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AuxiliaryPC with user provided Mats #35

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31 changes: 31 additions & 0 deletions petsctools/pc.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import abc
from .exceptions import PetscToolsException
from .options import _validate_prefix


class PCBase(abc.ABC):
Expand Down Expand Up @@ -153,3 +154,33 @@ def view(self, pc, viewer=None):
pcname = f"{type(self).__module__}.{type(self).__name__}"
viewer.printfASCII(
f"Python type preconditioner {pcname}\n")


class AuxiliaryPC(PCBase):
prefix = "aux"

def initialize(self, pc):
from petsc4py import PETSc
A, P = self.get_mats(pc)
ksp = PETSc.KSP().create(comm=pc.comm)
ksp.setOperators(A, P or A)
ksp.setOptionsPrefix(
_validate_prefix((pc.getOptionsPrefix() or "") + self.prefix)
)
ksp.setFromOptions()
self.ksp = ksp

def update(self, pc):
A, P = self.ksp.getOperators()
A.assemble()
if P is not A:
P.assemble()

def apply(self, pc, x, y):
self.ksp.solve(x, y)

def applyTranspose(self, pc, x, y):
self.ksp.solveTranspose(x, y)

def mats(self, pc):
return pc.getOperators()
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