** RZ's cluster
- access 
  ssh <your_login>@cluster-linux.rz.rwth-aachen.de

- documentation
  https://doc.itc.rwth-aachen.de/display/CC/General

- modules
  module avail
  module unload gcc
  module load gcc/6

- compilers
  icc chol.c -o icc-chol.x  -mkl
  gcc chol.c -o gcc-chol.x  -L..whereBLAS? -l..BLAS? -lfortran? -lm? -lpthread?

- multi-threading
  MKL_NUM_THREADS, OPENBLAS_NUM_THREADS 

  export OPENBLAS_NUM_THREADS=8
  setenv OPENBLAS_NUM_THREADS 2