[Openframeworkwg] Details on Mellanox on-demand paging

[Jason Gunthorpe]

On Thu, Jan 16, 2014 at 12:03:43AM +0000, Hefty, Sean wrote:
> > I've talked to a few people and looked at the old mailing list archives; I
> > have a few more details on what the MPI community didn't like.  But all of
> > these conversations were back in May and June 2013 -- and may well be based
> > on stale information.
> 
> Based on what I remember of ODP, I think it has the potential to simplify things for MPI and help, but may result in back pressure into the fabric or dropped packets.  Maybe those were the issues?  It's not entirely clear how it will perform in practice, which may vary based on the app.

I though the main issue with ODP as it was available then was it needed
a mode to register all process address space. Otherwise MPI still
needs to track what address space is/isn't registered and make
registration calls.

registering all address space and removing the coherence issue seems
like exactly what the MPI people have been asking for..

-- 
Jason Gunthorpe <jgunthorpe at obsidianresearch.com>        (780)4406067x832
Chief Technology Officer, Obsidian Research Corp         Edmonton, Canada