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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | AUTHORS | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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BLKIOMON(8) BLKIOMON(8)
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 (C).
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.
-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
--dump-lldd=file
Output file for data emitted by low level device driver.
-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.
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 <linux-btrace@vger.kernel.org>
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.html>. There is NO WARRANTY, to the
extent permitted by law.
btrace (8), blktrace (8), blkparse (1), verify_blkparse (1),
blkrawverify (1), btt (1)
This page is part of the blktrace (Linux block layer I/O tracer)
project. Information about the project can be found at [unknown --
if you know, please contact man-pages@man7.org] It is not known how
to report bugs for this man page; if you know, please send a mail to
man-pages@man7.org. This page was obtained from the project's
upstream Git repository
⟨http://git.kernel.org/cgit/linux/kernel/git/axboe/blktrace.git/⟩ on
2018-02-02. (At that time, the date of the most recent commit that
was found in the repository was 2018-01-24.) If you discover any
rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
July 17, 2008 BLKIOMON(8)
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