Hello, 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: mpiexec -f machinefile -n 4 hostname My machinefile contains the following: pi@Pi01 ~/mpi_test $ cat machinefile 192.168.2.121 192.168.2.122 192.168.2.123 192.168.2.124 But, when I run the mpiexec command, I get the following error: pi@Pi01 ~/mpi_test $ mpiexec -f machinefile -n 4 hostname Pi01 [mpiexec@Pi01] control_cb (/home/pi/mpich2/mpich-3.1/src/pm/hydra/pm/pmiserv/pmiserv_cb.c:200): assert (!closed) failed [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 [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 [mpiexec@Pi01] main (/home/pi/mpich2/mpich-3.1/src/pm/hydra/ui/mpich/mpiexec.c:336): process manager error waiting for completion pi@Pi01 ~/mpi_test $ Clearly, I am missing something. Would appreciate any help in advance. Thanks. Ken 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. ping 192.168.2.122 PING 192.168.2.122 (192.168.2.122) 56(84) bytes of data. 64 bytes from 192.168.2.122: icmp_req=1 ttl=64 time=0.807 ms 64 bytes from 192.168.2.122: icmp_req=2 ttl=64 time=0.626 ms 64 bytes from 192.168.2.122: icmp_req=3 ttl=64 time=0.614 ms 64 bytes from 192.168.2.122: icmp_req=4 ttl=64 time=0.605 ms 64 bytes from 192.168.2.122: icmp_req=5 ttl=64 time=0.603 ms ^C --- 192.168.2.122 ping statistics --- 5 packets transmitted, 5 received, 0% packet loss, time 4002ms rtt min/avg/max/mdev = 0.603/0.651/0.807/0.078 ms pi@Pi01 ~/mpi_test $ ping 192.168.2.123 PING 192.168.2.123 (192.168.2.123) 56(84) bytes of data. 64 bytes from 192.168.2.123: icmp_req=1 ttl=64 time=0.794 ms 64 bytes from 192.168.2.123: icmp_req=2 ttl=64 time=0.634 ms 64 bytes from 192.168.2.123: icmp_req=3 ttl=64 time=0.628 ms 64 bytes from 192.168.2.123: icmp_req=4 ttl=64 time=0.607 ms ^C --- 192.168.2.123 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 3003ms rtt min/avg/max/mdev = 0.607/0.665/0.794/0.081 ms pi@Pi01 ~/mpi_test $ ping 192.168.2.124 PING 192.168.2.124 (192.168.2.124) 56(84) bytes of data. 64 bytes from 192.168.2.124: icmp_req=1 ttl=64 time=0.787 ms 64 bytes from 192.168.2.124: icmp_req=2 ttl=64 time=0.632 ms 64 bytes from 192.168.2.124: icmp_req=3 ttl=64 time=0.612 ms ^C --- 192.168.2.124 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2002ms rtt min/avg/max/mdev = 0.612/0.677/0.787/0.078 ms pi@Pi01 ~/mpi_test $ _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss