Compiler Variants Here are the compiler options on the new side of the cluster (gplogin2/3).  gnu => GCC ; intel => Intel Parallel Studio XE ; mkl => Intel Math Kernel Library For MPI Variants see this page . Compiler/Version To use gnu/4.8.5 gnu/7.2.0 gnu/7.3.0 gnu/8.1.0 gnu/8.2.0 gnu/8.3.0 gnu/9.1.0 ml gnu/4.8.5 ml gnu/7.2.0 ml gnu/7.3.0 ml gnu/8.1.0 ml gnu/8.2.0 ml gnu/8.3.0 ml gnu/9.1.0 intel/2017.2 intel/2017.4 intel/2017.5 intel/2018.0 intel/2018.1 intel/2018.2 intel/2018.3 ml intel/2017.2 ml intel/2017.4 ml intel/2017.5 ml intel/2018.0 ml intel/2018.1 ml intel/2018.2 ml intel/2018.3 intel/2018.0 + mkl intel/2018.1 + mkl intel/2018.2 + mkl intel/2018.3 + mkl ml intel/2018.0 mkl ml intel/2018.1 mkl ml intel/2018.2 mkl ml intel/2018.3 mkl Note: If you require MKL, please use a recent version from 2018 and newer versions are supposed to be backward compatible.