<div dir="ltr"><a href="https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/483">https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/483</a><br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Aug 24, 2015 at 8:03 AM, Jim Dinan <span dir="ltr"><<a href="mailto:james.dinan@gmail.com" target="_blank">james.dinan@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">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.</div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Mon, Aug 10, 2015 at 10:04 AM, Jeff Hammond <span dir="ltr"><<a href="mailto:jeff.science@gmail.com" target="_blank">jeff.science@gmail.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">
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<p><span style="font-size:12pt;font-family:CMSS12">"11.7.2 Ordering" says: </span></p>
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</div><p><span style="font-size:11pt;font-family:CMSS10">"MPI </span><span style="font-size:11pt;font-family:CMR10">specifies ordering between accumulate operations from one process to the same (or
overlapping) memory locations at another process on a per-datatype granularity."</span></p>
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</div><div>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.</div><div><br></div><div>Later, we talk about overlapping memory regions, rather than locations, which is confusing:</div><div>
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<p><span style="font-size:11pt;font-family:CMSS10">"MPI </span><span style="font-size:11pt;font-family:CMR10">does not provide any guarantees
for accesses or updates from different origin processes to overlapping target memory regions."</span></p>
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</div></div><div>What is a memory region anyways? Is it a window? Is it a set of memory locations?</div><div><br></div><div>And to be clear, I think I know what we mean in the RMA chapter, but others may not.</div><span><font color="#888888"><div><br></div><div>Jeff</div><div><br></div>-- <br><div>Jeff Hammond<br><a href="mailto:jeff.science@gmail.com" target="_blank">jeff.science@gmail.com</a><br><a href="http://jeffhammond.github.io/" target="_blank">http://jeffhammond.github.io/</a></div>
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