fincore(1) - NetBSD Manual Pages

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FINCORE(1)              NetBSD 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 pur-
     poses.

     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 implementa-
     tion.  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.

NetBSD 9.2                      January 5, 2012                     NetBSD 9.2