blkiomon - monitor block device I/O based o blktrace data
blkiomon -I interval [ -h file ] [ -b file ]
] [ -D file
] [ -Q path_name
] [ -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.
Set sample interval
Human-readable output file. Use '-' for
Binary output file. Use '-' for stdout.
Output file for data emitted by low level
Output file for debugging data. Use '-' for
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.html>. There
is NO WARRANTY, to the extent permitted by law.
btrace (8), blktrace (8), blkparse (1), verify_blkparse (1), blkrawverify (1),