BLKIOMON 8 "July 17, 2008" "" ""



 NAME
blkiomon - monitor block device I/O based o blktrace data



 SYNOPSIS
 blkiomon -I interval [ -h file ] [ -b file ] [ -D file ] [ -Q path_name
-q msg_queue_id -m msg_id ] [ -V ]





 DESCRIPTION
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.

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.



 OPTIONS

-I interval


--interval=interval


Set sample interval



-h file


--human-readable=file


Human-readable output file. Use '-' for stdout.



-b file


--binary=file


Binary output file. Use '-' for stdout.



-D file


--debug=file


Output file for debugging data. Use '-' for stdout.



-Q path_name


--msg-queue=path_name


Sets path_name as path name for existing message queue to be used
for binary output.



-q msg_queue_id


--msg-queue-id=msg_queue_id


Sets msg_queue_id as ID for an existing message queue to be used
for binary output.



-m msg_id


--msg-id=msg_id


Sets msg_id as message identifier to be used for binary output
messages written to an existing message queue.



-V


--version


Print program version.





 EXAMPLES
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 -



 AUTHORS
blkiomon and this man page were written by Martin Peschke.



 "REPORTING BUGS"
Report bugs to <linux-btrace@vger.kernel.org>



 COPYRIGHT
Copyright \(co 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.html>.
There is NO WARRANTY, to the extent permitted by law.



 "SEE ALSO"
btrace (8), blktrace (8), blkparse (1), verify_blkparse (1), blkrawverify (1),
btt (1)