Hello all. <div>I want to learn MPI and I&#39;ve trying to setting up OMPI for first time on three nodes. My config above:</div><div>Ubuntu server - master node: pruebaborja </div><div>2x Ubuntu Desktop - slaves node:  </div>
<div>clienteprueba</div><div>clientepruebados 4 slots</div><div><br></div><div>Im running NFSv4 for sharing /home/mpiuser.</div><div>I want to test a plain &quot;Hello world&quot;but I can&#39;t make it working successfully on node clienteprueba. This is the problem:</div>
<div><br></div><div>mpiuser@pruebaborja:~$ mpirun -np 6 --hostfile .mpi_hostfile ./holamundo</div><div>[clienteprueba:01993] [[64434,0], 2] -&gt; [[64434,0],0] mca_oob_tcp_msg_send_handler: writev:failed: Bad file descriptor (9) [sd = 9]</div>
<div>[clienteprueba:01993] [[64434,0], 2] routed:binomial: Connection to lifeline [[64434,0],0] lost</div><div><br></div><div>However, with clientepruebados and pruebaborja only on my hostfile, it works:</div><div><br></div>
<div>pruebaborja slots=1</div><div>clientepruebados slots=4</div><div>#clienteprueba slots=1</div><div><br></div><div>mpiuser@pruebaborja:~$ mpirun -np 6 --hostfile .mpi_hostfile ./holamundo</div><div>Hola, mundo, soy pruebaborja: 0 de 6</div>
<div>Hola, mundo, soy pruebaborja: 5 de 6</div><div>Hola, mundo, soy clientepruebados: 1 de 6</div><div>Hola, mundo, soy clientepruebados: 2 de 6</div><div>Hola, mundo, soy clientepruebados: 3 de 6</div><div>Hola, mundo, soy clientepruebados: 4 de 6</div>
<div><br></div><div>I&#39;ve checked the OMPI versions on the machines and it&#39;s the same. I can&#39;t understand why Im getting this error on clienteprueba; i&#39;ve done the same config on  clientepruebados and clienteprueba. Anyone could help me to solve this?</div>
<div><br></div><div>Sorry for my english. </div><div>Thanks in advance</div><div><br></div><div><br></div>