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= HowToParallel =

It is possible to run CLaMS on multi-processor machines using MPI or OpenMP.

On the Ubuntu machines is the PGF compiler suite installed that has MPICH implemented.

In the following a short How to:

First it is necessary to make the path of the MPI libraries public by executing:

for 64bit machines:

{{{
. /opt/pgi/linux86-64/8.0-2/mpi.sh
}}}

for 32bit machines:

{{{
. /opt/pgi/linux86/8.0-2/mpi.sh
}}}

Then compile the needed programs by executing:

{{{
make useMPI=true
}}}

Before running the CLaMS script or a single program you have to execute:

{{{
ssh-add
}}}

This is necessary, because the processes communicate per ssh.

The programs must be called as following:

{{{
mpirun -np # program

# - number of processors

}}}