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

[chong tan]

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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> mpich-discuss at mcs.anl.gov
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-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji
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