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Re: [ptp-user] Launcher Needs Place to Specify Arguments to Mpiexec
Ken,

We're working on adding extra functionality to the launch configuration that should solve most of these issues. The launch configuration will allow you to specify either the number of processes, a list of hosts, or a file containing a list of hosts, as well as arbitrary arguments to the mpiexec (mpirun) command. This should be in the next point release, but probably won't fix the prefix problem. For that, you'll need the new resource manager that we're also working, but which probably won't be available until the 2.1 release. This will also add the ability to modify any of the OpenMPI MCA parameters in the UI as well.

Regards,

Greg

On Apr 11, 2008, at 2:45 PM, Kenneth Evans wrote:

Hi,

 

I have installed the 2.0 release and it fixes many of the problems I was having.  In addition, it appears to work with MPICH2, which is what we use here, so that is all good.  PTP is coming along.

 

However using MPICH2 brings me back to the problem I had with OpenMPI, how to specify which hosts to use (and to specify other arguments to mpiexec in general).  I got around this with OpenMPI by settings the hosts in MPI_HOME/etc/openmpi-default-hostfile rather than using mpiexec –machinefile.  However, I still didn’t have the finer control that arguments to mpiexec would give.

 

Unfortunately, this workaround doesn’t work with MPICH2.  MPICH2 starts daemons on the head node and on other nodes in the file specified by mpdboot –f <file>.  It will then use the _head node_ for running programs as well as the ones in <file>, which we don’t want to happen.  It can’t be fixed as with OpenMPI.  I could fix it if I could use mpiexec –machinefile.

 

A second point is that now that I am running both OpenMPI and MPICH2, it would be nice to be able to use mpiexec –prefix so the nodes can find the OpenMPI files rather than the MPICH2 ones, which are the default from .cshrc.  (I can start Eclipse with the  PATH set to OpenMPI so ORTE works, but I haven’t found a way to pass this on to the nodes.  Consequently, I have to change my .cshrc and log in again to use OpenMPI.)

 

In general, there are many other arguments to mpiexec that should be available.  There should be a box in the launcher Arguments tab for arguments to the program (as is there now) _and_ also to mpiexec (which is not there).

 

The situation is the same as for launching Java programs, where you specify arguments to the program _and_ to the VM.  It doesn’t seem like this would be hard to implement.

 

Thanks,

 

        -Ken

 

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