LAT_MMAP(8) LMBENCH LAT_MMAP(8)NAMElat_mmap - costs of mmapping and unmmapping varying file sizes
SYNOPSISlat_mmap [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ]
size file
DESCRIPTIONlat_mmap times how fast a mapping can be made and unmade. This is use‐
ful 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
Output format is "%0.2f %d\n", megabytes, usecs, i.e.,
8.00 1200
ACKNOWLEDGEMENT
Funding for the development of this tool was provided by Sun Microsys‐
tems Computer Corporation.
SEE ALSOlmbench(8).
AUTHOR
Carl Staelin and Larry McVoy
Comments, suggestions, and bug reports are always welcome.
(c)1994 Larry McVoy $Date$ LAT_MMAP(8)