how to specify hosts to mpiexec? -machinefile doesn't work

[Satish Balay]

Yes - to be able to use multiple hosts - you should use
--download-mpich-device=mpd option. The defualt
--download-mpich-device=pm gets you started off with minimal MPICH
config [but limits running all MPI jobs on the same machine.

Wrt configuring MPD - usually you would do:

cat > machinefile
host1
host2
ctrl-D

mpdboot -n 2 -f machinefile
mpiexec -n 2 binary
mpdallexit

There might be other issues specific to your cluster. For this, its
best to use MPI already installed [with the correct compilers] and
configured on this cluster, and use --with-mpi-dir option with petsc
[instead of --download-mpich option].

The other alternative is to read up on MPICH2 installation
instructions on how to configure MPICH2 and MPD on your specific
hardware setup.

Satish

On Tue, 2 Sep 2008, Farshid Mossaiby wrote:

> Hi,
> 
> I think you should add --download-mpich-pm=mpd and maybe also --download-mpich-device=<from mpich2 docs>. Try running ./config/configure.py --help for more description.
> 
> Hope this helps,
> 
> Best regards,
> Farshid Mossaiby
> 
> 
> --- On Tue, 9/2/08, Karl Zeilinger <zkarl at live.com> wrote:
> 
> > From: Karl Zeilinger <zkarl at live.com>
> > Subject: how to specify hosts to mpiexec? -machinefile doesn't work
> > To: petsc-users at mcs.anl.gov
> > Date: Tuesday, September 2, 2008, 3:40 PM
> > Hello,
> > I have installed PETSc with the following commands from the
> > installation documentation on the website, downloading a
> > local mpich installation:
> > >export PETSC_DIR=$PWD
> > >./config/configure.py --with-cc=gcc --with-fc=g77
> > --download-f-blas-lapack=1 --download-mpich=1
> > >make all test
> > 
> > A first test with a modified ex2.c from the tutorials
> > ("mpiexec -np 4  ./ex2") was successful, but
> > showed that all processes run on the local host, as no
> > machine file is given.
> > 
> > Trying to run:
> > >mpiexec -np 4 -machinefile
> > /opt/mpich/share/machines.LINUX ./ex2
> > produces this error:
> > >invalid mpiexec argument -machinefile
> > >Usage: mpiexec -usize  -maxtime  -exitinfo -l\
> > >               -n  -soft  -host  \
> > > ...
> > 
> > How can I specify the hosts which the mpich (downloaded
> > during the PETSc installation) is supposed to use?
> > 
> > Thanks
> > Karl
> > 
> > _________________________________________________________________
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> 
>       
> 
>