[openib-general] RFC MPI and app. requirements of OpenIB

[Hal Rosenstock]

On Thu, 2005-12-22 at 16:54, Rimmer, Todd wrote:
> Since the SA views multicast operations at a node level, and applications 
> need to individually operate on multicast groups.  It is appropriate for 
> the core stack to provide some multicast management APIs.  These would 
> multiplex requests from all the applications on a node to make the 
> appropriate requests to the SA.  reference counts would need to be 
> maintained in the core stack for each MC group so that the node would 
> remove itself from the group only on last application exit/unregister.
> 
> This would also be a good place to handle the "MC group persistence issues".  
> Namely rejoining requested groups when ports go up/down, SMs change 
> (client reregister), etc.

Yes, this has been raised in a thread by Eitan started on 11/22 entitled
"First Multicast Leave disconnects all other clients"
(http://openib.org/pipermail/openib-general/2005-November/014023.html).

-- Hal

> Todd Rimmer
> Chief Systems Architect             SilverStorm Technologies
> Voice: 610-233-4852                   Fax: 610-233-4777
> TRimmer at SilverStorm.com         www.SilverStorm.com
> 
> 
> > -----Original Message-----
> > From: amith rajith mamidala [mailto:mamidala at cse.ohio-state.edu]
> > Sent: Thursday, December 22, 2005 4:39 PM
> > To: Sean Hefty
> > Cc: openib
> > Subject: RE: [openib-general] RFC MPI and app. requirements of OpenIB
> > 
> > 
> > 
> > > An alternative is to provide UD and multicast/broadcast 
> > support in the CMA.  I
> > > know that the Intel MPI runs over DAPL, which does not 
> > provide multicast
> > > support.  Can MPI operate with unreliable multicast 
> > support?  Does MPI plan on
> > > using IB multicast?
> > 
> > Yes, the MPI can operate with unreliable multicast support.
> > MVAPICH-0.9.6 has this broadcast support over IB multicast. As Hal
> > suggested earlier, application processes interact with SA to 
> > create/join
> > multicast groups.
> > 
> > Thanks,
> > Amith
> > >
> > >
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