NAME

       measurefs.reiser4 - the program for measuring reiser4 filesystem parameters (fragmentation, node packing,
       etc.).

SYNOPSIS

       measurefs.reiser4 [ options ] FILE

DESCRIPTION

       measurefs.reiser4   is   reiser4   filesystem  measure  program.  You  can  estimate  reiser4  filesystem
       fragmentation, packingm etc. structures by using it.

COMMON OPTIONS

       -V, --version
              prints program version.

       -?, -h, --help
              prints program help.

       -y, --yes
              assumes an answer 'yes' to all questions.

       -f, --force
              forces measurefs to use whole disk, not block device or mounted partition.

       -c, --cache N
              sets tree cache node number to passed value. This affects very much  behavior  of  libreiser4.  It
              affects speed, tree allocation, etc.

MEASUREMENT OPTIONS

       -S, --tree-stat
              shows different tree statistics (node packing, internal nodes, leaves, etc)

       -T, --tree-frag
              measures  total  tree  fragmentation.  The  result  is  fragmentation  factor - value from 0.00000
              (minimal fragmentation) to 1.00000 (maximal one). Most probably, this factor may affect sequential
              read performance.

       -D, --data-frag
              measures average files fragmentation. This means, that fragmentation of each  file  in  filesystem
              will  be  measured  separately  and results will be averaged. The result is fragmentation factor -
              value from 0.00000 (minimal fragmentation) to 1.00000 (maximal one).

              Note, that for the fresh filesystem (created not very long time ago)  and  even  fully  filled  by
              data, this value will be pretty small.

       -F, --file-frag FILE
              measures  fragmentation  of  the  specified  file. The result is fragmentation factor - value from
              0.00000 (minimal fragmentation) to 1.00000 (maximal one). Note, that fragmentation of a small file
              (depends of used tail policy), which consists of tail items, is not very reliable value.  That  is
              because, they is always afoot due to balancing.

              Examples:

              measurefs.reiser4 -F /usr/bin /dev/hda2
              measurefs.reiser4 -F /bin/bash /dev/hda2

       -E, --show-file
              show file fragmentation for each file if --data-frag is specified.

PLUGIN OPTIONS

       -p, --print-profile
              prints  the  plugin profile. This is the set of default plugins used for all parts of a filesystem
              -- format, nodes, files, directories,  hashes,  etc.  If  --override  is  specified,  then  prints
              modified plugins.

       -l, --print-plugins
              prints all plugins libreiser4 know about.

       -o, --override TYPE=PLUGIN, ...
              overrides the default plugin of the type "TYPE" by the plugin "PLUGIN" in the plugin profile.

              Examples:

              measurefs.reiser4 -o nodeptr=nodeptr41,hash=rupasov_hash /dev/hda2

REPORTING BUGS

       Report bugs to <reiserfs-devel@vger.kernel.org>

SEE ALSO

       debugfs.reiser4(8), mkfs.reiser4(8), fsck.reiser4(8)

AUTHOR

       This manual page was written by Yury Umanets <umka@namesys.com>

reiser4progs                                      28 Apr, 2003                              measurefs.reiser4(8)