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[Kent-Andre Mardal <kent-and@xxxxxxxxx>]

Should it be 
xx = PETScVector(20) ?

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Importing PyTrilinos can cause MPI crash
https://bugs.launchpad.net/bugs/661342
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Status in DOLFIN: New

Bug description:
The import order appears to be very important with PyTrlinos, and can cause some MPI problems. 
In the below code, order doesn't help. The program just crashes.

from PyTrilinos import Epetra
from dolfin import *
parameters["linear_algebra_backend"] = "Epetra"
xx = PETScVector(20)