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

[chong tan]

the wdir issue is similr to the problem qsub and bsub have.  Some qsub and bsub has been patched to deal with this
by checking if the launching process is in ClearCase view.  then launch 'clearcase setview' in each of the
shell it starts.  <Disclaimer : I only saw a limited version of qsub that has this capability, I am not  sure if that
is generally true>  


As a second note: hydra is causing very strange situation with my simple minded test that only use single sided
MPI call.   THis code has no probelm with all version of mpiexec I have tested.

thanks
tan




________________________________
From: Dave Goodell <goodell at mcs.anl.gov>
To: mpich-discuss at mcs.anl.gov
Sent: Thu, January 14, 2010 10:51:23 AM
Subject: Re: [mpich-discuss] mpiexec.hydra does not work in ClearCase vobs

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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