[petsc-dev] [issue1595] Issues of limited number of MPI communicators when having many instances of hypre boomerAMG with Moose

[Li, Ruipeng]

Hi, Fande,

"For instance, if an application has multiple fields and each field will be solved by a HYPRE solver,  then we end up with  multiple hypre solves. The multiple hypre solves are not run simultaneously, instead, it will be run one-by-one. If we assign the same communicator to the multiple hypre solves, any potential tag conflict?"

In this scenario, is just the solve phase of BoomerAMG one after another, or also the setup of AMG? Since BoomerAMG takes the communicator from the A matrix, if the entire hypre solve (setup + solve) is serial, there should be no conflicts.

-Ruipeng

. -- .- .. .-.. / ..-. .-. --- -- / .-. ..- .. .--. . -. --. / .-.. ..
 Ruipeng Li
 Center for Applied Scientific Computing
 Lawrence Livermore National Laboratory
 P.O. Box 808, L-561
 Livermore, CA 94551
 phone - (925) 422-6037,  email - li50 at llnl.gov


________________________________________
From: Kong, Fande <fande.kong at inl.gov>
Sent: Tuesday, April 3, 2018 1:34 PM
To: hypre-support
Cc: Barry Smith; Derek Gaston; Li, Ruipeng; Osei-Kuffuor, Daniel; For users of the development version of PETSc; Schroder, Jacob B.; tzanio at llnl.gov; umyang at llnl.gov; Wang, Lu
Subject: Re: [issue1595] Issues of limited number of MPI communicators when having many instances of hypre boomerAMG with Moose



On Tue, Apr 3, 2018 at 2:12 PM, Rob Falgout hypre Tracker <hypre-support at llnl.gov<mailto:hypre-support at llnl.gov>> wrote:

Rob Falgout <rfalgout at llnl.gov<mailto:rfalgout at llnl.gov>> added the comment:

Hi Barry,

Can you explain the scenario where multiple hypre solves would be working in parallel with the same communicator?  Thanks!

Hi Rob,

For instance, if an application has multiple fields and each field will be solved by a HYPRE solver,  then we end up with  multiple hypre solves. The multiple hypre solves are not run simultaneously, instead, it will be run one-by-one. If we assign the same communicator to the multiple hypre solves, any potential tag conflict?

Fande,



-Rob

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hypre Issue Tracker <hypre-support at llnl.gov<mailto:hypre-support at llnl.gov>>
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