<!-- BaNnErBlUrFlE-BoDy-start -->
<!-- Preheader Text : BEGIN -->
<div style="display:none !important;display:none;visibility:hidden;mso-hide:all;font-size:1px;color:#ffffff;line-height:1px;height:0px;max-height:0px;opacity:0;overflow:hidden;">
Hi Howard, The MPI_SESSION_INIT procedure is listed as “l” for local and (2) meaning not related to an MPI operation in the huge semantics table in Appendix A (MPI-4. 1, p 881, line 29). This is correct but quite well hidden. Perhaps we could
</div>
<!-- Preheader Text : END -->
<!-- Email Banner : BEGIN -->
<div style="display:none !important;display:none;visibility:hidden;mso-hide:all;font-size:1px;color:#ffffff;line-height:1px;height:0px;max-height:0px;opacity:0;overflow:hidden;">ZjQcmQRYFpfptBannerStart</div>
<!--[if ((ie)|(mso))]>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="padding: 16px 0px 16px 0px; direction: ltr" ><tr><td>
<table border="0" cellspacing="0" cellpadding="0" style="padding: 0px 10px 5px 6px; width: 100%; border-radius:4px; border-top:4px solid #90a4ae;background-color:#D0D8DC;"><tr><td valign="top">
<table align="left" border="0" cellspacing="0" cellpadding="0" style="padding: 4px 8px 4px 8px">
<tr><td style="color:#000000; font-family: 'Arial', sans-serif; font-weight:bold; font-size:14px; direction: ltr">
This Message Is From an External Sender
</td></tr>
<tr><td style="color:#000000; font-weight:normal; font-family: 'Arial', sans-serif; font-size:12px; direction: ltr">
This message came from outside your organization.
</td></tr>
</table>
</td></tr></table>
</td></tr></table>
<![endif]-->
<![if !((ie)|(mso))]>
<div dir="ltr" id="pfptBannerui9to4o" style="all: revert !important; display:block !important; text-align: left !important; margin:16px 0px 16px 0px !important; padding:8px 16px 8px 16px !important; border-radius: 4px !important; min-width: 200px !important; background-color: #D0D8DC !important; background-color: #D0D8DC; border-top: 4px solid #90a4ae !important; border-top: 4px solid #90a4ae;">
<div id="pfptBannerui9to4o" style="all: unset !important; float:left !important; display:block !important; margin: 0px 0px 1px 0px !important; max-width: 600px !important;">
<div id="pfptBannerui9to4o" style="all: unset !important; display:block !important; visibility: visible !important; background-color: #D0D8DC !important; color:#000000 !important; color:#000000; font-family: 'Arial', sans-serif !important; font-family: 'Arial', sans-serif; font-weight:bold !important; font-weight:bold; font-size:14px !important; line-height:18px !important; line-height:18px">
This Message Is From an External Sender
</div>
<div id="pfptBannerui9to4o" style="all: unset !important; display:block !important; visibility: visible !important; background-color: #D0D8DC !important; color:#000000 !important; color:#000000; font-weight:normal; font-family: 'Arial', sans-serif !important; font-family: 'Arial', sans-serif; font-size:12px !important; line-height:18px !important; line-height:18px; margin-top:2px !important;">
This message came from outside your organization.
