[petsc-users] MatMatMult involving MPIAIJ and MATNEST

[Jed Brown]

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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