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 - [email protected] ________________________________________ From: Kong, Fande <[email protected]> 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.; [email protected]; [email protected]; 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 <[email protected]<mailto:[email protected]>> wrote: Rob Falgout <[email protected]<mailto:[email protected]>> 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 ____________________________________________ hypre Issue Tracker <[email protected]<mailto:[email protected]>> <https://urldefense.proofpoint.com/v2/url?u=http-3A__cascb1.llnl.gov_hypre_issue1595&d=DwIFaQ&c=54IZrppPQZKX9mLzcGdPfFD1hxrcB__aEkJFOKJFd00&r=DUUt3SRGI0_JgtNaS3udV68GRkgV4ts7XKfj2opmiCY&m=3KsQjTxI8eRWrSIJtB3o9NlBc4bEuuP4HxiT-BlMx3U&s=FjvfvXD21bX8LA2TAD-J6MWCJyMNm0aameRp_9nfLYs&e=> ____________________________________________
