IIRC, per-window ordering was the intent of the working group and it also seems like the only sensible reading of the chapter, given that we allow each window to provide a different value for the ordering info key. This might just be an erratum, but it would be helpful to create a ticket for it.On Mon, Aug 10, 2015 at 10:04 AM, Jeff Hammond <jeff.science@gmail.com> wrote:_______________________________________________
"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 locations?And to be clear, I think I know what we mean in the RMA chapter, but others may not.Jeff--
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