<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
</head>
<body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">
<div>Hirak,</div>
<div><br>
</div>
<div>I would correct my previous response. We discussed this issue inside the MPICH team, and we concluded this is a gray area of the standard (it’s not clear when the functions are used with threads). Thus, we are not sure if your use case is right or wrong
because you were using different communicators. BTW, you may solve this issue by spawning a new process that connects back.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Sangmin</div>
<div><br>
</div>
<br>
<div>
<div>On Oct 9, 2014, at 7:27 AM, Roy, Hirak <<a href="mailto:Hirak_Roy@mentor.com">Hirak_Roy@mentor.com</a>> wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div lang="EN-US" link="blue" vlink="purple" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;">
<div class="WordSection1" style="page: WordSection1;">
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt;">Thanks Sangmin.<o:p></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt;">I would change the strategy to terminate the accept.<o:p></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt;"> </span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt;">Regards,<o:p></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt;">Hirak<o:p></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt; font-family: 'Courier New';"> </span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt; font-family: 'Courier New';"> </span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt; font-family: 'Courier New';">Hi Hirak,<o:p></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt; font-family: 'Courier New';"> </span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt; font-family: 'Courier New';">I checked your code. I think your code is incorrect because you are trying to establish communication within a single process. You are using two threads and two duplicated communicators, but they are
associated with a single process. MPI_Comm_accept() and MPI_Comm_connect() are used to establish communication between “two sets of MPI processes” (i.e., at least two different processes are needed). Please refer to 10.4 Establishing Communication (p. 387)
in MPI Standard 3.0.<o:p></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt; font-family: 'Courier New';"> </span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt; font-family: 'Courier New';">— Sangmin<o:p></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="font-size: 10pt; font-family: 'Courier New';"> </span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="color: rgb(31, 73, 125);"> </span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<span style="color: rgb(31, 73, 125);"> </span></div>
<div>
<div style="border-style: solid none none; border-top-color: rgb(181, 196, 223); border-top-width: 1pt; padding: 3pt 0in 0in;">
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<b><span style="font-size: 10pt; font-family: Tahoma, sans-serif;">From:</span></b><span style="font-size: 10pt; font-family: Tahoma, sans-serif;"><span class="Apple-converted-space"> </span>Roy, Hirak<span class="Apple-converted-space"> </span><br>
<b>Sent:</b><span class="Apple-converted-space"> </span>Thursday, October 09, 2014 2:17 AM<br>
<b>To:</b><span class="Apple-converted-space"> </span><a href="mailto:discuss@mpich.org">discuss@mpich.org</a><br>
<b>Subject:</b><span class="Apple-converted-space"> </span>Re: How to terminate MPI_Comm_accept<o:p></o:p></span></div>
</div>
</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<o:p> </o:p></div>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="font-family: Calibri, sans-serif;">Hi Pavan,<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="font-family: Calibri, sans-serif;"> </span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="font-family: Calibri, sans-serif;">Here is the code attached. Let me know if you think the code is incorrect.<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="font-family: Calibri, sans-serif;"> </span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="font-family: Calibri, sans-serif;">I used MPI-3.0.4 with sock device.<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="font-family: Calibri, sans-serif;"> </span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="font-family: Calibri, sans-serif;">Compile command : <o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="font-family: Calibri, sans-serif;"> </span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">export MPI_ROOT = /home/hroy/local/mpich-3.0.4/linux_x86_64<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">#export MPI_ROOT = /home/hroy/local/mpich-3.0.4.nemesis/linux_x86_64<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">export MPI_BIN = ${MPI_ROOT}/bin<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">export MPI_LIB = ${MPI_ROOT}/lib<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">export INCLUDE_DIR = ${MPI_ROOT}/include<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">compile: <o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style=""> g++ -g main.cpp -I ${INCLUDE_DIR} ${MPI_LIB}/libmpich.a ${MPI_LIB}/libmpl.a -lpthread <o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="font-family: Calibri, sans-serif;"> </span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style=""> </span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="font-family: Calibri, sans-serif;"> </span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="font-family: Calibri, sans-serif;">Thanks,<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="font-family: Calibri, sans-serif;">Hirak<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style=""> </span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">Can you send us a simple program that reproduces the issue?<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style=""> </span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style=""> — Pavan<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style=""> </span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">On Oct 8, 2014, at 2:54 PM, Roy, Hirak <<a href="https://lists.mpich.org/mailman/listinfo/discuss" style="color: purple; text-decoration: underline;">Hirak_Roy at mentor.com</a>> wrote:<o:p></o:p></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style=""> </span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">><i> Hi Pavan,<o:p></o:p></i></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">><i> <o:p></o:p></i></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">><i> I even tried duping the communicator (MPI_COMM_SELF à DUP1, DUP2) before I do any kind of MPI calls. <o:p></o:p></i></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">><i> Still it does not work.<o:p></o:p></i></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">><i> <o:p></o:p></i></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">><i> Thanks,<o:p></o:p></i></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">><i> Hirak<o:p></o:p></i></span></pre>
<pre style="margin: 0in 0in 0.0001pt; font-size: 10pt; font-family: 'Courier New';"><span style="">><i> </i><o:p></o:p></span></pre>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;">
<o:p> </o:p></div>
</div>
_______________________________________________<br>
discuss mailing list <a href="mailto:discuss@mpich.org">discuss@mpich.org</a><br>
To manage subscription options or unsubscribe:<br>
<a href="https://lists.mpich.org/mailman/listinfo/discuss">https://lists.mpich.org/mailman/listinfo/discuss</a></div>
</blockquote>
</div>
<br>
</body>
</html>