[mpiwg-rma] ordering text

Jeff Hammond jeff.science at gmail.com
Mon Aug 10 09:04:26 CDT 2015

"11.7.2 Ordering" says:

"MPI specifies ordering between accumulate operations from one process to
the same (or overlapping) memory locations at another process on a
per-datatype granularity."
This seems to say that ordering is required between overlapping windows,
which is a horrible semantic.  We need to add a "per-window" caveat here.

Later, we talk about overlapping memory regions, rather than locations,
which is confusing:

"MPI does not provide any guarantees for accesses or updates from different
origin processes to overlapping target memory regions."
What is a memory region anyways?  Is it a window?  Is it a set of memory

And to be clear, I think I know what we mean in the RMA chapter, but others
may not.


Jeff Hammond
jeff.science at gmail.com
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