Removed MPI direct dependency from ngsPETSc.

MPI should either come from NGSolve/Firedrake or FEniCSx.

Signed-off-by: Umberto Zerbinati <[email protected]>

ngsPETSc/eps.py

@@ -10,8 +10,6 @@
     warnings.warn("Import Warning: it was not possible to import SLEPc")
     SLEPc = None
 
-from mpi4py import MPI
-
 from ngsolve import GridFunction
 
 from ngsPETSc import Matrix, VectorMapping
@@ -41,7 +39,7 @@ class EigenSolver():
     if SLEPc is not None:
         def __init__(self, pencil, fes, nev, ncv=SLEPc.DECIDE, optionsPrefix=None,
                     solverParameters=None):
-            self.comm = MPI.COMM_WORLD
+            self.comm = PETSc.COMM_WORLD.tompi4py()
             if not isinstance(pencil, tuple): pencil=tuple([pencil])
             self.penLength = len(pencil)
             self.fes = fes

ngsPETSc/plex.py

@@ -17,8 +17,6 @@ class comp:
             "dummy class"
             Mesh = type(None)
 
-from mpi4py import MPI
-
 FACE_SETS_LABEL = "Face Sets"
 CELL_SETS_LABEL = "Cell Sets"
 EDGE_SETS_LABEL = "Edge Sets"
@@ -33,7 +31,7 @@ class MeshMapping:
 
     '''
 
-    def __init__(self, mesh=None, comm=MPI.COMM_WORLD, name="Default"):
+    def __init__(self, mesh=None, comm=PETSc.COMM_WORLD.tompi4py(), name="Default"):
         self.name = name
         self.comm = comm
         if isinstance(mesh,(ngs.comp.Mesh,ngm.Mesh)):

pyproject.toml

@@ -30,7 +30,6 @@ python = "^3.9"
 netgen-mesher = "^6.2"
 netgen-occt = "^7.8"
 petsc4py =  "^3.22.1"
-mpi4py = "^4"
 numpy = "^2"
 scipy = "^1"
 
@@ -40,6 +39,7 @@ pylint = "^3.3"
 
 [tool.poetry.group.ngsolve.dependencies]
 ngsolve = "^6.2"
+mpi4py = "^4"
 
 [build-system]
 requires = ["poetry-core"]