[petsc-dev] Reduction in KSPGetVecs via DMCreateGlobalVector

[Jed Brown]

Barry Smith <bsmith at mcs.anl.gov> writes:

>   At one point DMCreateGlobalVector_DA() did a duplicate of a “base” global vector, then in theory it could share the layout but that is all different now.
>
>    Note that the basic VecDuplicate_MPI() does share the previous layout but then there is a VecDuplicate_MPI_DA() which does not share the layout.

Should DM just reference the PetscLayout the first time it creates a
Vec, then use it for all subsequent Vecs (VecSetLayout instead of
VecSetSizes)?
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