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<pre><span style="color:black"><o:p> </o:p></span></pre>
<p class="MsoNormal">Hi Sangmin,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The readme of mpich says the following :<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">FAILURE NOTIFICATION: THIS IS AN UNSUPPORTED FEATURE AND WILL<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black">ALMOST CERTAINLY CHANGE IN THE FUTURE!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> In the current release, hydra notifies the MPICH library of failed<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> processes by sending a SIGUSR1 signal. The application can catch<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> this signal to be notified of failed processes. If the application<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> replaces the library's signal handler with its own, the application<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> must be sure to call the library's handler from it's own<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> handler. Note that you cannot call any MPI function from inside a<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New";color:black"> signal handler.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If this is true, should not I expect SIGUSR1?<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>
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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 of all, MPI functions are not signal safe. So, if you try to use signals within your MPI program, things might break.<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">— Sangmin<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">On Oct 9, 2014, at 7:37 AM, Roy, Hirak <<a href="https://lists.mpich.org/mailman/listinfo/discuss">Hirak_Roy at mentor.com</a><mailto:<a href="https://lists.mpich.org/mailman/listinfo/discuss">Hirak_Roy at mentor.com</a>>> wrote:<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">Hi ,<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">I have two MPI processes (server and client) launched independently by two different mpiexec command. (mpich-3.0.4, sock-device)<o:p></o:p></span></pre>
<pre><span style="color:black">1> mpiexec –disable-auto-cleanup –n 1 ./server<o:p></o:p></span></pre>
<pre><span style="color:black">2> mpiexec –disable-auto-cleanup –n 1 ./client<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">The server opens a port and does MPI_Comm_accept.<o:p></o:p></span></pre>
<pre><span style="color:black">The client gets the port information and does MPI_Comm_connect and hence we get a new intercommunicator.<o:p></o:p></span></pre>
<pre><span style="color:black">I don’t do MPI_Comm_merge.<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">I have installed my own signal handler for SIGUSR1 before even I call MPI_Init ( I guess, this will automatically chain the signal handler).<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">>><i> signal (SIGUSR1, mysignalhandler);<o:p></o:p></i></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">Now suppose, the ‘client’ process gets killed ( I forcefully kill the process by signal 9), I thought I would get SIGUSR1 in the process ‘server’.<o:p></o:p></span></pre>
<pre><span style="color:black">However, I don’t get any signal in ‘server’ process.<o:p></o:p></span></pre>
<pre><span style="color:black">Am I doing something wrong?<o:p></o:p></span></pre>
<pre><span style="color:black">I have noticed that if I start 4 client processes with single mpiexec command, and one client gets killed, rest of the 3 clients receive SIGUSR1.<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">Does this mean, SIGUSR1 is not forwarded across processes connected using inter-communicator?<o:p></o:p></span></pre>
<pre><span style="color:black"><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">Hirak<o:p></o:p></span></pre>
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