[petsc-users] Partitioning a mesh with petsc4py

[Javier Quinteros]

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Hi all.
We use petsc4py to develop. We are trying to partition a mesh (DMPlex)
but we receive different errors when calling to the "distribute"
method of the "DMPlex" class.

We use versions 3.6 from PETSc and petsc4py.
We run it in two different installations. One has been installed with
- --download-metis and the other with --download-chaco, but the error is
always:

  File "PETSc/DMPlex.pyx", line 514, in
petsc4py.PETSc.DMPlex.distribute (src/petsc4py.PETSc.c:220066)
    self.dm.distribute()
  File "PETSc/DMPlex.pyx", line 514, in
petsc4py.PETSc.DMPlex.distribute (src/petsc4py.PETSc.c:220066)
petsc4py.PETSc.Errorpetsc4py.PETSc.Error: error code 56
[0] DMPlexDistribute() line 1505 in
/home/javier/soft/petsc-3.6.0/src/dm/impls/plex/plexdistribute.c
[0] PetscPartitionerPartition() line 653 in
/home/javier/soft/petsc-3.6.0/src/dm/impls/plex/plexpartition.c
[0] PetscPartitionerPartition_Chaco() line 1048 in
/home/javier/soft/petsc-3.6.0/src/dm/impls/plex/plexpartition.c
[0] No support for this operation for this object type
[0] Mesh partitioning needs external package support.
Please reconfigure with --download-chaco.

We build our mesh using "createFromCellList" as in firedrake (plex is
empty on ranks different than 0), and there is the folowwing comment:

# Provide empty plex on other ranks
# A subsequent call to plex.distribute() takes care of parallel
# partitioning

But for us is not working.

Does anyone have a working example of how to partition a mesh in petsc4py?

Thanks in advance!

- -- 
Javier Quinteros
- -------------------------------------------
2.4/Seismologie
Tel.: +49 (0)331/288-1931
Fax:  +49 (0)331/288-1277
Email: javier at gfz-potsdam.de
___________________________________

Helmholtz-Zentrum Potsdam
Deutsches GeoForschungsZentrum GFZ
Stiftung des öff. Rechts Land Brandenburg
Telegrafenberg, 14473 Potsdam
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