ATLAS (Automatically Tuned Linear Algebra Software) is an ongoing research effort on applying empirical techniques in order to provide performance. At present it provides C and Fortran 77 interfaces to a portably efficient BLAS implementation, as well as a few routines from LAPACK.
Include commands like these in your job script.
module load atlas
Compile your code with a command like
gcc source.c -o executable-name -L$ATLAS/lib -l atlas
Run the executable with