It's not two concurrent accesses -- it's a single (overlapping) access. -- Pavan On 04/27/2011 04:58 PM, James Dinan wrote:

On 04/27/2011 03:51 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?

My interpretation is that this is also erroneous.

~Jim. _______________________________________________ mpi3-rma mailing list [email protected] http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi3-rma

-- Pavan Balaji http://www.mcs.anl.gov/~balaji