[petsc-dev] Ghost update in VecAssembly?

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:

> It was suggested to me that we add VecGhostUpdate() to VecAssembly(). This
> sounds
> reasonable to me. What do you think?

Uh, why?  What is the most common use of VecAssembly?  Seems like
building b or x_0 to solve A x = b, in which case you don't need updated
ghost values.  Also, who uses VecGhost _and_ VecAssembly for the same
Vec?  That's quite wasteful; if you have local indexing, why not just
use VecGhostUpdate(...,SCATTER_REVERSE)?
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