4.5 Optimization, compiler switches

In this section some mandatory or useful compiler flags are described. These have different functions:

• Enable necessary macro processing/expansion for the .F90 files.
• Force proper handling of binary I/O.
• Choose module for radiative transfer.
• Activate module for dust formation and/or magnetic field transport.
• Enable parallelization with OpenMP directives.
• Choose a version of a subroutine or loop which is optimized for a specific architecture.
• Tell the compiler if and what to inline.
• Improve the general performance.