Mark, I saw your configuration has hypre. If you could run with master, you may try -matptap_via hypre. It uses BoomerAMGBuildCoarseOperator directly with the AIJ matrices.
Stefano > On Feb 2, 2017, at 7:28 PM, Mark Adams <[email protected]> wrote: > > > > On Thu, Feb 2, 2017 at 11:13 AM, Hong <[email protected] > <mailto:[email protected]>> wrote: > Mark: > Try '-matmatmult_via scalable' first. If this works, should we set it as > default? > > If it is robust I would say yes unless it is noticeably slower (say >20%) > small scale problems. >
