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

[Lee, Eibhlin]

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: discuss-bounces at mpich.org [discuss-bounces at mpich.org] on behalf of Pavan Balaji [balaji at mcs.anl.gov]
Sent: 13 June 2013 14:34
To: discuss at mpich.org
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
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