leave my rows alone

[Matthew Knepley]

On 8/16/06, Thomas Geenen <geenen at gmail.com> wrote:
> dear petsc users,
>
> is there a way to prevent Petsc during the assembly phase from redistributing
> matrix rows over cpu's ?? i like the way the rows are assigned to the cpu's
> during the setvalues phase.

Actually,  the layout of a matrix is fully determined after MatSetSizes(), or
equivalently MatCreate***(). We do not redistribute at assembly.

setValues() will take values for any row, and send it to the correct
process. The
matrix layouts we support all have contiguous row on each proc. You can set the
sizes on creation.

  Does this answer your question?

  Thanks,

     Matt

> apparently petsc assigns the first nrows to cpu0 the second nrows to cpu1 etc.
> I could of course renumber my matrix but I would rather convince petsc that it
> should keep the distribution of the matrix rows.
>
> tia
> Thomas
>
>


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