# USING ORSA WITH MPI SUPPORT IN FEDORA # Last change: Milos Jakubicek, July 24, 2009 There are 4 different builds of orsa with different MPI support: orsa(-devel) -- No MPI support orsa-openmpi(-devel) -- Built with OpenMPI support orsa-mpich2(-devel) -- Built with MPICH2 MPI support Environment-modules are used to enable parallel installation and usage of all of the supported MPI implementations. Before using orsa with MPI support, you have to load the particular module, which ensures setting proper PATH and LD_LIBRARY_PATH variables: First you have to load the functions: . /etc/profile.d/modules.sh followed by: module load openmpi-%{_arch} OR module load mpich2-%{_arch} You can use rpm --eval "%{_arch}" to find out proper values for your machine. For unloading a module substitute "load" with "unload" in the above commands.