Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
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 re-
       peatedly	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)

NAME | SYNOPSIS | DESCRIPTION | OUTPUT | ACKNOWLEDGEMENT | SEE ALSO | AUTHOR

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=lat_mmap&sektion=8&manpath=FreeBSD+12.1-RELEASE+and+Ports>

home | help