[mpich-discuss] Running an mpi program that needs to access /dev/mem

[Pavan Balaji]

What's "-phrase"?  That's not a recognized option.  I'm not sure where 
the /dev/mem check is coming from.  Try running ~/main without mpiexec 
first.

  -- Pavan

On 06/13/2013 06:56 AM, Lee, Eibhlin wrote:
> Hello all,
>
> I am trying to use two raspberry-pi to sample and then process some
> data. The first process samples while the second processes and vice
> versa. To do this I use gpio and also mpich-3.0.4 with the process
> manager smpd. I have successfully run cpi on both machines (from the
> master machine). I have also managed to run a similar program but
> without the MPI, this involved compiling with gcc and when running
> putting sudo in front of the binary file.
>
> When I combine these two processes I get various error messages.
> For input:
> mpiexec -phrase cat -machinefile machinefile -n 2 ~/main
> the error is:
> Can't open /dev/mem
> Did you forget to use 'sudo .. ?'
>
> For input:
> sudo mpiexec -phrase cat -machinefile machinefile -n 2 ~/main
> the error is:
> sudo: mpiexec: Command not found
>
> I therefore put mpiexec into /usr/bin
>
> now for input:
> sudo mpiexec -phrase cat -machinefile machinefile -n 2 ~/main
> the error is:
> Can't open /dev/mem
> Did you forget to use 'sudo .. ?'
>
> Does anyone know how I can work around this?
> Thanks,
> Eibhlin
>
>
>
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-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji