[mpiwg-rma] making dynamic windows suck less

Jeff Hammond jeff.science at gmail.com
Wed Nov 27 16:46:31 CST 2013

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

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 Hammond
jeff.science at gmail.com

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