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allow for ghost only mesh #3743

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Merged
ksagiyam merged 1 commit into from
Sep 10, 2024
Merged

allow for ghost only mesh #3743

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19 changes: 10 additions & 9 deletions firedrake/cython/dmcommon.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -2471,7 +2471,7 @@ def get_cell_remote_ranks(PETSc.DM plex):
:arg plex: The DMPlex object encapsulating the mesh topology
"""
cdef:
PetscInt cStart, cEnd, ncells, i
PetscInt cStart, cEnd, ncells, i, p
PETSc.SF sf
PetscInt nroots, nleaves
const PetscInt *ilocal = NULL
Expand All @@ -2487,8 +2487,9 @@ def get_cell_remote_ranks(PETSc.DM plex):
CHKERR(PetscSFGetGraph(sf.sf, &nroots, &nleaves, &ilocal, &iremote))

for i in range(nleaves):
if cStart <= ilocal[i] < cEnd:
result[ilocal[i] - cStart] = iremote[i].rank
p = ilocal[i] if ilocal else i
if cStart <= p < cEnd:
result[p - cStart] = iremote[i].rank

return result

Expand Down Expand Up @@ -3290,7 +3291,7 @@ def exchange_cell_orientations(
# Overwrite values in the halo region with remote values
get_height_stratum(plex.dm, 0, &cStart, &cEnd)
for i in range(nleaves):
c = ilocal[i]
c = ilocal[i] if ilocal else i
if cStart <= c < cEnd:
CHKERR(PetscSectionGetOffset(section.sec, c, &l))
CHKERR(PetscSectionGetOffset(new_section.sec, c, &r))
Expand Down Expand Up @@ -3430,7 +3431,7 @@ def set_adjacency_callback(PETSc.DM dm not None):
CHKERR(DMGetLabel(dm.dm, "ghost_region", &label))
get_chart(dm.dm, &pStart, &pEnd)
for p in range(nleaves):
CHKERR(DMLabelSetValue(label, ilocal[p], 1))
CHKERR(DMLabelSetValue(label, ilocal[p] if ilocal else p, 1))
CHKERR(DMLabelCreateIndex(label, pStart, pEnd))
CHKERR(DMPlexSetAdjacencyUser(dm.dm, DMPlexGetAdjacency_Facet_Support, NULL))

Expand Down Expand Up @@ -3479,7 +3480,7 @@ def compute_point_cone_global_sizes(PETSc.DM dm):
CHKERR(DMPlexGetConeSize(dm.dm, p, &coneSize))
arraySizes[1] += coneSize;
for i in range(nleaves):
CHKERR(DMPlexGetConeSize(dm.dm, ilocal[i], &coneSize))
CHKERR(DMPlexGetConeSize(dm.dm, ilocal[i] if ilocal else i, &coneSize))
arraySizes[1] -= coneSize;
out = np.zeros((2, ), dtype=IntType)
dm.comm.tompi4py().Allreduce(arraySizes, out, op=MPI.SUM)
Expand Down Expand Up @@ -3603,15 +3604,15 @@ def create_halo_exchange_sf(PETSc.DM dm):
n = 0
# ilocal == NULL if local leaf points are [0, 1, 2, ...).
for i in range(nleaves):
p = ilocal[i] if ilocal != NULL else i
p = ilocal[i] if ilocal else i
CHKERR(PetscSectionGetDof(local_sec.sec, p, &dof))
n += dof
CHKERR(PetscMalloc1(n, &dof_ilocal))
CHKERR(PetscMalloc1(n, &dof_iremote))
n = 0
for i in range(nleaves):
# ilocal == NULL if local leaf points are [0, 1, 2, ...).
p = ilocal[i] if ilocal != NULL else i
p = ilocal[i] if ilocal else i
assert remote_offsets[p] >= 0
CHKERR(PetscSectionGetDof(local_sec.sec, p, &dof))
CHKERR(PetscSectionGetOffset(local_sec.sec, p, &off))
Expand Down Expand Up @@ -3696,7 +3697,7 @@ def submesh_correct_entity_classes(PETSc.DM dm,
ownership_loss = np.zeros(pEnd - pStart, dtype=IntType)
ownership_gain = np.zeros(pEnd - pStart, dtype=IntType)
for i in range(nleaves):
p = ilocal[i] if ilocal != NULL else i
p = ilocal[i] if ilocal else i
ownership_loss[p] = 1
unit = MPI._typedict[np.dtype(IntType).char]
ownership_transfer_sf.reduceBegin(unit, ownership_loss, ownership_gain, MPI.REPLACE)
Expand Down