_do   => debug on, omp only on
_ds   => debug on, serial mode (neither mpi nor omp)

_o    => debug off, omp only on
_s    => debug off, serial mode (neither mpi nor omp)

tools__ds => options for tools, debug on, serial mode
tools__do => options for tools, debug on, omp only on
tools__o  => options for tools, debug off, omp only on
