[petsc-users] MatMatMult involving MPIAIJ and MATNEST

[Bikash Kanungo]

Cool. Thank you all for your valuable suggestions.
On May 11, 2015 2:10 PM, "Jed Brown" <jed at jedbrown.org> wrote:

> Bikash Kanungo <bikash at umich.edu> writes:
>
> > So I guess, in terms of performance creating M^{-1} through
> > MatGetLocalSubMatrix and then explicitly build M^{-1}H is a more
> efficient
> > way.
>
> Yes, unless this destroys sparsity that would otherwise be exploitable.
>
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