Thanks to all of you, I can write a small test that seems to be doing what I
want following Marc's suggestion. But I have a few questions (the test code is
attached)
* cell->set_dof_values(local_data, m_completely_distributed_solution);
Does set_dof_values set entries in m_completely_distributed_solution that are
not owned by the current rank?
No. You determine up front upon construction of the vector elements are
locally owned, which are ghosted, and which are stored elsewhere. Writing into
entries does not change this decision.
* m_completely_distributed_solution.compress(VectorOperation::insert);
After set_dof_values, if I call compress(VectorOperation::insert) on that
PETSc vector, now, does that mean that I now have entries in that distributed
vector that are not owned by the current rank?
Same here.
* m_locally_relevant_solution = m_completely_distributed_solution;
Will this assignment of a distributed vector to a locally relevant vector
correctly set the ghost values?
Yes. That's the point :-)
If this test code is correct, it will be great to add this as a test to
deal.ii. My current work will be dependent on this part working correctly, and
it will be nice to have a test that can alert us if something changes in the
future.
We're always happy to add more tests to the test suite!
Best
W.
--
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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