Re: [Libmesh-users] pre-partitioning a big mesh

[Derek G. <fri...@gm...>]

splitter also has the ability to do M->N parittioning.  What this means is
that splitter itself can be run using MPI... and can generate partitions
for any number of processors.  In fact, you can give it a list of n_procs
you want it partition for and it will do all of them simultaneously.

If you have one handy I highly recommend running splitter on a cluster that
has a good parallel filesystem.

BTW: I've used splitter to split huge multi GB Exodus files up into ~20,000
or so partitions and it's been pretty solid.

Derek

On Wed, Jan 11, 2017 at 4:18 PM gmail <a.m...@gm...> wrote:

> Perfect. I will give it a try.
>
> Ata
> > On Jan 11, 2017, at 4:14 PM, John Peterson <jwp...@gm...> wrote:
> >
> >
> >
> > On Wed, Jan 11, 2017 at 2:04 PM, gmail <a.m...@gm... <mailto:
> a.m...@gm...>> wrote:
> > Hi John,
> >
> > This is the first time I see this. So I’m not sure what this .cpr format
> is?
> >
> > It's the CheckpointIO format.  It can write either binary or ASCII files
> and is similar to the xdr/a format that libmesh uses to write meshes in
> serial.  Only thing it can't really do is restart from N files on M procs,
> but that shouldn't affect your use case.
> >
> >
> > Can each processor read its own chunk using with mesh.read when libMesh
> is compiled with parallel mesh?
> >
> >
> > Yes, that's how it should work.  You can use one of the Partitioner
> classes that comes with libmesh, or partition the mesh yourself in some
> application-specific way.
> >
> > --
> > John
>
>
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