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<p class="MsoNormal">Hi Wesley,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">As I mentioned in my email, MPI_disconnect hangs.<o:p></o:p></p>
<p class="MsoNormal">Here is a short program which you can run.<o:p></o:p></p>
<p class="MsoNormal">Please note that there is an “assert” in client.c<o:p></o:p></p>
<p class="MsoNormal">Compile : <o:p></o:p></p>
<p class="MsoNormal">>> mpicc server.c –o server<o:p></o:p></p>
<p class="MsoNormal">>> mpicc client.c –o client<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">To run use two shell/terminal :<o:p></o:p></p>
<p class="MsoNormal">Term1>> mpiexec –n 1 ./server<o:p></o:p></p>
<p class="MsoNormal">Term2>> mpiexec –n 1 ./client<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Please press any key on the server terminal.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I earlier filed a bug related to this : <a href="http://trac.mpich.org/projects/mpich/ticket/2205">
http://trac.mpich.org/projects/mpich/ticket/2205</a><o:p></o:p></p>
<p class="MsoNormal">My question :<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">1><span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>What happens if we don’t call MPI_Finalize and call exit(0)?<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l1 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">2><span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Is there anyway I can forcefully complete MPI_disconnect from server side ?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Hirak<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Ps : The reason of using sock is : bug in nemesis : <a href="http://trac.mpich.org/projects/mpich/ticket/1103">
http://trac.mpich.org/projects/mpich/ticket/1103</a> and <a href="http://trac.mpich.org/projects/mpich/ticket/79">
http://trac.mpich.org/projects/mpich/ticket/79</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:13.5pt;color:black">Wesley Bland</span></b><span class="apple-converted-space"><span style="font-size:13.5pt;color:black;background:white"> </span></span><a href="mailto:discuss%40mpich.org?Subject=Re%3A%20%5Bmpich-discuss%5D%20MPI_Finalize%20hangs%20in%20dynamic%20connection%20in%0A%09case%20of%20failed%20process&In-Reply-To=%3CF4B1C63E-062B-4036-9DE5-A4C93096F32C%40anl.gov%3E" title="[mpich-discuss] MPI_Finalize hangs in dynamic connection in case of failed process"><span style="font-size:13.5pt">wbland
at anl.gov</span><span class="apple-converted-space"><span style="font-size:13.5pt;color:blue;text-decoration:none"> </span></span></a><span style="font-size:13.5pt;color:black"><br>
<i>Thu Feb 26 10:13:42 CST 2015</i></span><o:p></o:p></p>
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<span style="font-size:13.5pt">Previous message:<span class="apple-converted-space"> </span><a href="http://lists.mpich.org/pipermail/discuss/2015-February/003725.html">[mpich-discuss] MPI_Finalize hangs in dynamic connection in case of failed process</a><o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
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<pre style="white-space:pre-wrap;orphans: auto;text-align:start;widows: auto;-webkit-text-stroke-width: 0px;word-spacing:0px"><span style="color:black">First, I believe the sock device is untested with most of the MPICH fault tolerance features, so YMMV here.<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">Is there a reason that you aren’t calling MPI_Disconnect for the failed process? Did you try it an something bad happened? That seems like the most straightforward way of doing things.<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">Otherwise, this sounds like a known issue that we’re seeing from time to time with MPI_Finalize and the FT work. It’s something I’m trying to figure out now. If you can reduce your code down to the minimum and send it to me, I can use it as a test case to try to fix the problem.<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">Thanks,<o:p></o:p></span></pre>
<pre><span style="color:black">Wesley<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">><i> On Feb 19, 2015, at 5:15 AM, Roy, Hirak <<a href="https://lists.mpich.org/mailman/listinfo/discuss">Hirak_Roy at mentor.com</a>> wrote:<o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> <o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> Hi All,<o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> <o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> I am using MPICH with sock connection.<o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> I also setup processes using dynamic connection method (MPI_Comm_connect/MPI_Comm_accept). It’s a master-slave architecture where master accepts the connections from slaves.<o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> <o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> Now if one of the process dies (or get killed), I can still recover from this (without using checkpoint/restore method).<o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> For the particular process in master, I do not call MPI_disconnect (it hangs and does not complete).<o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> As a result, my MPI_Finalize in master hangs and does not complete.<o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> Do you have a workaround to forcefully complete MPI_Finalize or MPI_disconnect?<o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> I tried MPI_Comm_free on the failed connection. However, it does not solve the hang in finalize.<o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> <o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> Thanks,<o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> Hirak<o:p></o:p></i></span></pre>
<pre><span style="color:black">><i> _______________________________________________</i><o:p></o:p></span></pre>
<p class="MsoNormal"><o:p> </o:p></p>
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