On Apr 15, 2016, at 9:18 AM, Dorier, Matthieu <mdor...@anl.gov> wrote:
> 
> I'd like to know how OpenMPI implements MPI_Bcast. And if different 
> implementations are provided, how one is selected.

This is a fairly complicated topic.  This old paper is the foundation for how 
Open MPI works (it's a bit different these days, but the basic concepts 
described in this paper are still mostly relevant):

    https://www.open-mpi.org/papers/ics-2004/

-- 
Jeff Squyres
jsquy...@cisco.com
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