I just saw your older email. Why are you using smpd instead of the default process manager (hydra)? -- Pavan On 06/13/2013 08:05 AM, Pavan Balaji wrote:

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