lat_mmap man page on DragonFly

lat_mmap man page on DragonFly

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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 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 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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