measurefs.reiser4(8) reiser4progs manual measurefs.reiser4(8)NAMEmeasurefs.reiser4 - the program for measuring reiser4 filesystem param‐
eters (fragmentation, node packing, etc.).
SYNOPSISmeasurefs.reiser4 [ options ] FILE
DESCRIPTIONmeasurefs.reiser4 is reiser4 filesystem measure program. You can esti‐
mate 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 fragmen‐
tation 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 fragmenta‐
tion) 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 speci‐
fied.
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 <umka@namesys.com>, <reiserfs-list@namesys.com>
SUPPORT
You can get support at http://www.namesys.com/support.html
SEE ALSOlibreiser4(8), debugfs.reiser4(8), mkfs.reiser4(8), fsck.reiser4(8)cpfs.reiser4(8)resizefs.reiser4(8)AUTHOR
This manual page was written by Yury Umanets <umka@namesys.com>
reiser4progs 28 Apr, 2003 measurefs.reiser4(8)
