[mpich-discuss] Unexpected results

Fri Apr 3 05:25:36 CDT 2015

I tried disabling the firewall real quick and still got the same results.

However, at one point I got the following error:
[proxy:0:1 at Pi02] launch_procs (/home/pi/mpich2/mpich-3.1/src/pm/hydra/pm/pmiserv/pmip_cb.c:641): unable to change wdir to /home/pi/mpi_test (No such file or directory)

So I scratched my head and wondered if it was something as silly as the fact that I was calling mpiexec from a directory that existed on Pi01 and not on the other three. I quickly created the same directory on the other three Pis and bam:

pi at Pi01 ~/mpi_test $ mpiexec -f machinefile -n 4 hostname
Pi01
Pi04
Pi03
Pi02

Was it really that simple?

Thanks.

Ken

On Apr 3, 2015, at 3:05 AM, Winkler, Ursula (ursula.winkler at uni-graz.at) <ursula.winkler at uni-graz.at> wrote:

> Hi,
>  
> did you check the firewall?
>  
> Ursula
>  
> Von: Ken Miller [mailto:swonomo at gmail.com] 
> Gesendet: Freitag, 03. April 2015 02:34
> An: discuss at mpich.org
> Betreff: [mpich-discuss] Unexpected results
>  
> 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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