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Hi Sayan, On Fri, Apr 25, 2025 at 2: 03 PM Ghosh, Sayan <sayan. ghosh@ pnnl. gov> wrote: Consider finalize-delete-callback (this is what Alfredo is alluding to perhaps w. r. t datatype-attached-to-environment) – that seems to rely on MPI_COMM_SELF</div>
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<div dir="ltr"><div dir="ltr"><div class="gmail_default" style="color:rgb(0,0,0)">Hi Sayan,</div><div class="gmail_default" style="color:rgb(0,0,0)"><br></div></div><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Fri, Apr 25, 2025 at 2:03 PM Ghosh, Sayan <<a href="mailto:sayan.ghosh@pnnl.gov">sayan.ghosh@pnnl.gov</a>> wrote:<span class="gmail_default" style="color:rgb(0,0,0)"></span><span style="font-size:11pt"></span></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-7426761734476150922"><div lang="EN-US" style="overflow-wrap: break-word;"><div class="m_-7426761734476150922WordSection1"><ul style="margin-top:0in" type="disc"><li class="m_-7426761734476150922MsoListParagraph" style="margin-left:0in"><span style="font-size:11pt">Consider finalize-delete-callback (this is what Alfredo is alluding to perhaps w.r.t datatype-attached-to-environment) – that seems to rely on MPI_COMM_SELF
callback (freeing comm-self triggers callback)<u></u><u></u></span></li></ul>
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<p class="MsoNormal"><span style="font-size:11pt"></span><br></p></div></div></div></div></div></blockquote><div><br><div dir="ltr"><div class="gmail_default" style="color:rgb(0,0,0)">That
is a good point. At first glance, attaching things to MPI_COMM_WORLD or
MPI_COMM_SELF would have a similar effect to attaching stuff to the environment.</div><div class="gmail_default" style="color:rgb(0,0,0)">I
didn't think about this because I was reluctant to modify (in any way)
either of these special communicators, in particular MPI_COMM_WORLD.</div><div class="gmail_default" style="color:rgb(0,0,0)">But MPI_COMM_SELF might still be a good candidate; others can point out if there is a catch.</div><div class="gmail_default" style="color:rgb(0,0,0)"><br></div><div class="gmail_default" style="color:rgb(0,0,0)">Thanks,</div><div class="gmail_default" style="color:rgb(0,0,0)">Alfredo</div></div></div><div><span style="font-size:12pt"><u><br></u></span></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-7426761734476150922"><div lang="EN-US" style="overflow-wrap: break-word;"><div class="m_-7426761734476150922WordSection1"><div id="m_-7426761734476150922mail-editor-reference-message-container"><div><div><div><div>
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