Re: [myrinet] Multiple programs in one application

You can run multiple jobs with mpich-gm.  That is if you are
going to put a little effor into it.  The functionality has
been removed from mpirun.ch_gm, but the underlying libraries
can do it.  At FSL we have a modified version of mpirun, but
I was able to easily modify that to support multiple executables.

If you want the original mpich syntax back, it may be pretty easy.
One question that I have is that if you run:

   mpirun -p4pg pgfile programsthatrunonnode0

Why would you run programs on node 0 if all the executables are
specfied in the pgfile?

If I were to implement this, I wouldn't am not sure I would want the
syntax you described.  Why specify the node name (amager, anholt, bogoe)
when the nodes are already in the ~/.gmpi/conf file unless you are trying
to run some codes on multiple nodes.

If you wanted to just create a special mpirun file to do this it should
be easy.  Look at lines 260 to 293 of mpirun.ch_gm (for mpich-1.2..5).  
This is the key to how mpirun starts a job.  For each process a command
line is formed, and then rsh is called (if on a remote node).  The most
important environment variable that gets set is GMPI_OPTS.

        $gmpi_opts = " GMPI_OPTS=m$lnode,n$nbnode ";

Each process must have a unique ID, and this is were it comes from.

I can give some directions on what to do if you are interested.
I am not fond of the format of the two examples you gave since
I let PBS determine which nodes a user gets, and I don't want them
to have to worry about rewrite a file in the formats you suggests.
Here we use syntax like:

   mpirun -np 4 a.out : -np 3 b.out

This would start a.out on 4 processors and b.out on 3 processors.

I may be able to make the code available, but I need to ask.  I am
hestitant because it is probably not directly useful to anybody
as mpirun has been modified for our local system and I don't know
how it would work with some trying to run a plain mpich-gm system
without PBS or any other hacks we have added.

Craig



On Mon, Mar 26, 2001 at 01:59:33PM -0500, Maria Hybinette wrote:
> 
> 
> 
> Hi, is there a way with MPICH-GM to run multiple programs in one
> application? For example, with LAM's MPI you can define different 
> programs using an "appfile" with the -v switch (mpirun -v appfile) 
> where appfile:
> 
>         {amager:ingrid:305} cat appfile
>         n0 hello-ping
>         n0-1 hello-pong
>         {amager:ingrid:304} mpirun -v appfile
> 
> 
> or with ANL's MPICH you can define different programs using the "procgroup 
> file" defined with the -p4pg switch (but here you can provide different 
> command line argument), i.e:
> 
>         {amager:ingrid:366} cat pgfile
>         amager 0 /net/hp20/ingrid/MPI/MPICC/hello-ping
>         anholt 1 /net/hp20/ingrid/MPI/MPICC/hello-pong
>         anholt 1 /net/hp20/ingrid/MPI/MPICC/hello-ping
>         bogoe  1 /net/hp20/ingrid/MPI/MPICC/hello-pong
>         {amager:ingrid:365} mpirun -p4pg pgfile programsthatrunonnode0
> 
> 
> Any help, or suggestion is appreciated.
>  
>  Thanks, 
>     Maria
> 
> 

-- 
Craig Tierney ([email protected])
phone: 303-497-3112