That is accurate. We expect to support OPA with the btl/ofi component. It
should give much better performance than osc/pt2pt + mtl/ofi. What would be
good for you to do on your end is verify everything works as expected and that
the performance is on par for what you expect.
-Nathan
> On Apr 12, 2019, at 9:11 AM, Heinz, Michael William
> wrote:
>
> Hey guys,
>
> So, I’ve watched the videos, dug through the release notes, and participated
> in a few of the weekly meetings and I’m feeling a little more comfortable
> about being a part of Open MPI - and I’m looking forward to it.
>
> But I find myself needing to look for some direction for my participation
> over the next few months.
>
> First - a little background. Historically, I’ve been involved with IB/OPA
> development for 17+ years now, but for the past decade or so I’ve been
> entirely focused on fabric management rather than application-level stuff.
> (Heck, if you ever wanted to complain about why OPA management datagrams are
> different from IB MADs, feel free to point the finger at me, I’m happy to
> explain why the new ones are better… ;-) ) However, it was only recently that
> the FM team were given the additional responsibility for maintaining /
> participating in our MPI efforts with very little opportunity for a transfer
> of information with the prior team.
>
> So, while I’m looking forward to this new role I’m feeling a bit overwhelmed
> - not least of which because I will be unavailable for about 8 weeks this
> summer…
>
> In particular, I found an issue in our internal tracking systems that says
> (and I may have mentioned this before…)
>
> OMPI v5.0.0 will remove osc/pt2pt component that is the only component that
> MTLs use (PSM2 and OFI). OMPI v5.0.0 is planned to be released during summer
> 2019 (no concrete dates).
> https://github.com/open-mpi/ompi/wiki/5.0.x-FeatureList. The implications is
> that none of the MTLs used for Omni-Path will support running one sided MPI
> APIs (RMA).
>
> Is this still accurate? The current feature list says:
>
> If osc/rdma supports all possible scenarios (e.g., all BTLs support the RDMA
> methods osc/rdma needs), this should allow us to remove osc/pt2pt (i.e., 100%
> migrated to osc/rdma).
>
> If this is accurate, I’m going to need help from the other maintainers to
> understand the reason this is being done, the scope of this effort and where
> we need to focus our attention. To deal with the lack of coverage over the
> summer, I’ve asked a co-worker, Brandon Yates to start sitting in on the
> weekly meetings with me.
>
> Again, I’m looking forward to both the opportunity of working with an open
> source team, and the chance to focus on the users of our software instead of
> just the management of the fabric - I’m just struggling at the moment to get
> a handle on this potential deadline.
>
> ---
> Mike Heinz
> Networking Fabric Software Engineer
> Intel Corporation
>
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