[Beowulf] Infiniband modular switches

[Greg Lindahl]

On Mon, Jul 14, 2008 at 01:42:07PM -0400, Patrick Geoffray wrote:

> AlltoAll of large messages is not a useless synthetic benchmark IMHO.

AlltoAll is a real thing used by real codes, but do keep in mind that
there are many algorithms for AlltoAll with various message sizes and
network topologies, so it's testing both the raw interconnect and the
AlltoAll implementation. I don't know of the results you mention were
run with an optimal AlltoAll... do you?

-- greg