Re: reordering mesh/matrix

[Barry Smith <bsmith@mcs.anl.gov>]

On Sun, 12 Mar 2006, billy@dem.uminho.pt wrote:

> What is the best way to reorder an unstructured partitioned mesh for PETSc? I
> want to reduce the bandwidth of the mesh.
>
> I use reverse cuthill-mckee to reorder the mesh and then partition with metis.
> Then, I reorder again to PETSc style ordering.
  Billy,

   To my knowledge this is the best thing to do.

 Use metis/parmetis to decide
which elements/nodes belong to each process then get the data (geometry, 
connectivity, physical parameters etc) for each 
element/node to the process it belongs. Then RENUMBER the nodes so that the 
first
process owns the first set of nodes etc. Note that this renumbering is JUST
a relabeling of the "name" of each node, the decision of which nodes belong
to which process is determined by metis/parmetis.

  If this is what you are doing then you are doing what I would do.

   Barry

> Billy.