The data is not accessed in the user program; the benchmark relies on the operating systems read interface to have actually moved the data. Systems that implement page flipping may fool this benchmark.
The benchmark is intended to be used on a file that is in memory, i.e., the benchmark is a reread benchmark. Other file benchmarking can be done with lmdd(8).
The size specification may end with ``k'' or ``m'' to mean kilobytes (* 1024) or megabytes (* 1024 * 1024).
"%0.2f %.2f\\n", megabytes, megabytes_per_second, i.e.,