[mpich-discuss] Strange MPICH2 behavior in Clearcase

[chong tan]

hydra is not a solution I can use.  The main issue is that login is not allow in most grid env.

running mpd outside of clearcase view does not work as the executables are inside views.  It looks like
the problem could be inside mpd or mpiexec.  The likely cause is that I am running from 2 different views.
It would be nice if I can run 2 mpd, one per view, on the same machine, to help isolate the problem.

tan





________________________________
From: Dave Goodell <goodell at mcs.anl.gov>
To: mpich-discuss at mcs.anl.gov
Sent: Thu, April 8, 2010 10:29:40 AM
Subject: Re: [mpich-discuss] Strange MPICH2 behavior in Clearcase

We (the MPICH2 developers) don't have any experience with clearcase.  Perhaps someone in the community does though.  Because of the way that clearcase works, strange filesystem behavior in MPD doesn't surprise me.

I would try two things:

1) Use hydra with the "-wdir" option instead of MPD, as we discussed in a previous thread: https://lists.mcs.anl.gov/mailman/htdig/mpich-discuss/2010-January/006356.html

2) Run your mpdboot from a directory outside of your clearcase mount.  This might avoid some of these problems.

-Dave

On Apr 8, 2010, at 11:59 AM, chong tan wrote:

> I am running MPICH2 1.2.1 in Clearcase and observed this crazy MPICH2 behavior.  basically,
> I have 2 code streams (or clearcase view), one is a stable one and is where I am writing new code.
> the 2 streams are not compatible to some extend.  Say my executable is called MY, so there are 2
> version of it.
> 
> I launch MY in a common script using :
> 
> mpiexec MY < options> : MY < options>  : ...
> 
> I run both, alternatedly on my test cases.  the run dir is cleaned to the bone between the runs.  From time
> to time, I run into situation where the wrong executable was picked up.  the problem goes away after
> I restart mpd.
> 
> Question:  is this a know issue of MPICH2 ? or this is a issue of MPICH2 + clearcase ?
> 
> thanks
> tan
> 
> 
> 
> 
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> mpich-discuss mailing list
> mpich-discuss at mcs.anl.gov
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