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LAT_MMAP(8)                         LMBENCH                        LAT_MMAP(8)


NAME

       lat_mmap - costs of mmapping and unmmapping varying file sizes


SYNOPSIS

       lat_mmap [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions> ]
       size file


DESCRIPTION

       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

       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
       Microsystems Computer Corporation.


SEE ALSO

       lmbench(8).


AUTHOR

       Carl Staelin and Larry McVoy

       Comments, suggestions, and bug reports are always welcome.

(c)1994 Larry McVoy                 $Date$                         LAT_MMAP(8)

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