Although the profiling reports give a timing measurement, these appear
to be inaccurate and includes overheads due to the profiling
itself. In fact we simply time some sample calculations performed
using a compiled program using the unix time
command to get
measure the amount of CPU time required for the calculation. Note that
these timings include the time required to execute the program and to
compute the result back into decimal. The results give us an
approximate measure of the real time requirements of the system.