blkiomon - monitor block device I/O based o blktrace data
blkiomon -I interval [ -h file ] [ -b file ] [ -d file ] [ -D file ] [
-Q path_name -q msg_queue_id -m msg_id ] [ -V ]
blkiomon is a block device I/O monitor. It periodically generates per-
device request size and request latency statistics from blktrace data.
It provides histograms as well as data that can be used to calculate
min, max, average and variance. For this purpose, it consumes D and C
traces read from stdin. Note, that this doesn't work for logical
volumes, as high-level drivers don't see the completion of the events
There are options for binary output and human-readable output to files
and stdout. Output to a message queue is supported as well.
There is no need to use blkparse with blkiomon. blkiomon is capable of
consuming binary output written to stdout by blktrace.
Set sample interval
Human-readable output file. Use '-' for stdout.
Binary output file. Use '-' for stdout.
Output file for data emitted by low level device driver.
Output file for debugging data. Use '-' for stdout.
Sets path_name as path name for existing message queue to be
used for binary output.
Sets msg_queue_id as ID for an existing message queue to be used
for binary output.
Sets msg_id as message identifier to be used for binary output
messages written to an existing message queue.
Print program version.
To get I/O statistics for /dev/sdw every 10 seconds for a period of one
hour, use the following command:
% blktrace /dev/sdw -a issue -a complete -w 3600 -o - | blkiomon -I
10 -h -
blkiomon and this man page were written by Martin Peschke.
Report bugs to <email@example.com>
Copyright © 2008 IBM Corp.
This is free software. You may redistribute copies of it under the
terms of the GNU General Public License
<http://www.gnu.org/licenses/gpl.php>. There is NO WARRANTY, to the
extent permitted by law.
btrace (8), blktrace (8), blkparse (1), verify_blkparse (1),
blkrawverify (1), btt (1)
July 17, 2008 BLKIOMON(8)