>>> That's good to keep in mind. PETSc performance (at least in the older
>>> versions where I've made this mistake) becomes atrocious if it's asked
>>> to create new non-zero matrix entries on the fly without
>>> preallocation.
>>
>> Presumably MatMatMult in PETSc (or the equivalent in trilinos)
On Mon, 17 Sep 2012, David Knezevic wrote:
> On 09/17/2012 01:33 PM, Roy Stogner wrote:
>> That's good to keep in mind. PETSc performance (at least in the older
>> versions where I've made this mistake) becomes atrocious if it's asked
>> to create new non-zero matrix entries on the fly without
>
On 09/17/2012 01:33 PM, Roy Stogner wrote:
> On Mon, 17 Sep 2012, John Peterson wrote:
>
>> On Mon, Sep 17, 2012 at 8:42 AM, Andrew E Slaughter
>> wrote:
>>> I need to multiply two SparseMatrix objects together, in parallel, does
>>> libMesh have this functionality?
>>>
>>> One possible solution
On Mon, 17 Sep 2012, John Peterson wrote:
> On Mon, Sep 17, 2012 at 8:42 AM, Andrew E Slaughter
> wrote:
>> I need to multiply two SparseMatrix objects together, in parallel, does
>> libMesh have this functionality?
>>
>> One possible solution is to use the PETSc MatMatMult function, but this
>>
On Mon, Sep 17, 2012 at 8:42 AM, Andrew E Slaughter
wrote:
> I need to multiply two SparseMatrix objects together, in parallel, does
> libMesh have this functionality?
>
> One possible solution is to use the PETSc MatMatMult function, but this
> requires that I use PetscMatrix objects, which I als
On Mon, 17 Sep 2012, Derek Gaston wrote:
> While that is probably true... we should probably enhance the SparseMatrix
> interface to handle mat*mat cases... maybe Andrew would be willing to
> supply a patch?! ;-)
I'd be thrilled to see that. PetscMatrix does give easy access to the
PETSc Mat,
While that is probably true... we should probably enhance the SparseMatrix
interface to handle mat*mat cases... maybe Andrew would be willing to
supply a patch?! ;-)
Derek
On Mon, Sep 17, 2012 at 8:48 AM, Kirk, Benjamin (JSC-EG311) <
benjamin.kir...@nasa.gov> wrote:
> Check the PETSC matrix libm
Check the PETSC matrix libmesh documentation - I think there is a method to
return the raw PETSC object.
I know there is for vectors anyway!
-Ben
On Sep 17, 2012, at 9:42 AM, "Andrew E Slaughter"
wrote:
> I need to multiply two SparseMatrix objects together, in parallel, does
> libMesh ha
I need to multiply two SparseMatrix objects together, in parallel, does
libMesh have this functionality?
One possible solution is to use the PETSc MatMatMult function, but this
requires that I use PetscMatrix objects, which I also cannot figure out how
to do. Can someone indicate how I can specify
