3.8 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.