On Thu, Jul 16, 2015 at 8:18 PM, Michele Rosso wrote:
> Barry,
>
> thank you very much for the detailed answer. I tried what you suggested
> and it works.
> So far I tried on a small system but the final goal is to use it for very
> large runs. How does PCGAMG compares to PCMG as far as perf
>
>
>
> Yeah, gamg tries to put all the rows of the matrix on one process and
> leave the other processes empty,
Actually, GAMG does not do that anymore. But there are two parameters that
govern this and the defaults result in one active process on the coarse
grid: -pc_gamg_process_eq_limit
