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Subject: Re: [OMPI users] EXTERNAL: Re: Can you set the gid of the processes created by mpirun?
From: Ralph Castain (rhc_at_[hidden])
Date: 2011-09-14 13:48:47


On Sep 14, 2011, at 11:02 AM, Blosch, Edwin L wrote:

> 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?

The latter - if you are using rsh, then we might be able to use the command line when we launch the orted to set the group id.

>
> 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>'?

Try -mca orte_launch_agent "sg N orted", where N is the desired group ID.

>
> 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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