[petsc-users] GAMG setup scalability

[Jed Brown]

On Fri, Aug 17, 2012 at 9:59 AM, John Fettig <john.fettig at gmail.com> wrote:

> I'd be willing to live with the MatPtAP time, it is the
> MatTransposeMatMult time that is really poor.  Any idea why the latter
> is so slow?
>

Mark, for a symmetric graph, how about using MatMatMult() here? Even for a
non-symmetric problem, MatMatTransposeMult() is faster than
MatTransposeMatMult().
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