[Paraview] Multiple servers

[pat marion]

Hi David,

You'll want to change your mpirun command a little bit-

on machine X: mpirun -np 3 -machinefile machinefile.txt pvserver

This will run 3 instances of pvserver where each instance runs on one of the
machines specified in machinefile.txt.  Machinefile.txt will list the
machine hostnames, one per line.  You'll need to setup password-less ssh
from machine X to machines Y and Z, otherwise it will prompt you for a
password for each machine.

Here's a link to a little test program you can try.  It will have each mpi
process print out its rank and hostname so that you can confirm that each
process really is running on its own machine-
http://www.slac.stanford.edu/comp/unix/farm/mpi.html

Pat

On Wed, Jul 15, 2009 at 5:43 PM, David Doria <daviddoria at gmail.com> wrote:

> On Wed, Jul 15, 2009 at 3:53 PM, David E
> DeMarle<dave.demarle at kitware.com> wrote:
> > Yes.
> >
> > If you compile paraview from source and turn MPI on, then the server
> > process can be run as a parallel job (mpirun -np N pvserver).
> > Connecting to that parallel server and using it is no different than
> > the client/serial-server case.
> >
> > I vaguely recall that the Mac binaries are compiled this way, and can
> > be used directly. Mac are treated differently because the MPI library
> > on Macs is more standardized than elsewhere.
> >
> > David E DeMarle
>
> Hm, I still don't understand. I installed MPI and compiled with MPI on
> with 4 computers, call them A,X,Y, and Z. A is where I will be sitting
> working, and X,Y, and Z will be running paraview servers "helping" A
> to do its work.
>
> So on X,Y, and Z, I run
> mpirun -np 1 pvserver (there is only 1 core on each machine - is this
> what "number of processes" is looking for?)
>
> Now on computer A, how do I tell it to use all 3 of these servers
> (X,Y, and Z)? The only parallelization I've done before is with a
> single machine with more than one core, so telling it to run a process
> on several threads makes sense in that case - but we didn't tell X,Y,
> and Z to work together, so it seems like we now just have 3
> independent servers, that have now simply been started with 'mpirun'
> instead of with only 'pvserver'!
>
> Thanks,
>
> David
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