  We examine the issue of assessing the efficiency of components of a parallel
program at the example of the MD package LAMMPS. In particular, we look at how
LAMMPS deals with the issue and explain why the approach adopted might lead to
inaccurate conclusions. The misleading nature of this approach is subsequently
verified experimentally with a case study. Afterwards, we demonstrate how one
should correctly determine the efficiency of the components and show what
changes to the code base of LAMMPS are necessary in order to get the correct
behavior.