</div>
</div>
<div style="clear: both !important; display: block !important; visibility: hidden !important; line-height: 0 !important; font-size: 0.01px !important; height: 0px"> </div>
</div>
<![endif]>
<div style="display:none !important;display:none;visibility:hidden;mso-hide:all;font-size:1px;color:#ffffff;line-height:1px;height:0px;max-height:0px;opacity:0;overflow:hidden;">ZjQcmQRYFpfptBannerEnd</div>
<!-- Email Banner : END -->
<!-- BaNnErBlUrFlE-BoDy-end -->
<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head><!-- BaNnErBlUrFlE-HeAdEr-start -->
<style>
#pfptBannerui9to4o { all: revert !important; display: block !important;
visibility: visible !important; opacity: 1 !important;
background-color: #D0D8DC !important;
max-width: none !important; max-height: none !important }
.pfptPrimaryButtonui9to4o:hover, .pfptPrimaryButtonui9to4o:focus {
background-color: #b4c1c7 !important; }
.pfptPrimaryButtonui9to4o:active {
background-color: #90a4ae !important; }
</style>
<!-- BaNnErBlUrFlE-HeAdEr-end -->
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Aptos;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:10.0pt;
font-family:"Aptos",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#467886;
text-decoration:underline;}
span.EmailStyle19
{mso-style-type:personal-reply;
font-family:"Aptos",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;
mso-ligatures:none;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-GB" link="#467886" vlink="#96607D" style="word-wrap:break-word">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Hi Howard,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">The MPI_SESSION_INIT procedure is listed as “l” for local and (2) meaning not related to an MPI operation in the huge semantics table in Appendix A (MPI-4.1, p 881, line 29).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">This is correct but quite well hidden. Perhaps we could add “This procedure is local.” in normative text just after the binding?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">We do elucidate the point, using an example (Example 11.9) where two MPI objects (communicators) are created using the same session in one MPI process but in different sessions in
another MPI process. This example cannot be correct unless the creation/instantiation of a session is NOT collective and does NOT synchronise.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">We could also include one or more pictures, like the ones we’ve used in the WG when talking about bubbles. The text art in Example 11.9 is not the most pleasing visual expression
of the concept.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Best wishes,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Dan.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> mpiwg-sessions <mpiwg-sessions-bounces@lists.mpi-forum.org>
<b>On Behalf Of </b>Pritchard Jr., Howard via mpiwg-sessions<br>
<b>Sent:</b> Friday, July 12, 2024 4:32 PM<br>
<b>To:</b> MPI Sessions working group <mpiwg-sessions@lists.mpi-forum.org><br>
<b>Cc:</b> Pritchard Jr., Howard <howardp@lanl.gov><br>
<b>Subject:</b> [mpiwg-sessions] Looks like we do have a topic to discuss soon<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">HI Everyone, Well it looks like we have a topic we do need to discuss soon, possibly for an errata item for 4.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">2.
There seems to be more ambiguity about what is implied by the wording in section 11.</span><span style="font-size:1.0pt;font-family:"Arial",sans-serif;color:white"> </span><span style="font-size:1.0pt;color:white">3 concerning MPI_SESSION_INIT – Session instantiation
<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">ZjQcmQRYFpfptBannerStart<o:p></o:p></span></p>
</div>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="100%" style="width:100.0%;border-radius:4px">
<tbody>
<tr>
<td style="padding:12.0pt 0cm 12.0pt 0cm">
<table class="MsoNormalTable" border="1" cellspacing="0" cellpadding="0" width="100%" style="width:100.0%;background:#D0D8DC;border:none;border-top:solid #90A4AE 3.0pt">
<tbody>
<tr>
<td valign="top" style="border:none;padding:0cm 7.5pt 3.75pt 4.5pt">
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" align="left">
<tbody>
<tr>
<td style="padding:3.0pt 6.0pt 3.0pt 6.0pt">
<p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:black">This Message Is From an External Sender
<o:p></o:p></span></b></p>
</td>
</tr>
<tr>
<td style="padding:3.0pt 6.0pt 3.0pt 6.0pt">
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">This message came from outside your organization.
