[mpich-discuss] mpiexec.hydra does not work in ClearCase vobs

[Pavan Balaji]

I'm not sure I fully understand how this works, but can you try the
-wdir option to mpiexec?

% mpiexec.hydra -wdir $CLEARCASE_ROOT <remaining_options>

This forces Hydra to change the directory to that specified by "wdir"
before executing the command. You might want to play around with what
directory path to give to -wdir to figure out the right value.

You can do:

% mpiexec.hydra -wdir $CLEARCASE_ROOT pwd

... to figure out what directory Hydra is executing the executable
launch from.

 -- Pavan

On 01/15/2010 11:35 AM, chong tan wrote:
> the directory is inside ClearCase vobs, knowns as 'view' in ClearCase. 
> It is only visible after
> running the 'clearcase setview' command.
>  
> The way people got around probelm with Grid+Clearcase is to add a
> wrapper shell to check for the
> env var CLEARCASE_ROOT, and run the clearcase setview command, like :
>  
> #!/bin/sh
>    if [ X_$CLEARCASE_ROOT = X_ ] then
>         # NOT Clearcase
>    else
>       
>        cleartool setview -exec "whatever command commands " `basename
> $CLEARCASE_ROOT
>    fi
>  
>  
> ----
> make this the wrapper script to the grid.    (CLEARCASE_ROOT is of the
> form /view/<viewname>,
> we only need the <viewname> part to set the view)
>  
>  
> I think something like this will be need for mpiexec hydra.  Hopefully
> the info here is enough to get the
> support into hydra.
>  
> tan
> 
>  
> 
> ------------------------------------------------------------------------
> *From:* Pavan Balaji <balaji at mcs.anl.gov>
> *To:* mpich-discuss at mcs.anl.gov
> *Sent:* Thu, January 14, 2010 3:56:42 PM
> *Subject:* Re: [mpich-discuss] mpiexec.hydra does not work in ClearCase vobs
> 
> 
> Unfortunately, I don't know anything about ClearCase. Is the directory
> you are launching mpiexec from available on all machines (I'm assuming
> you are not explicitly setting -wdir in mpiexec)?
> 
> -- Pavan
> 
> On 01/14/2010 12:51 PM, Dave Goodell wrote:
>> On Jan 14, 2010, at 12:42 PM, chong tan wrote:
>>
>>> if the wdir is in ClearCaseVob.  Getting this error:
>>>
>>> [proxy at cappy] HYD_pmcd_pmi_proxy_launch_procs
>>> (./pm/pmiserv/pmi_proxy_utils.c:658): unable to change wdir (No such
>>> file or directory)
>>
>> Not sure about this here.  My limited understanding of ClearCase is that
>> it provides its VCS capabilities in large part through a custom
>> filesystem that is mounted on the machine.  So it's entirely possible
>> that hydra and that filesystem are not interacting correctly.
>>
>> Unfortunately I don't believe that we have access to ClearCase here at
>> ANL, so it will be very difficult for us to reproduce and debug the
>> problem.  Pavan may have an idea of what's going on here, but otherwise
>> we would welcome any patches or assistance that you can offer figuring
>> out what's going on.
>>
>>> Another issue: it ask for my passwd on 'localhost' when I run
>>> mpiexec.hydra locally.  This does not make much sense as I am already
>>> logged in.
>>
>> It makes sense for various implementation reasons when you are using the
>> default bootstrap server, "ssh".  If you only wish to run processes on
>> the current node, you can use the "fork" bootstrap server:
>>
>>
> http://wiki.mcs.anl.gov/mpich2/index.php/Using_the_Hydra_Process_Manager#Bootstrap_Servers
>>
>>
>> Basically pass "-bootstrap fork" to mpiexec or set the HYDRA_BOOTSTRAP
>> environment variable to fork.
>>
>> -Dave
>>
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> 
> -- 
> Pavan Balaji
> http://www.mcs.anl.gov/~balaji
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> 
> 
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-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji