[petsc-users] questions about PetscSF

[Fande Kong]

Hi all,

I was wondering mechanisms of the object PetscSF. What are definitions of
roots and leaves? Do roots/leaves associate with the data we want to
receive/send?  For the function Bcast, it seems that we transfer data from
roots to leaves. But in another function Reduce, it seems that we move data
in the opposite direction (from leaves to roots). These kind of mechanisms
possibly make users confused.


Fande,
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