Parallel compilation tips of quantum espresso

1. Compile MPI package

• When there is error about can't find file ("*so*") when try to run "mpirun" command, try "sudo ldconfig" to update shared library.

   OR Install MPI package from (Ubuntu) software center

• Search MPICH or OpenMPI in software center
• When using OpenMPI, install "libopenmpi-dev" to get the wrapper parallel compiler (mpicc mpif90).

2. Compile the QE

• Run ./configure
• make all