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lat_mmap - costs of mmapping and unmmapping varying file sizes
lat_mmap
[ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ] size file
lat_mmap
times how fast a mapping can be made and unmade. This is useful because
it is a fundemental 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 CB"%0.2f %d\n", megabytes,
usecs, i.e.,
8.00 1200
Funding for the development of this
tool was provided by Sun Microsystems Computer Corporation.
lmbench(8)
.
Carl Staelin and Larry McVoy
Comments, suggestions, and bug reports
are always welcome.
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