Thanks for trying.
Do you feel that this is an impossible request without the assistance of some process running as root, for example, as Reuti mentioned, the daemons of a job scheduler? Or are you saying it will just not be as straightforward as calling setgid as you had hoped?
Also, do you think there is a way I could make use of the sg command below? Perhaps there is a way to have the rsh/ssh launcher start the application processes with a command like 'sg <group> <executable name>'?
Ed
NAME
sg - execute command as different group ID
SYNOPSIS
sg [-] [group [-c ] command]
DESCRIPTION
The sg command works similar to newgrp but accepts a command. The
command will be executed with the /bin/sh shell. With most shells you
may run sg from, you need to enclose multi-word commands in quotes.
Another difference between newgrp and sg is that some shells treat
newgrp specially, replacing themselves with a new instance of a shell
that newgrp creates. This doesn't happen with sg, so upon exit from a
sg command you are returned to your previous group ID.
-----Original Message-----
From: users-bounces_at_[hidden] [mailto:users-bounces_at_[hidden]] On Behalf Of Ralph Castain
Sent: Wednesday, September 14, 2011 11:33 AM
To: Open MPI Users
Subject: Re: [OMPI users] EXTERNAL: Re: Can you set the gid of the processes created by mpirun?
On Sep 14, 2011, at 9:39 AM, Blosch, Edwin L wrote:
> Thanks, Ralph,
>
> I get the failure messages, unfortunately:
>
> setgid FAILED
> setgid FAILED
> setgid FAILED
>
> I actually had attempted to call setgid from within the application previously, which looks similar to what you've done, but it failed. That was when I initiated the post to the mailing list. My conclusion, a guess really, was that Linux would not let me setgid from within my program because I was not root.
I was afraid of that - the documentation seemed to indicate that would be the case, but I figured it was worth a quick try. Sorry I can't be of help.
>
>
> -----Original Message-----
> From: users-bounces_at_[hidden] [mailto:users-bounces_at_[hidden]] On Behalf Of Ralph Castain
> Sent: Wednesday, September 14, 2011 8:15 AM
> To: Open MPI Users
> Subject: Re: [OMPI users] EXTERNAL: Re: Can you set the gid of the processes created by mpirun?
>
> The attached should set the gid of the remote daemons (and their children) to the gid of mpirun. No cmd line option or anything is required - it will just always do it.
>
> Would you mind giving it a try?
>
> Please let me know if/how it works.
>
> _______________________________________________
> users mailing list
> users_at_[hidden]
> http://www.open-mpi.org/mailman/listinfo.cgi/users
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