[petsc-users] dynamic matrix type & dense matrix.

[Matthew Knepley]

On Mon, Aug 25, 2014 at 9:49 AM, Mark Adams <mfadams at lbl.gov> wrote:

> I have a matrix that is logically dense and I create it like this:
>
>            call MatCreate(solver%comm,solver%schur,ierr);
>            call
> MatSetSizes(solver%schur,nloc,nloc,PETSC_DECIDE,PETSC_DECIDE,ierr)
>            call MatSetType(solver%schur,MATAIJ,ierr)
>            call
> MatSeqAIJSetPreallocation(solver%schur,nloc,PETSC_NULL_INTEGER,ierr)
>            call
> MatMPIAIJSetPreallocation(solver%schur,nloc,PETSC_NULL_INTEGER,i,PETSC_NULL_INTEGER,ierr)
>            !call MatSetFromOptions(solver%schur,ierr)
>

Send the full error from

           call MatCreate(solver%comm,solver%schur,ierr);
           call
MatSetSizes(solver%schur,nloc,nloc,PETSC_DECIDE,PETSC_DECIDE,ierr)
           call MatSetFromOptions(solver%schur,ierr)
           call MatSetUp(solver%schur, ierr)

  Thanks,

     Matt


> This works but if I uncomment MatSetFromOptions, and comment out the AIJ
> lines, and have '-mat_type dense' I get an error that the row is too large.
>  I can see from the trace that this happens in MatSetValues_MPIDense.  If I
> don't comment out the AIJ calls then I get a segv in MatSetValues, that is
> called from MatSetValues_MPIDense.  It segvs on the first line that uses
> the 'mat' so it looks like it is being called with garbage.
>
> Any ideas?
> Mark
>



-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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