https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/483 On Mon, Aug 24, 2015 at 8:03 AM, Jim Dinan <[email protected]> wrote:

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 <[email protected]> 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

-- Jeff Hammond [email protected] http://jeffhammond.github.io/

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-- Jeff Hammond [email protected] http://jeffhammond.github.io/