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

[Pavan Balaji]

I thought you moved to Hydra when we mentioned that smpd was not 
supported.  With smpd, you are on your own.  Sorry.

  -- Pavan

On 06/15/2013 12:18 PM, Lee, Eibhlin wrote:
> Pavan,
>
> Normally I start smpd when I'm the normal user. This time I did it in root. It then prompted me for a smpd phrase (This happened the first time I ever started it in normal user but the first time it had appeared in root.) The uid=0 now.
>
> However, when I try to execute the program now, in root, it just hangs. With no messages at all! I checked and the cpi example does work when in root.
>
> Eibhlin
> ________________________________________
> From: Pavan Balaji [balaji at mcs.anl.gov]
> Sent: 15 June 2013 17:02
> To: discuss at mpich.org
> Cc: Lee, Eibhlin
> Subject: Re: [mpich-discuss] Running an mpi program that needs to access        /dev/mem
>
> On 06/14/2013 04:43 PM, Lee, Eibhlin wrote:
>> sorry when I do run mpiexec id the output is
>> uid=1000(pi) gid=1000(pi)
>> groups=1000(pi),4(adm),20(dialout),24(cdrom),27(sudo),29(audio),44(video),46(plugdev),60(games),100(users),105(netdev),999(input)
>
> This is the crux of the problem.  Your application processes are being
> launched as the regular user (uid=1000) instead of as root (uid=0).  I
> assume this is how you ran the program; can you confirm?
>
> /* Login as root */
> % su
>
> % mpiexec [whatever_options] id
>
>    -- Pavan
>
> --
> Pavan Balaji
> http://www.mcs.anl.gov/~balaji
>

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji