lat_pagefault man page on DragonFly

lat_pagefault man page on DragonFly

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LAT_PAGEFAULT(8)		    LMBENCH		      LAT_PAGEFAULT(8)

NAME
       lat_pagefault - measure the cost of pagefaulting pages from a file

SYNOPSIS
       lat_pagefault  [ -P <parallelism> ] [ -W <warmups> ] [ -N <repetitions>
       ] file [ file....  ]

DESCRIPTION
       lat_pagefault times how fast a page of a file can be faulted  in.   The
       file is flushed from (local) memory by using the msync() interface with
       the invalidate flag set.	 (Note that NFS does not send  this  over  the
       wire  so this makes for a handy way to measure the cost of going across
       the wire.)

       The benchmark maps in the entire file and the  access  pages  backwards
       using a stride of 256K kilobytes.

OUTPUT
       Output  format  is below; it prints the average cost of page faulting a
       page.

       Pagefaults on <file>: <d> usecs

BUGS
       Using a stride of 256K may be a bad idea because SCSI  controllers  may
       have caches bigger than that.

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_PAGEFAULT(8)

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