[Mpi3-rma] [EXTERNAL] Re: MPI-3 UNIFIED model clarification

Jed Brown jedbrown at mcs.anl.gov
Sun Aug 4 18:31:30 CDT 2013

Pavan Balaji <balaji at mcs.anl.gov> writes:
> This is not an ordering issue if I'm talking about nonoverlapping 
> memory.  If P0 is doing PUTs to P1s memory, and P1 is reading some other 
> nonoverlapping region of it's own memory, P0 and P1 need to synchronize 
> in some way if they use the SEPARATE model (e.g., by using EXCLUSIVE 
> locks).  If they used the UNIFIED model, they can do these accesses 
> concurrently without any synchronization.

At some point, P1 (or other ranks) must learn that it can now access the
memory that P0 was PUTing into.  How would you do that?
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