[mpich-discuss] Unexpected results

Thu Apr 2 20:20:10 CDT 2015

Antonio,

Thanks for the quick response.

I did do the following on each of the other three Pis:

On Pi02:
ssh-keygen
cd .ssh
cd id_rsa.pub pi02
scp 192.168.2.121:/home/pi/.ssh/p01 .
cat pi01>>authorized_keys

and then I copied each from the other three Pis to Pi01 and cat those to the authorized_keys on Pi01

Is that what you are referring to?

If not, do you mind pointing me in the right direction?

Thanks in advance.

Ken

On Apr 2, 2015, at 9:09 PM, Antonio J. Peña <apenya at mcs.anl.gov> wrote:

> 
> Hi Ken,
> 
> Please check that you have password-less ssh connectivity between the nodes.
> 
> Best,
>   Antonio
> 
> 
> On 04/02/2015 07:33 PM, Ken Miller wrote:
>> 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 at 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 at Pi01 ~/mpi_test $ mpiexec -f machinefile -n 4 hostname
>> Pi01
>> [mpiexec at Pi01] control_cb (/home/pi/mpich2/mpich-3.1/src/pm/hydra/pm/pmiserv/pmiserv_cb.c:200): assert (!closed) failed
>> [mpiexec at 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 at 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 at Pi01] main (/home/pi/mpich2/mpich-3.1/src/pm/hydra/ui/mpich/mpiexec.c:336): process manager error waiting for completion
>> pi at 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 at 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 at 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 at Pi01 ~/mpi_test $ 
>> 
>> 
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> 
> 
> -- 
> 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
> apenya at mcs.anl.gov
> www.mcs.anl.gov/~apenya
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