[petsc-dev] [petsc-users] MatGetSubMatrices or VecCreateGhost

[Jed Brown]

"hong at aspiritech.org" <hong at aspiritech.org> writes:

> I'm writing MatTransposeMatMult_MPIDense_MPIDense() without elemental now
> (almost done).
>
> It would be nice to have MatConvert() between MPIDense and elemental [VC,*]
> - it seems we use elemental default (2D?).

Yeah.

> Jed: do you know how to set [VC,*] for MatConvert_mpidense_elemental?

Yes, see the El::MC,El::MR template parameters to DistMatrix.

However, we should probably update the Elemental interface to use the
newish Elemental C bindings, so the interface doesn't need to be C++.

> If we have MatConvert() without data movement, then we gain all dense
> operations supported by elemental.

True.
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