lat_mmap - costs of mmapping and unmmapping varying file sizes
lat_mmap [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ]
lat_mmap 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, i.e.,
Funding for the development of this tool was provided by Sun
Microsystems Computer Corporation.
Carl Staelin and Larry McVoy
Comments, suggestions, and bug reports are always welcome.
(c)1994 Larry McVoy $Date$