<o:p></o:p></span></p>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
<div>
<p class="MsoNormal" style="mso-line-height-alt:.75pt"><span style="font-size:1.0pt;color:white">ZjQcmQRYFpfptBannerEnd<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual">HI Everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual">Well it looks like we have a topic we do need to discuss soon, possibly for an errata item for 4.2.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual">There seems to be more ambiguity about what is implied by the wording in section 11.3 concerning<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual">MPI_SESSION_INIT –
<i>Session</i> <i>instantiation is intended to be a lightweight operation </i>than many of us may have realized.<o:p></o:p></span></p>
<p class="MsoNormal"><i><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual">We don’t explicitly state whether this call is in any sense synchronizing with other processes.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual">We’ve talked about this so long, for instance in terms of asymmetry with MPI_SESSION_FINALIZE, that we didn’t consider<br>
that an implementor may construe that MPI_SESSION_INIT has the same implicit synchronization behavior as MPI_INIT.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual">We may want to add something in an errata to clarify what lightweight means.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual">Again I will not be able to call in on Monday but perhaps if others want to discuss?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual">The meeting will be automatically recorded BTW.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual">Howar<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">-------<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="366" style="width:274.5pt;border-collapse:collapse">
<tbody>
<tr style="height:129.6pt">
<td width="76" valign="top" style="width:56.95pt;padding:0cm 5.4pt 0cm 5.4pt;height:129.6pt">
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif"><img width="55" height="55" style="width:.5729in;height:.5729in" id="Picture_x0020_5" src="cid:image001.png@01DAD47A.912A5460" alt="signature_61897647"></span><span style="font-size:9.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
</td>
<td width="290" valign="top" style="width:217.55pt;padding:0cm 5.4pt 0cm 5.4pt;height:129.6pt">
<p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#0B1A8C">Howard Pritchard<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#545961">Research Scientist<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#545961">HPC-ENV<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C">Los Alamos National Laboratory<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C"><a href="mailto:howardp@lanl.gov"><span style="color:#0563C1">howardp@lanl.gov</span></a><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><a href="https://urldefense.us/v3/__https:/www.instagram.com/losalamosnatlab/__;!!G_uCfscf7eWS!dbZccRYCcJZ8TbF_EhT6HopcdaJyb4u97DQfUDmGDEhNCAAU2hpfMv6bIBhU3PWR2PzW6MZVJ2di947WgOPbI6wjOnz_WCc$"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;text-decoration:none"><img border="0" width="27" height="27" style="width:.2812in;height:.2812in" id="Picture_x0020_4" src="cid:image002.png@01DAD47A.912A5460" alt="signature_4180174387"></span></b></a><a href="https://urldefense.us/v3/__https:/twitter.com/LosAlamosNatLab__;!!G_uCfscf7eWS!dbZccRYCcJZ8TbF_EhT6HopcdaJyb4u97DQfUDmGDEhNCAAU2hpfMv6bIBhU3PWR2PzW6MZVJ2di947WgOPbI6wjXwr6J60$"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;text-decoration:none"><img border="0" width="27" height="27" style="width:.2812in;height:.2812in" id="Picture_x0020_3" src="cid:image003.png@01DAD47A.912A5460" alt="signature_937381201"></span></b></a><a href="https://urldefense.us/v3/__https:/www.linkedin.com/company/los-alamos-national-laboratory/__;!!G_uCfscf7eWS!dbZccRYCcJZ8TbF_EhT6HopcdaJyb4u97DQfUDmGDEhNCAAU2hpfMv6bIBhU3PWR2PzW6MZVJ2di947WgOPbI6wjRk6GtnI$"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;text-decoration:none"><img border="0" width="27" height="27" style="width:.2812in;height:.2812in" id="Picture_x0020_2" src="cid:image004.png@01DAD47A.912A5460" alt="signature_35314574"></span></b></a><a href="https://urldefense.us/v3/__https:/www.facebook.com/LosAlamosNationalLab/__;!!G_uCfscf7eWS!dbZccRYCcJZ8TbF_EhT6HopcdaJyb4u97DQfUDmGDEhNCAAU2hpfMv6bIBhU3PWR2PzW6MZVJ2di947WgOPbI6wjG2gdL6U$"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C;text-decoration:none"><img border="0" width="27" height="27" style="width:.2812in;height:.2812in" id="Picture_x0020_1" src="cid:image005.png@01DAD47A.912A5460" alt="signature_2948438747"></span></b></a><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0B1A8C"><o:p></o:p></span></b></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;mso-ligatures:standardcontextual"><o:p> </o:p></span></p>
</div>
</body>
</html>