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    <div class="moz-cite-prefix"><br>
      Well, I meant to suggest to actually check if that had the
      expected effects, so rephrasing what I said: can you check if you
      can ssh without being asked for a password to all nodes from all
      nodes, using exactly what you have in the host file (i.e.: ip
      addresses)?<br>
      <br>
      <br>
      On 04/02/2015 08:20 PM, Ken Miller wrote:<br>
    </div>
    <blockquote cite="mid:2B903112-AC13-4D6D-82E2-9872F5AE5225@gmail.com" type="cite">
      
      Antonio,
      <div><br>
      </div>
      <div>Thanks for the quick response.</div>
      <div><br>
      </div>
      <div>I did do the following on each of the other three Pis:</div>
      <div><br>
      </div>
      <div>On Pi02:</div>
      <div>ssh-keygen</div>
      <div>cd .ssh</div>
      <div>cd id_rsa.pub pi02</div>
      <div>scp 192.168.2.121:/home/pi/.ssh/p01 .</div>
      <div>cat pi01>>authorized_keys</div>
      <div><br>
      </div>
      <div>and then I copied each from the other three Pis to Pi01 and
        cat those to the authorized_keys on Pi01</div>
      <div><br>
      </div>
      <div>Is that what you are referring to?</div>
      <div><br>
      </div>
      <div>If not, do you mind pointing me in the right direction?</div>
      <div><br>
      </div>
      <div>Thanks in advance.</div>
      <div><br>
      </div>
      <div>Ken</div>
      <div><br>
      </div>
      <div>
        <div>
          <div>On Apr 2, 2015, at 9:09 PM, Antonio J. Peña <<a moz-do-not-send="true" href="mailto:apenya@mcs.anl.gov">apenya@mcs.anl.gov</a>>
            wrote:</div>
          <br class="Apple-interchange-newline">
          <blockquote type="cite">
            <div text="#000000" bgcolor="#FFFFFF">
              <div class="moz-cite-prefix"><br>
                Hi Ken,<br>
                <br>
                Please check that you have password-less ssh
                connectivity between the nodes.<br>
                <br>
                Best,<br>
                  Antonio<br>
                <br>
                <br>
                On 04/02/2015 07:33 PM, Ken Miller wrote:<br>
              </div>
              <blockquote cite="mid:B9583627-EF54-49E4-AEA4-FD4F3FC874E5@gmail.com" type="cite"> Hello,
                <div><br>
                </div>
                <div>I am hoping someone might be able to point out what
                  I am doing wrong. I have setup a Raspberry Pi cluster
                  by going through a couple tutorials. The last step is
                  to use MPI to test the cluster. Everything was going
                  great until I ran the following command:</div>
                <div><br>
                </div>
                <div>
                  <div style="margin: 0px; font-size: 11px; font-family:
                    Menlo;">mpiexec -f machinefile -n 4 hostname</div>
                </div>
                <div style="margin: 0px; font-size: 11px; font-family:
                  Menlo;"><br>
                </div>
                <div style="margin: 0px; font-size: 11px; font-family:
                  Menlo;">My machinefile contains the following:</div>
                <div style="margin: 0px; font-size: 11px; font-family:
                  Menlo;"><br>
                </div>
                <div style="margin: 0px;">
                  <div style="font-family: Menlo; font-size: 11px;
                    margin: 0px;"><span style="color: #34bd26"><b>pi@Pi01</b></span>
                    <span style="color: #5330e1"><b>~/mpi_test $</b></span>
                    cat machinefile</div>
                  <div style="font-family: Menlo; font-size: 11px;
                    margin: 0px;">192.168.2.121</div>
                  <div style="font-family: Menlo; font-size: 11px;
                    margin: 0px;">192.168.2.122</div>
                  <div style="font-family: Menlo; font-size: 11px;
                    margin: 0px;">192.168.2.123</div>
                  <div style="font-family: Menlo; font-size: 11px;
                    margin: 0px;">192.168.2.124</div>
                  <div style="font-family: Menlo; font-size: 11px;
                    margin: 0px;"><br>
                  </div>
                  <div style="font-family: Menlo; font-size: 11px;
                    margin: 0px;">But, when I run the mpiexec command, I
                    get the following error:</div>
                  <div style="font-family: Menlo; font-size: 11px;
                    margin: 0px;"><br>
                  </div>
                  <div style="margin: 0px;">
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px;"><span style="color: #34bd26"><b>pi@Pi01</b></span>
                      <span style="color: #5330e1"><b>~/mpi_test $</b></span>
                      mpiexec -f machinefile -n 4 hostname</div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px;">Pi01</div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px;">[mpiexec@Pi01] control_cb
                      (/home/pi/mpich2/mpich-3.1/src/pm/hydra/pm/pmiserv/pmiserv_cb.c:200):
                      assert (!closed) failed</div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px;">[mpiexec@Pi01]
                      HYDT_dmxu_poll_wait_for_event
                      (/home/pi/mpich2/mpich-3.1/src/pm/hydra/tools/demux/demux_poll.c:76):
                      callback returned error status</div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px;">[mpiexec@Pi01]
                      HYD_pmci_wait_for_completion
                      (/home/pi/mpich2/mpich-3.1/src/pm/hydra/pm/pmiserv/pmiserv_pmci.c:198):
                      error waiting for event</div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px;">[mpiexec@Pi01] main
                      (/home/pi/mpich2/mpich-3.1/src/pm/hydra/ui/mpich/mpiexec.c:336):
                      process manager error waiting for completion</div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px; color: rgb(83, 48, 225);"><span style="color: #34bd26"><b>pi@Pi01</b></span><span style=""> </span><b>~/mpi_test $</b><span style=""> </span></div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px; color: rgb(83, 48, 225);"><span style=""><br>
                      </span></div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px; color: rgb(83, 48, 225);"><span style="">Clearly, I am missing something. Would
                        appreciate any help in advance.</span></div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px; color: rgb(83, 48, 225);"><span style=""><br>
                      </span></div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px; color: rgb(83, 48, 225);"><span style="">Thanks.</span></div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px; color: rgb(83, 48, 225);"><span style=""><br>
