Manual Reference Pages - LAT_MMAP (8)
lat_mmap - costs of mmapping and unmmapping varying file sizes
-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 fundemental part of processes that use SunOS style shared libraries
(the libraries are mapped in at process start up time and unmapped at
The benchmark maps in and unmaps the first size bytes of the file
repeatedly and reports the average time for one mapping/unmapping.
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 ||LAT_MMAP (8) ||$Date$ |
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