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FEniCS / dolfinx

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Revise necessity of ghostUpdate() in demos/tests

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michalhabera
michalhabera commented Nov 19, 2020

The actual ghostUpdate is truly needed only in very few places, for most local operations one knows the value for ghosts without communication.

This

u.vector.copy(result=u0.vector)
u0.vector.ghostUpdate(addv=PETSc.InsertMode.INSERT, mode=PETSc.ScatterMode.FORWARD)

could become

with u0.vector.localForm() as loc0, u.vector.localForm() as loc:
    loc.copy(loc0)
``
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