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NetBSD 6.1.5 - man page for fincore (netbsd section 1)

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FINCORE(1)			   BSD General Commands Manual			       FINCORE(1)

NAME
     fincore -- query in-core status of file pages

SYNOPSIS
     fincore [-qs] file ...

DESCRIPTION
     The fincore utility queries and displays in-core status of specified files.

     Note that the result can already be stale when being output due to other activities in the
     system.  Thus it should be used only for advisory purposes.

     The fincore utility accepts the following options.

     -q        The quiet mode.	Outputs nothing unless the file has in-core pages.

     -s        The summary mode.  Only shows number of pages.

EXAMPLES
     The following example shows that /bin/cat and /bin/cp are fully cached in-core while the
     other executables are not in-core.  numbers shown in the default output are page indexes in
     the file of each in-core pages.

     % fincore /bin/c*
     /bin/cat: 0 1 2 3
     /bin/chio:
     /bin/chmod:
     /bin/cp: 0 1 2 3 4 5
     /bin/cpio:
     /bin/csh:
     % fincore -s /bin/c*
     /bin/cat: 4 / 4 in-core pages (100.00%)
     /bin/chio: 0 / 5 in-core pages (0.00%)
     /bin/chmod: 0 / 3 in-core pages (0.00%)
     /bin/cp: 6 / 6 in-core pages (100.00%)
     /bin/cpio: 0 / 36 in-core pages (0.00%)
     /bin/csh: 0 / 41 in-core pages (0.00%)

SEE ALSO
     mincore(2)

AUTHORS
     The fincore utility is written by YAMAMOTO Takashi.

CAVEATS
     The concept of page cache is an implementation detail of the kernel.  The fincore utility
     works using some assumptions on the current implementation.  Thus it might stop working in a
     future version of NetBSD.

BUGS
     The amount of CPU time the current implementation of fincore utility would take is roughly
     proportional to the file sizes.  Ideally it should be proportional to the number of in-core
     pages.

BSD					 January 5, 2012				      BSD
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