MeshDistribute() and Chaco

[Matthew Knepley]

1) Please send these to petsc-maint at mcs.anl.gov

On 6/14/07, Shi Jin <jinzishuai at yahoo.com> wrote:
> Hi,
>
> I am trying to study the new unstructured mesh part
> provided by the new Petsc. I have one particular
> question  with regard to the function call
> MeshDistribute(serialMesh, PETSC_NULL, &parallelMesh);

2) The PETSC_NULL can be used to specify another partitioner like "parmetis"

3) Not sure about the argument. You would have to refer to the package.

   Matt

> This call obviously needs the chaco package to run in
> parallel since otherwise I will get a warning to
> configure with --download-chaco.
> So I ran it with chaco installed. The code works but
> the domain decomposition is valid but far from good.
> In the attached image, I am showing the domain
> decomposition for  a 2-dimensional 1x1 box with two
> processes, using the following statements:
> MeshCreatePCICE(comm, 3,
> "bratu_2d.nodes","bratu_2d.lcon",PETSC_FALSE,PETSC_FALSE,
> &serialMesh);
> MeshDistribute(serialMesh, PETSC_NULL, &parallelMesh);
>
> I am wondering if it is possible to improve the domain
> decomposition by passing some command arguments. I
> realized that there are Chaco options such as
> -mat_partitioning_chaco_global (found at
> http://www-unix.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/MatOrderings/MAT_PARTITIONING_Chaco.html)
> . However, when I pass these options to my code, it is
> not recognized. I wonder how chaco is used in Petsc
> and how I can change its behavior.
>
> In addition, is it possible to use other graph
> decomposition packages such as ParMetis to implement
> MeshDistribute()? I tried to enable ParMetis without
> chaco but the code didn't run and warned me to install
> chaco.
>
> Any advice is valuable. Thank you very much.
>
> Shi
>
>
>
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