This looks like a problem with your MPI/DOLFIN installation, not the script itself.
What happens when you write python -c "import dolfin" ? -- Anders On Fri, May 14, 2010 at 04:06:24PM +0200, Lorenzo Isella wrote: > Dear All, > I have recently installed fenics on my machine (Ubuntu 9.10 amd64 > architecture), following the instructions at > > http://www.fenics.org/wiki/Download > > > However, when I try running the first example script from the > excellent tutorial > > http://www.fenics.org/pub/documents/fenics/tutorial/fenics-tutorial.pdf > > which I paste at the end of the email (saved as fenics-test.py), > this is the output I get > > > $ python fenics-test.py > Fatal error in MPI_Comm_size: Invalid communicator, error stack: > MPI_Comm_size(111): MPI_Comm_size(comm=0x227101c0, > size=0x7fff9ea355ec) failed > MPI_Comm_size(69).: Invalid communicator > > I am using a multicore machine and it looks like that something > related to MPI is a problem. > I am not really knowledgeable about parallelization and I am not > interested (as for now) in running fenics in parallel, but I simply > would like to be able to play a bit with this example script. > Any help is really appreciated. > Cheers > > Lorenzo > > #################################################### > > > from dolfin import * > # Create mesh and define function space > mesh = UnitSquare(6, 4) > V = FunctionSpace(mesh, "CG", 1) > # Define boundary conditions > u0 = Expression("1 + x[0]*x[0] + 2*x[1]*x[1]", V=V) > class Boundary(SubDomain): # define the Dirichlet boundary > def inside(self, x, on_boundary): > return on_boundary > u0_boundary = Boundary() > bc = DirichletBC(V, u0, u0_boundary) > # Define variational problem > v = TestFunction(V) > u = TrialFunction(V) > f = Constant(mesh, -6.0) > a = dot(grad(u), grad(v))*dx > L = f*v*dx > # Compute solution > problem = VariationalProblem(a, L, bc) > u = problem.solve() > # Plot solution and mesh > plot(u) > plot(mesh) > # Dump solution to file in VTK format > file = File("poisson.pvd") > file << u > # Hold plot > interactive() > > _______________________________________________ > Mailing list: https://launchpad.net/~fenics > Post to : [email protected] > Unsubscribe : https://launchpad.net/~fenics > More help : https://help.launchpad.net/ListHelp
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