Pavan, I had a lot of trouble getting hydra to work without having to enter a password/passphrase. I saw the option to pass a phrase in the mpich installers guide. I eventually found that for that command you needed to use the smpd process manager. That's the only reason I chose smpd over hydra. As to your other suggestion. I ran ./main and the same error (Can't open /dev/mem...) appeared. sudo ./main works but of course without multiple processes. Eibhlin ________________________________________ From: [email protected] [[email protected]] on behalf of Pavan Balaji [[email protected]] Sent: 13 June 2013 14:34 To: [email protected] Subject: Re: [mpich-discuss] Running an mpi program that needs to access /dev/mem 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 _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss