[petsc-users] Question on VecScatter options

[Randall Mackie]

The VecScatter man page says that the default vecscatter type uses PetscSF, and that one can use PetscSF options to control the communication.


PetscSFCreate lists 3 different types, including MPI-3 options.


So I’m wondering is it enough to just add, for example, -sf_type neighbor to the list of PETSc options to have all VecScatter calls use MPI 3, and are there advantages to using that over the default options?


Thanks,

Randy M.