[Beowulf] choosing a high-speed interconnect

joachim at ccrl-nece.de joachim at ccrl-nece.de
Wed Oct 13 07:37:18 PDT 2004

>    QP scaling isn't as critical an issue if the MPI implementation sets
> up the connections as needed (kinda of a lazy connection setup).  Why
> set up an all-to-all QP connectivity if the MPI implements an all-to-all
> or collectives as tree based pt2pt algorithms.  Network congestion on

Good MPI collectives often are not tree based, but need more connectivity.
Of course, the best collectives are optimized for a certain interconnect.


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