lat_mmap - costs of mmapping and unmmapping varying file sizes
[ -P <parallelism>
] [ -W <warmups>
[ -N <repetitions>
] size file
times how fast a mapping can be made and unmade. This is useful
because it is a fundamental part of processes that use SunOS style shared
libraries (the libraries are mapped in at process start up time and unmapped
at process exit).
The benchmark maps in and unmaps the first size
bytes of the file
repeatedly and reports the average time for one mapping/unmapping.
The size specification may end with ``k'' or ``m'' to mean kilobytes (* 1024) or
megabytes (* 1024 * 1024).
Output format is "%0.2f %d\n", megabytes, usecs
Funding for the development of this tool was provided by Sun Microsystems
Carl Staelin and Larry McVoy
Comments, suggestions, and bug reports are always welcome.