Provided by: lmbench-doc_3.0-a7-1ubuntu1_all bug

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 fundamental 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)