[petsc-users] Equivalent of VecScatter for index sets

[Jed Brown]

Rémi Lacroix <remi.lacroix at inria.fr> writes:
> So basically I need to have a look at the underlying mechanism of 
> VecScatter and implement something similar for IS. How complex would it 
> be in practice?

It is one operation with PetscSF.  You'll call ISGetIndices(), use
PetscSFSetGraph(), then PetscSFBcastBegin and End.
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