                      </span></div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px; color: rgb(83, 48, 225);"><span style="">Ken</span></div>
                    <div style="font-family: Menlo; font-size: 11px;
                      margin: 0px; color: rgb(83, 48, 225);"><span style=""><br>
                      </span></div>
                    <div style="margin: 0px;"><font face="Menlo"><span style="font-size: 11px;">ps. I am connected to
                          the other Pis evident by the following ping
                          results. I can also log into each of the other
                          3 Pis.</span></font></div>
                    <div style="margin: 0px;"><font face="Menlo"><span style="font-size: 11px;"><br>
                        </span></font></div>
                    <div style="margin: 0px;">
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">ping 192.168.2.122</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">PING 192.168.2.122
                        (192.168.2.122) 56(84) bytes of data.</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">64 bytes from
                        192.168.2.122: icmp_req=1 ttl=64 time=0.807 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">64 bytes from
                        192.168.2.122: icmp_req=2 ttl=64 time=0.626 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">64 bytes from
                        192.168.2.122: icmp_req=3 ttl=64 time=0.614 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">64 bytes from
                        192.168.2.122: icmp_req=4 ttl=64 time=0.605 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">64 bytes from
                        192.168.2.122: icmp_req=5 ttl=64 time=0.603 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">^C</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">--- 192.168.2.122 ping
                        statistics ---</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">5 packets transmitted, 5
                        received, 0% packet loss, time 4002ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">rtt min/avg/max/mdev =
                        0.603/0.651/0.807/0.078 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;"><span style="color:
                          #34bd26"><b>pi@Pi01</b></span> <span style="color: #5330e1"><b>~/mpi_test $</b></span>
                        ping 192.168.2.123</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">PING 192.168.2.123
                        (192.168.2.123) 56(84) bytes of data.</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">64 bytes from
                        192.168.2.123: icmp_req=1 ttl=64 time=0.794 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">64 bytes from
                        192.168.2.123: icmp_req=2 ttl=64 time=0.634 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">64 bytes from
                        192.168.2.123: icmp_req=3 ttl=64 time=0.628 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">64 bytes from
                        192.168.2.123: icmp_req=4 ttl=64 time=0.607 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">^C</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">--- 192.168.2.123 ping
                        statistics ---</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">4 packets transmitted, 4
                        received, 0% packet loss, time 3003ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">rtt min/avg/max/mdev =
                        0.607/0.665/0.794/0.081 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;"><span style="color:
                          #34bd26"><b>pi@Pi01</b></span> <span style="color: #5330e1"><b>~/mpi_test $</b></span>
                        ping 192.168.2.124</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">PING 192.168.2.124
                        (192.168.2.124) 56(84) bytes of data.</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">64 bytes from
                        192.168.2.124: icmp_req=1 ttl=64 time=0.787 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">64 bytes from
                        192.168.2.124: icmp_req=2 ttl=64 time=0.632 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">64 bytes from
                        192.168.2.124: icmp_req=3 ttl=64 time=0.612 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">^C</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">--- 192.168.2.124 ping
                        statistics ---</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">3 packets transmitted, 3
                        received, 0% packet loss, time 2002ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo;">rtt min/avg/max/mdev =
                        0.612/0.677/0.787/0.078 ms</div>
                      <div style="margin: 0px; font-size: 11px;
                        font-family: Menlo; color: rgb(83, 48, 225);"><span style="color: #34bd26"><b>pi@Pi01</b></span><span style=""> </span><b>~/mpi_test $</b><span style=""> </span></div>
                    </div>
                  </div>
                </div>
                <br>
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                <br>
                <pre wrap="">_______________________________________________
discuss mailing list     <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:discuss@mpich.org">discuss@mpich.org</a>
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              </blockquote>
              <br>
              <br>
              <pre class="moz-signature" cols="72">-- 
Antonio J. Peña
Postdoctoral Appointee
Mathematics and Computer Science Division
Argonne National Laboratory
9700 South Cass Avenue, Bldg. 240, Of. 3148
Argonne, IL 60439-4847
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:apenya@mcs.anl.gov">apenya@mcs.anl.gov</a>
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="http://www.mcs.anl.gov/%7Eapenya">www.mcs.anl.gov/~apenya</a></pre>
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        <br>
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      <br>
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      <br>
      <pre wrap="">_______________________________________________
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To manage subscription options or unsubscribe:
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    </blockquote>
    <br>
    <br>
    <pre class="moz-signature" cols="72">-- 
Antonio J. Peña
Postdoctoral Appointee
Mathematics and Computer Science Division
Argonne National Laboratory
9700 South Cass Avenue, Bldg. 240, Of. 3148
Argonne, IL 60439-4847
<a class="moz-txt-link-abbreviated" href="mailto:apenya@mcs.anl.gov">apenya@mcs.anl.gov</a>
<a class="moz-txt-link-abbreviated" href="http://www.mcs.anl.gov/~apenya">www.mcs.anl.gov/~apenya</a></pre>
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