fincore(1)
NAME
fincore - File IN CORE: show which blocks of a file are in core
SYNOPSIS
fincore [options] <-stdin | file [...]> Options: -help - brief help message -man - full documentation -summary - report summary statistics for the files -justsummarize - just report summary statistics for the files -stdin - read file names from standard input
OPTIONS
-help Shows usage information and exits.
-man Shows the manual page and exits.
- -summary
- Report summary statistics for the files.
- -nosummary
- Don't report summary statistics for the files. This is the
default. - -justsummarize
- Just report summary statistics for the files. I.e. don't show details for each file.
- -nojustsummarize
- Don't just report summary statistics for the files. This is
the default. - -stdin Read file names from standard input. This is to avoid "Arg
- list too long" with very many files.
DESCRIPTION
fincore is a command that shows which pages (blocks) of a file are in
core memory.
It is particularly useful for determining the contents of the buffercache. The name means "File IN CORE" and I pronounce it "eff in core".
EXAMPLES
$ fincore foo.rrd
foo.rrd: no incore pages.
$ cat foo.rrd >/dev/null # read the whole file
$ fincore foo.rrd
foo.rrd: 26 incore pages: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
$ ls |grep '\.rrd$' |~/perl/fincore --stdin --justsummarize
page size: 4096 bytes
2214049 pages, 8.4 Gbytes in core for 268994 files; 8.23 pages, 32.9 kbytes per file.
BUGS
In verbose mode, you may get an error from mincore such as "cannot
allocate memory" if the file size is zero.
- Some operating systems have posix_fadvise, but it doesn't work. For
instance under Linux 2.4, you may see this error: - posix_fadvise: Inappropriate ioctl for device
AUTHOR
Dave Plonka <plonka@cs.wisc.edu>
Copyright (C) 2007 Dave Plonka. This program is free software; you
can redistribute it and/or modify it under the terms of the GNU General
Public License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
VERSION
This is fincore $Revision: 1.9 $.
SEE ALSO
- The fadvise command.