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

[Stephen Thomas]

---------- Forwarded message ---------
From: <trilinos-users-owner at software.sandia.gov>
Date: Tue, Jan 10, 2017 at 11:51 AM
Subject: serial (replicated) AMG V-cycle to extend strong scaling
To: <stephethomas at gmail.com>


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---------- Forwarded message ----------
From: Stephen Thomas <stephethomas at gmail.com>
To: trilinos-users at software.sandia.gov
Cc:
Date: Tue, 10 Jan 2017 11:49:09 -0700
Subject: serial (replicated) AMG V-cycle to extend strong scaling

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
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