[petsc-dev] Reduction in KSPGetVecs via DMCreateGlobalVector

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:
> I think we also do this in some Vec output routines. We have to go through
> and find all the
> places that we can provide both sizes to Layout/IS/Vec.

We have to reference the existing PetscLayout.  With a million ranks and
64-bit ints, each PetscLayout is 8 MiB, which is unacceptable overhead
per Vec.
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