[Trilinos-Users] serial (replicated) AMG V-cycle to extend strong scaling

Jonathan Hu jhu at sandia.gov
Wed Jan 11 12:53:13 EST 2017


Stephen Thomas wrote on 01/10/2017 10:53 AM:
> I have a general question about strong scaling for Trilinos
> based solvers employing AMG (MueLu) as the preconditioner
> (for example).
>
> Would it be possible or has the Trilinos group explored
> a cut-off point in the V-cycle, where the coarser levels
> are all duplicated and run in serial on the processor
> nodes - to reduce communication and extend strong scaling ?
>
> thanks
> Steve

Steve,

     We're certainly interested in such an approach and the advantages 
that it might have (e.g., reducing comunication), but we haven't had 
sufficient resources to try this out in MueLu. Currently we drop 
processors out of the communicator as the hierarchy is coarsened.

Regards,
Jonathan Hu
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