[mpiwg-rma] making dynamic windows suck less

Jim Dinan james.dinan at gmail.com
Sun Dec 1 10:40:08 CST 2013

Can the MPI_Win_memobj be an MPI_Aint?

I don't share this pessimism with respect to dynamic windows; I think we
need to prove that these issues exist before we try to fix them.


On Wed, Nov 27, 2013 at 5:46 PM, Jeff Hammond <jeff.science at gmail.com>wrote:

> Lots of people think - I take position on their correctness - that
> dynamic windows are doomed to substandard performance.  I can
> certainly see some potential for this on networks that require memory
> registration.
> Can we try to add an opaque object that can encapsulate memory
> registration such that dynamic windows 2.0 would not have so many
> problems?  If one were to send-recv not just the virtual address but
> MPI_Win_memobj (to be named properly later), then maybe we could deal
> with the shortcomings of IB, etc. w.r.t. RDMA and memory registration.
> This is really just a thought.  I have no concrete proposal.  Maybe
> people will have ideas in December.
> Jeff
> --
> Jeff Hammond
> jeff.science at gmail.com
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