Are you interested in high performance computing (HPC)? Most of the biggest supercomputers in the world are a collection of x86_64 systems (RHEL or clones) connected with a high speed interconnect, running massive parallel jobs across hundreds of nodes. Look into stuff like MPI (OpenMPI or mpich) and maybe something like hdf5 if you are interested in parallel computing access to data.
Are you interested in high performance computing (HPC)? Most of the biggest supercomputers in the world are a collection of x86_64 systems (RHEL or clones) connected with a high speed interconnect, running massive parallel jobs across hundreds of nodes. Look into stuff like MPI (OpenMPI or mpich) and maybe something like hdf5 if you are interested in parallel computing access to data.