subdomains.mark(cell_domains, 1)
if MPI.size(mpi_comm_world()) == 1:
submesh = SubMesh(mesh, cell_domains, 1)
else:
submesh = create_submesh(mesh, cell_domains, 1)
#MPI.barrier(mpi_comm_world())
#continue
V = FunctionSpace(submesh, "CG", 2)
expr = Expression("x[0]*x[1]*x[1]+4*x[2]", degree=2)
u = project(expr, V)
MPI.barrier(mpi_comm_world())
s0 = submesh.size_global(0)
s3 = submesh.size_global(submesh.ufl_cell().topological_dimension())
a = assemble(u * dx)
v = assemble(Constant(1) * dx(domain=submesh))
if MPI.rank(mpi_comm_world()) == 0:
print("Num vertices: ", s0)
print("Num cells: ", s3)
print("assemble(u*dx): ", a)
print("Volume: ", v)
#u = Function(V)
#File("u.pvd") << u
#import ipdb; ipdb.set_trace()
#print mesh.num_cells()
#print dir(mesh)
#print mesh.cells()
