Fande Kong <[email protected]> writes: > 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.
The SF graph is asymmetric so that it can have cleaner semantics. Read my note and reply here if something is still unclear. http://59a2.org/files/StarForest.pdf
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