This scenario was not mentioned, but I'll bet it falls into the same
general category. If an HCA has different run-time characteristics,
regardless of whether they are caused by the OEM or the reseller,
that's probably "heterogeneous enough" for this discussion.
On Jan 26, 2009, at 2:41 PM, Don Kerr wrote:
Jeff,
Did IWG say anything about there being a chip set issue? Example
what if a vender, say Sun, wraps Mellanox chips and on its own
HCAs, would Mellanox HCA and Sun HCA work together?
-DON
On 01/26/09 14:19, Jeff Squyres wrote:
The Interop Working Group (IWG) of the OpenFabrics Alliance asked
me to bring a question to the Open MPI user and developer
communities: is anyone interested in having a single MPI job span
HCAs or RNICs from multiple vendors? (pardon the cross-posting,
but I did want to ask each group separately -- because the answers
may be different)
The interop testing lab at the University of New Hampshire (http://www.iol.unh.edu/services/testing/ofa/
) discovered that most (all?) MPI implementations fail when having
a single MPI job span HCAs from multiple vendors and/or span RNICs
from multiple vendors. I don't remember the exact details (and
they may not be public, anyway), but I'm pretty sure that OMPI
failed when used with QLogic and Mellanox HCAs in a single MPI
job. This is fairly unsurprising, given how we tune Open MPI's use
of OpenFabrics-capable hardware based on our .ini file.
So my question is: does anyone want/need to support jobs that span
HCAs from multiple vendors and/or RNICs from multiple vendors?
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Jeff Squyres
Cisco Systems
