On Apr 29, 2009, at 6:52 PM, Woodruff, Robert J wrote:
I think if we did such a thing, we could implement a set of tag-
matching
primitives (similar to MX or PSM) that are kind of a separate library
from the OFA RDMA verbs, just like PSM for Qlogic is a separate
library and
not part of the OFA verbs. Just like with MX and PSM, I think the
registration
can be done my the tag-matching driver (like PSM or MX do) and
not require MPI to do it. Think of this as "the MPI tag-matching
interface" library
for OFA.
I would be extremely hesitant to have an OpenFabrics-provided library
do this. MPI implementations spend a *lot* of time an effort on this
section of code because it is *the* heart of the MPI message passing
engine. To be blunt: here is not enough MPI expertise in the current
set of OpenFabrics developers to build such a library. I doubt that
the academic and proprietary MPI implementations would want to
contribute resources to make one, either (it's their secret sauce!).
Indeed, to make such a proposal work, there would, by definition, have
to be new hardware capabilities, and therefore new verbs to support
those hardware capabilities. So this might just end up as new verbs
anyway -- not a new middleware library.
--
Jeff Squyres
Cisco Systems
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