[petsc-dev] Comp-comm overlap with DMPlex

[Michael Lange]

Hi,

I am trying to implement a computation-communication overlap with 
DMPlex, where local values that do not need to be sent are updated while 
the DM/SF is broadcasting the ghost values (DMGlobalToLocal() or 
PetscSFBcast(), I've tried both). The problem is that this only works if 
I force the broadcast to end before the computation is performed, but it 
fails if they actually overlap. In that case it seems that the updates 
to the global Vec are ignored completely. Am I missing something here or 
can somebody point me to a working example that does comp-comm overlap 
with DMPlex?

Kind regards
Michael Lange