[Dune] Repartitioning/dynamic load balancing in Dune

[Dedner, Andreas]

> 3) Does anyone have accessible/shareable application or testing code that uses dynamic load balancing via the dune grid interface? Ideally not using ParMETIS but e.g. Scotch or something else.

I forgot to mention: in dune-alugrid/examples/loadbalance
there are some example of how to implement a loadbalancer from the outside and one example uses Zoltan - which might work for you.
Andreas
________________________________
From: Dune <dune-bounces at lists.dune-project.org> on behalf of Oliver Sander <oliver.sander at tu-dresden.de>
Sent: 14 May 2020 09:10
To: dune at lists.dune-project.org <dune at lists.dune-project.org>
Subject: Re: [Dune] Repartitioning/dynamic load balancing in Dune

Hi Timo,

> 1) Is the way implemented in the loadbalance test in dune-grid the way to currently do dynamic load balancing and will it work for dune-uggrid and dune-alugrid? Possible restrictions?

no, that is only for UGGrid.

As Andreas said, UGGrid wants a vector of element target ranks, and ALUGrid uses a call-back.
So currently your code has to target one grid or the other, specifically.

> 2) What is the rational behind the new “repartition” interface and which problems will it solve?

I don't remember the discussion, but I suppose the aim was to unify the two interface mentioned above.

Indeed, I have not strong preference for the UGGrid interface at all -- it just seemed easiest
to me at the time.  If we reach a consensus to use something else I'll by happy to change it.

> 3) Does anyone have accessible/shareable application or testing code that uses dynamic load balancing via the dune grid interface? Ideally not using ParMETIS but e.g. Scotch or something else.

You don't need any particular partitioner at all for UGGrid load-balancing.
Just get a vector of desired target ranks for each element somehow,
and give that to the loadBalance method.

That being said, that part of UGGrid has seen little testing, and you may encounter bugs...

In particular, I suspect that even UG posed some restrictions on how elements can be
distributed, but that is not documented anywhere.  Peter is most likely to know anything
about this.

Best,
Oliver

>
> Already thanks for any answers in advance!
>
> Timo
>
>
> --
> _________________________________________________
>
> Timo Koch                                      phone: +49 711 685 64676
> IWS, Universität Stuttgart                  fax:   +49 711 685 60430
> Pfaffenwaldring 61         email: timo.koch at iws.uni-stuttgart.de <mailto:timo.koch at iws.uni-stuttgart.de>
> D-70569 Stuttgart             url: www.iws.uni-stuttgart.de/en/lh2/<http://www.iws.uni-stuttgart.de/en/lh2/> <http://www.iws.uni-stuttgart.de/en/lh2/>
> _________________________________________________
>
>
> _______________________________________________
> Dune mailing list
> Dune at lists.dune-project.org
> https://lists.dune-project.org/mailman/listinfo/dune
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.dune-project.org/pipermail/dune/attachments/20200514/32f139e0/attachment.htm>