iowatcher(1)iowatcher(1)NAMEiowatcher - Create visualizations from blktrace results
SYNOPSISiowatcher OPTIONS...
DESCRIPTIONiowatcher 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 png2theora).
OPTIONS--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.
-p, --prog <program>
Program to run while blktrace is run.
-K, --keep-movie-svgs
Keep the SVG files generated for movie mode.
-t, --trace <file|directory>
Controls the name of the blktrace file. iowatcher uses a dump
from blkparse, so -t tries to guess the name of the correspond‐
ing per CPU blktrace data files if the dump file doesn't already
exist. If you want more than one trace in a given graph, you
can specify -t more than once. If a directory is specified,
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 the trace files are added.
-m, --movie [spindle|rect]
Create a movie. The file format depends on the extension used
in the -o filename.* 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 exten‐
sion, but the end result will be an mp4. You can use
--movie=spindle or --movie=rect, which changes the style of the
IO mapping.
-T, --title <title>
Set a title to be placed at the top of the graph.
-o, --output <file>
Output filename (default: trace.svg).
-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 flatter
graphs.
-h, --height <height>
Set the height of each graph
-w, --width <width>
Set the width of each graph
-c, --columns <columns>
Numbers 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 given action (one of Q,D,C) in IO graph
-P, --per-process-io
Distinguish between processes in IO graph
-O, --only-graph <graph>
Add a single graph to the output (see GRAPHS). By default all
the graphs are included, but with -O you get only the graphs you
ask for. -O may be used more than once.
-N, --no-graph <type>
Remove a single graph from the output (see GRAPHS). This may
also be used more than once.
GRAPHS
Choices for -O and -N are:
io, tput, latency, queue_depth, iops, cpu-sys, cpu-io, cpu-irq, cpu-
user, cpu-soft
EXAMPLES
Generate graph from the existing trace.dump:
iowatcher-t trace.dump -o trace.svg
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 trace.svg
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 'fio
some_job_file'
Make a movie from an existing trace:
iowatcher-t trace --movie -o trace.mp4
iowatcher(1)
