[mpich-discuss] Running HPL on RPi cluster, seems like MPI is somehow not configured properly since it work with 1 node but not more

[Kenneth Raffenetti]

Please try a simple test to ensure your mpiexec is working correctly. 
Something like:

   mpiexec -machinefile ~/machinefile -n 4 hostname

That should output the hostnames of the machines you are attempting to 
run on.

Second, you should ensure that the mpiexec and MPI library your program 
is linked against come from the same distribution. A common error we see 
is mixing MPICH's mpiexec with Open MPI's library, or vice versa.

Ken

On 05/26/2015 03:32 PM, Heerdt, Lanze M. wrote:
> I realize this may be a bit off topic, but since what I am doing seems
> to be a pretty commonly done thing I am hoping to find someone who has
> done it before/can help since I’ve been at my wits end for so long they
> are calling me Mr. Whittaker.
>
> I am trying to run HPL on a Raspberry Pi cluster. I used the following
> guides to get to where I am now:
>
> http://www.tinkernut.com/2014/04/make-cluster-computer/
>
> http://www.tinkernut.com/2014/05/make-cluster-computer-part-2/
>
> https://www.howtoforge.com/tutorial/hpl-high-performance-linpack-benchmark-raspberry-pi/#comments
>
> and a bit of:
> https://www.raspberrypi.org/forums/viewtopic.php?p=301458#p301458 when
> the above guide wasn’t working
>
> basically when I run: “mpiexec -machinefile ~/machinefile -n 1 xhpl” it
> works just fine
>
> but when I run “mpiexec -machinefile ~/machinefile -n 4 xhpl” it errors
> with the attached image. (if I use “mpirun…” I get the exact same behavior)
>
> [Note: I HAVE changed the HPL.dat to have “2    Ps” and “2    Qs” from 1
> and 1 for when I try to run it with 4 processes]
>
> This is for a project of mine which I need done by the end of the week
> so if you see this after 5/29 thank you but don’t bother responding
>
> I have hpl-2.1, mpi4py-1.3.1, mpich-3.1, and openmpi-1.8.5 at my disposal
>
> In the machinefile are the 4 IP addresses of my 4 RPi nodes
>
> 10.15.106.107
>
> 10.15.101.29
>
> 10.15.106.108
>
> 10.15.101.30
>
> Any other information you need I can easily get to you so please do not
> hesitate to ask. I have nothing else to do but try and get this to work :P
>
>
>
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