Running

  $ mpirun -n 2 python demo_mixed-poisson.py

on PETSc produces obviously wrong results. Adding line

  print norm(w)

results in 1.3060017846e+11 instead of correct 0.611356580181. Strange
is that with 

  parameters['linear_algebra_backend'] = 'Epetra'

it gives me correct results. So is it my installation or are DOLFIN
PETSc wrappers broken?

Jan
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