[petsc-users] VecScatter betweeen Vectors with different parallel layouts

[Barletta, Ivano]

Hello PETSc users

I was wondering if you've got any suggestion for the issue
mentioned in the topic.

I'm solving a linear system on my unstructured grid that has its
own partitioning. When I set up the linear system in PETSc I
use the model partitioning whose grid points might not be
evenly balanced (generally is not) over the processors.

So far I use VecScatter and IS to re-order the solution vector
with the application numbering.

What I aim at, now, is to let PETSc to decide the linear system
partitioning with PETSC_DECIDE local dimension and
see if I get some gain in performances, but in
this case I have to scatter between vectors that, at any rate, have
different parallel layouts (one of the requirements of
VecScatter is to have 2 Vecs with same layouts)

Does anyone of you have ever faced a similar problem?
any suggestion about how to circumvent this?

Feel free to ask for further information if my explanation is
not clear enough

Thanks in advance
Ivano
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