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Subject: Re: [OMPI devel] RFC: Remove heterogeneous support
From: Joshua Ladd (jladd.mlnx_at_[hidden])
Date: 2014-04-30 12:44:54

Hi, OMPI Community

On the call yesterday, Ralph and Jeff posed the question to the Community
at large and to NVIDIA in particular if they/we/us have a vested interest
in heterogeneous support. Mellanox and NVIDIA are partnering on systems
that, on today's roadmap, could require heterogeneous support from the
underlying MPI. At the moment, it's not known if this will remain an issue.
Today it appears it is, but tomorrow it may not be. So, anyhow, to answer
the question: Yes, there are core OMPI developers and industrial partners
for whom this support appears to be important given the current state of
the art.

Best regards,


Joshua S. Ladd, PhD
Staff Engineer, HPC Software
Mellanox Technologies

Email: joshual_at_[hidden]

On Mon, Apr 28, 2014 at 2:00 PM, Nathan Hjelm <hjelmn_at_[hidden]> wrote:

> On Mon, Apr 28, 2014 at 01:58:13PM -0400, George Bosilca wrote:
> > My concern was more about the “what" factor: what do you write on remote
> memory in a heterogeneous case. I imagine you can either write the
> converted data or you can convert remotely after writing. Anyway, on both
> cases you need intermediary buffers to do the conversion (especially if we
> are looking a size mismatch), so the interest of RMA is quickly vanishing.
> >
> > For now, I would just not support heterogeneous environments for RMA. We
> might want to add a check at windows creation time, so at least the users
> are warned.
> Good point. I will look at adding a warning now.
> -Nathan
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