iowatcher graphs the results of a blktrace run. It can graph the
result of an existing blktrace, start a new blktrace, or start a new
blktrace and a benchmark run. It can then create an image or movie
of the IO from a given trace. iowatcher can produce either SVG files
or movies in mp4 format (with ffmpeg) or ogg format (with
--help Print a brief usage summary.
-d, --device device
Controls which device you are tracing. You can only trace one
device at a time for now. It is sent directly to blktrace,
and only needed when you are making a new trace.
-D, --blktrace-destination destination
Destination for blktrace.
Run a program while blktrace is run. The program and its
arguments must be specified after all other options. Note
that this option previously required the program to be given
as a single argument but it now tells iowatcher to expect
extra arguments which it should be run during the trace.
-- End option parsing. If --prog is specified, everything after
-- is the program to be run. This can be useful if the program
name could otherwise be mistaken for an option.
Keep the SVG files generated for movie mode.
-t, --trace path
Specify the name of the file or directory in which blktrace
output is located. iowatcher uses a dump from blkparse, so
this option tries to guess the name of the corresponding per-
CPU blktrace data files if the dump file doesn't already
exist. To add multiple traces to a given graph, you can
specify --trace more than once. If path is a directory,
iowatcher will use the name of the directory as the base name
of the dump file and all trace files found inside the
directory will be processed.
-l, --label label
Sets a label in the graph for a trace file. The labels are
added in the same order as the trace files.
-m, --movie [style]
Create a movie. The file format depends on the extension used
in the -o file option. If you specify an .ogv or .ogg
extension, the result will be Ogg Theora video, if png2theora
is available. If you use an .mp4 extension, the result will
be an mp4 video if ffmpeg is available. You can use any other
extension, but the end result will be an mp4. The accepted
style values are spindle for a circular disc-like effect
(default) or rect for a rectangular graph style.
-T, --title title
Set a title to be placed at the top of the graph.
-o, --output file
Output filename for the SVG image or video. The video format
used will depend on the file name extension. See --movie for
-r, --rolling seconds
Control the duration for the rolling average. iowatcher tries
to smooth out bumpy graphs by averaging the current second
with seconds from the past. Larger numbers here give you
-h, --height height
Set the height of each graph
-w, --width width
Set the width of each graph
-c, --columns columns
Number of columns in graph output
-x, --xzoom min:max
Limit processed time range to min:max.
-y, --yzoom min:max
Limit processed sectors to min:max.
-a, --io-plot-action action
Plot action (one of Q, D, or C) in the IO graph.
Distinguish between processes in the IO graph.
-O, --only-graph graph
Add a single graph to the output (see section GRAPHS for
options). By default all graphs are included. Use -O to
generate only the required graphs. -O may be used more than
-N, --no-graph type
Remove a single graph from the output (see section GRAPHS for
options). This option may be used more than once.
Generate graph from the existing trace.dump:
# iowatcher -t trace
Skip the IO graph:
# iowatcher -t trace.dump -o trace.svg -N io
Only graph tput and latency:
# iowatcher -t trace.dump -o trace.svg -O tput -O latency
Generate a graph from two runs, and label them:
# iowatcher -t ext4.dump -t xfs.dump -l Ext4 -l XFS -o
Run a fio benchmark and store the trace in trace.dump, add a title to
the top, use /dev/sda for blktrace:
# iowatcher -d /dev/sda -t trace.dump -T 'Fio Benchmark' -p
Make a movie from an existing trace:
# iowatcher -t trace --movie -o trace.mp4
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License v2 as published
by the Free Software Foundation.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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 firstname.lastname@example.org] It is not known how
to report bugs for this man page; if you know, please send a mail to
email@example.com. This page was obtained from the project's
upstream Git repository
2017-03-13. If you discover any rendering problems in this HTML ver‐
sion 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 man‐
ual page), send a mail to firstname.lastname@example.org
iowatcher April 2014 iowatcher(1)