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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
⟨https://git.kernel.org/pub/scm/linux/kernel/git/axboe/blktrace.git⟩
on 2024-06-14. (At that time, the date of the most recent commit
that was found in the repository was 2024-06-12.) 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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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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