[Trilinos-Users] [EXTERNAL] question about MueLu (AMG) setting

[Andrey Prokopenko]

Oh, I see. In order to use repartitioning at the moment you have to 
provide the physical coordinates of nodes corresponding to degrees of 
freedom of the matrix you pass to MueLu. We require that information as 
we use geometric partitioning to do rebalancing.

Do you have coordinates available? Also, how do you construct MueLu 
preconditioner? If it is through CreateTpetraPreconditioner, you can 
simply pass these coordinates as a 3rd argument.

-Andrey

On 07/10/2015 03:46 PM, Ouchi Hisanao wrote:
> Hi Andrey,
>
> Thank you very much for your reply.
>
> According to your advice, I modified my input deck based on a new 
> style (please see the bottom of my email) and simply add the following 
> sentence as you suggested.
>
> <Parameter name="repartition: enable" type="bool" value="true"/>
>
> However, I could not execute my code successfully since the following 
> error message appeared.
>
> -------------- ---------------------------- error messeage 
> -------------------------------------------
> terminate called after throwing an instance of 
> 'MueLu::Exceptions::RuntimeError'
>   what():  CoordinatesTransferFactory::DeclareInput: (LevelID = 0) 
> unable to find or generate requested data "Coordinates" with 
> generating factory "null"
>     during request for data "    Coordinates" on level 0 by factory 
> CoordinatesTransferFactory
>     during request for data "    Coordinates" on level 1 by factory 
> RebalanceTransferFactory
>     during request for data "              P" on level 1 by factory 
> NoFactory
> -----------------------------------------------------------------------------------------------------------
>
> This error message appears not only in my program in my Ubuntu but 
> also in the sample code in the MueLu virtual machine image distributed 
> by Sandia as a tutorial. In the case of the MueLu virtual machine 
> image, I just added the following sentence in the simplest example 
> input deck  (n1_easy.xml) and executed the simplest example problem in 
> the MueLu tutorial (Laplace 2D 50x50).
>
> <Parameter name="repartition: enable" type="bool" value="true"/>
>
> Do you have any idea to resolve this error?
>
> Best regards,
>
> Hisanao
>
> ----------------------------- modified input deck 
> -------------------------------------
> <ParameterList name="MueLu">
>
> <Parameter name="verbosity" type="string" value="high"/>
>
> <Parameter name="max levels" type="int" value="10"/>
> <Parameter name="coarse: max size" type="int" value="10"/>
>
> <Parameter name="multigrid algorithm" type="string" value="sa"/>
> <Parameter name="sa: damping factor"  type="double" value="1.0"/>
>
>   <!-- Smoothing -->
>   <!-- Comment/uncomment different sections to try different smoothers -->
> <Parameter name="smoother: type" type="string" value="ILUT"/>
>  <!-- Rebalancing -->
> <Parameter name="repartition: enable" type="bool" value="true"/>
>
>   <!-- Aggregation -->
> <Parameter name="aggregation: type" type="string" value="uncoupled"/>
> <Parameter name="aggregation: min agg size" type="int" value="4"/>
>
> </ParameterList>
>
>
>
>
>



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