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Change solver in mixed Poisson #3558

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Change solver in mixed Poisson #3558

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649378c
Assert error in demo mixed poisson
jorgensd Dec 10, 2024
0bd3b3e
Switch to mumps
jorgensd Dec 10, 2024
96fb1c5
Pick solver based on integer-type
jorgensd Dec 10, 2024
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20 changes: 18 additions & 2 deletions python/demo/demo_mixed-poisson.py
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Original file line number Diff line number Diff line change
Expand Up @@ -112,7 +112,15 @@
from basix.ufl import element, mixed_element
from dolfinx import default_real_type, fem, io, mesh
from dolfinx.fem.petsc import LinearProblem
from ufl import Measure, SpatialCoordinate, TestFunctions, TrialFunctions, div, exp, inner
from ufl import (
Measure,
SpatialCoordinate,
TestFunctions,
TrialFunctions,
div,
exp,
inner,
)

msh = mesh.create_unit_square(MPI.COMM_WORLD, 32, 32, mesh.CellType.quadrilateral)

Expand Down Expand Up @@ -169,14 +177,22 @@ def f2(x):

bcs = [bc_top, bc_bottom]

# We choose the direct solver based on the integer type used in PETSc,
# as MUMPS has issues with 64-bit integers.
if PETSc.IntType == np.int32:
direct_solver = "mumps"
else:
direct_solver = "superlu_dist"

problem = LinearProblem(
a,
L,
bcs=bcs,
petsc_options={
"ksp_type": "preonly",
"pc_type": "lu",
"pc_factor_mat_solver_type": "superlu_dist",
"pc_factor_mat_solver_type": direct_solver,
"ksp_error_if_not_converged": True,
},
)
try:
Expand Down
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