fenics team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Mon, May 17, 2010 at 09:30:58AM +0200, Lorenzo Isella wrote:
> Anders Logg wrote:
> >This looks like a problem with your MPI/DOLFIN installation, not the
> >script itself.
> >
> >What happens when you write
> >
> >  python -c "import dolfin"
> >
> >?
> >
>
> Hi Anders,
> Thanks for helping. Here is the output you wanted
>
> $ python -c "import dolfin"
> Fatal error in MPI_Comm_size: Invalid communicator, error stack:
> MPI_Comm_size(111): MPI_Comm_size(comm=0xb5d0e1c0,
> size=0x7fff07719fbc) failed
> MPI_Comm_size(69).: Invalid communicator
>
> but unfortunately, it still sounds Greek to me.

To me too. Hopefully someone else has an idea what goes wrong.

--
Anders


> Any help is really appreciated.
> Cheers



> Lorenzo
>
>
> >
> >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()
> >>
> >>_______________________________________________
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