[petsc-users] repartition for dynamic load balancing

[Xiangdong]

What functions/tools can I use for dynamic migration in DMPlex framework?

Can you also name some external mesh management systems? Thanks.

Xiangdong

On Thu, Jan 28, 2016 at 12:21 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
> > On Jan 28, 2016, at 11:11 AM, Xiangdong <epscodes at gmail.com> wrote:
> >
> > Yes, it can be either DMDA or DMPlex. For example, I have 1D DMDA with
> Nx=10 and np=2. At the beginning each processor owns 5 cells. After some
> simulation time, I found that repartition the 10 cells into 3 and 7 is
> better for load balancing. Is there an easy/efficient way to migrate data
> from one partition to another partition? I am wondering whether there are
> some functions or libraries help me manage this redistribution.
>
>   For DMDA we don't provide tools for doing this, nor do we expect to. For
> this type of need for dynamic migration we recommend using DMPlex or some
> external mesh management system.
>
>   Barry
>
> >
> > Thanks.
> > Xiangdong
> >
> > On Thu, Jan 28, 2016 at 12:20 AM, Jed Brown <jed at jedbrown.org> wrote:
> > Xiangdong <epscodes at gmail.com> writes:
> >
> > > I have a question on dynamic load balance in petsc. I started running a
> > > simulation with one partition. As the simulation goes on, that
> partition
> > > may lead to load imbalance since it is a non-steady problem. If it is
> worth
> > > to perform the load balance, is there an easy way to re-partition the
> mesh
> > > and continue the simulation?
> >
> > Are you using a PETSc DM?  What "mesh"?  If you own it, then
> > repartitioning it is entirely your business.
> >
> > In general, after adapting the mesh, you rebuild all algebraic data
> > structures.  Solvers can be reset (SNESReset, etc.).
> >
>
>
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