NAME
fincore —
query in-core status of file
pages
SYNOPSIS
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.