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## page was renamed from HowToParallel
<<TableOfContents>>
= ParallelHowTo =

=== Portland Compiler ===

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

On the Ubuntu machines the PGF compiler suite is 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/linux86-64/10.4/mpi.sh
}}}

for 32bit machines:

{{{
. /opt/pgi/linux86/10.4/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-agent
> SSH_AUTH_SOCK=/tmp/ssh-arHtY17224/agent.17224; export SSH_AUTH_SOCK;
> SSH_AGENT_PID=17225; export SSH_AGENT_PID;
> echo Agent pid 17225;
> ssh-add .ssh/id_rsa
}}}

This is necessary, because the processes communicate per ssh.

The programs must be called as following:

{{{
mpirun -np # [ --all-local ] program

# - number of processors
use the option --all-local for running it on the CPUs of the local machine only.
}}}


=== Intel Compiler ===

The MPICH2 Library (1.3.2p1) is installed in directory ''/usr/local/icg/icg1/local/mpich2-intel'' (for Intel C and Fortran compilers).

Add the bin subdirectory of the installation directory to your path:
{{{
PATH=/usr/local/icg/icg1/local/mpich2-intel/bin:$PATH
export PATH
}}}

To read the man pages set MANPATH to the following:
{{{
MANPATH=/usr/local/icg/icg1/local/mpich2-intel/share/man:$MANPATH
export MANPATH
}}}

The programs can be compiled with:
{{{
make useComp=ifc useMPI=true <progname>
}}}

Execute on <n> CPUs:
{{{
mpiexec -np <n> <progname>
}}}

It may be necessary to unset the memory limit:
{{{
ulimit -s unlimited
}}}