen" <suifengls at gmail.com> wrote:

> To whom it may concern,
>
> I use parmetis to partition a mesh for a sparse matrix.
> Then I distribute the data to the  appropriate processors according to the
> result of partition.
>
> The sparse matrix is stored in Variable Block Row(VBR) format.
> After the distribution, I want to call PETSc KSP solver to solve Ax = b.
> I tried to convert VBR to AIJ or CSR format, but the data would be
> re-distributed.
>
> The ideal method is to keep the distribution result from parmetis.
> For example, after parmetis, processor 0 has 0, 1, 4, and processor 1 has
> 2, 3, 5. I wish the PETSc would not change this distribution and solve Ax
> = b.
>
> Are there any approaches to call KSP solver in VBR format from PETSc?
> Or any suggestions for solving Ax = b?
>
> Thanks in advance.
>
> Regards,
> Longxiang Chen
>
>
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