[Mpi3-rma] Conflicting PUT/GET accesses clarification

[Rajeev Thakur]

341:2  "The target_datatype may not specify overlapping entries in the target buffer." (for Put)

342:38 "The origin_datatype may not specify overlapping entries in the origin buffer." (for Get)

346:12 "target_datatype must not specify overlapping entries" (for Accumulate)


On Apr 27, 2011, at 3:51 PM, Pavan Balaji wrote:

> 
> Page 339 lines 21-24 of MPI-2.2 states the following:
> 
> "It is erroneous to have concurrent confl icting accesses to the same memory location in a window; if a location is updated by a put or accumulate operation, then this location cannot be accessed by a load or another RMA operation until the updating operation has completed at the target."
> 
> What does this mean when I do PUT with a datatype with overlapping buffers? Is that valid or erroneous?
> 
> -- Pavan
> 
> -- 
> Pavan Balaji
> http://www.mcs.anl.gov/~balaji
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