[mpiwg-rma] making dynamic windows suck less

[Jeff Hammond]

How do you do pure (i.e. active-message and rendezvous-free) RDMA with just a virtual address (MPI_Aint) in (1) PAMI, (2) OFED, (3) DMAPP, (4) Portals4?

Jeff

Sent from my iPhone

> On Dec 1, 2013, at 10:40 AM, Jim Dinan <james.dinan at gmail.com> wrote:
> 
> 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.
> 
>  ~Jim.
> 
> 
>> 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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