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<p class="MsoNormal">I am using MPICH2 1.3.2p1 with hydra launcher and sock device.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’ve noticed that when I start a job via mpirun, the follow processes<o:p></o:p></p>
<p class="MsoNormal">are started on my behalf.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">1) mpirun<o:p></o:p></p>
<p class="MsoNormal">2) ssh to all the machines<o:p></o:p></p>
<p class="MsoNormal">3) hydra_pmi_proxy on all the machine<o:p></o:p></p>
<p class="MsoNormal">4) my exe on all the machines<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I kill the mpirun process, 1,2 and 3 are all terminated, but my exe (4)<o:p></o:p></p>
<p class="MsoNormal">continues to function normally.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">My questions:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">1) Is this expected behavior?<o:p></o:p></p>
<p class="MsoNormal">2) Should killing the mpirun process kill all the ranks?<o:p></o:p></p>
<p class="MsoNormal">3) Is there any operation that the ranks could do that require the proxy process?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m asking, as I’ve noticed strange hangs in my exe potentially related to creating new<o:p></o:p></p>
<p class="MsoNormal">MPI_Comm’s, but only after I kill the mpirun process.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">sk<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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