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iowatcher(1)									     iowatcher(1)

       iowatcher - Create visualizations from blktrace results

       iowatcher OPTIONS...

       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 png2theora).

       --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

       -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 corresponding 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 extension, 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.

       Choices for -O and -N are:
	  io, tput, latency, queue_depth, iops, cpu-sys, cpu-io, cpu-irq, cpu-user, cpu-soft

       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

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