BLKIOMON(8)
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 perdevice 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 (C) 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)