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SYSTEMD-BOOTCHART(1)			systemd-bootchart		     SYSTEMD-BOOTCHART(1)

NAME
       systemd-bootchart - Boot performance graphing tool

DESCRIPTION
       systemd-bootchart is a tool, usually run at system startup, that collects the CPU load,
       disk load, memory usage, as well as per-process information from a running system.
       Collected results are output as an SVG graph. Normally, systemd-bootchart is invoked by
       the kernel by passing init=/usr/lib/systemd/systemd-bootchart on the kernel commandline.
       systemd-bootchart will then fork the real init off to resume normal system startup, while
       monitoring and logging startup information in the background.

       After collecting a certain amount of data (usually 15-30 seconds, default 20 s) the
       logging stops and a graph is generated from the logged information. This graph contains
       vital clues as to which resources are being used, in which order, and where possible
       problems exist in the startup sequence of the system. It is essentially a more detailed
       version of the systemd-analyzeplot function.

       Of course, bootchart can also be used at any moment in time to collect and graph some data
       for an amount of time. It is recommended to use the --rel switch in this case.

       Bootchart does not require root privileges, and will happily run as a normal user.

       Bootchart graphs are by default written time-stamped in /run/log and saved to the journal
       with MESSAGE_ID=9f26aa562cf440c2b16c773d0479b518. Journal field BOOTCHART= contains the
       bootchart in SVG format.

INVOCATION
       systemd-bootchart can be invoked in several different ways:

       Kernel invocation
	   The kernel can invoke systemd-bootchart instead of the init process. In turn,
	   systemd-bootchart will invoke /sbin/init.

       Started as a standalone program
	   One can execute systemd-bootchart as normal application from the commandline. In this
	   mode it is highly recommended to pass the -r flag in order to not graph the time
	   elapsed since boot and before systemd-bootchart was started, as it may result in
	   extremely large graphs.

OPTIONS
       These options can also be set in the /etc/systemd/bootchart.conf file. See
       bootchart.conf(5).

       -h, --help
	   Prints a short help text and exits.

       -n, --sample N
	   Specify the number of samples, N, to record. Samples will be recorded at intervals
	   defined with --freq.

       -f, --freq f
	   Specify the sample log frequency, a positive real f, in Hz. Most systems can cope with
	   values up to 25-50 without creating too much overhead.

       -r, --rel
	   Use relative times instead of absolute times. This is useful for using bootchart at
	   post-boot time to profile an already booted system. Without this option the graph
	   would become extremely large. If set, the horizontal axis starts at the first recorded
	   sample instead of time 0.0.

       -F, --no-filter
	   Disable filtering of tasks that did not contribute significantly to the boot.
	   Processes that are too short-lived (only seen in one sample) or that do not consume
	   any significant CPU time (less than 0.001 s) will not be displayed in the output
	   graph.

       -C, --cmdline
	   Display the full command line with arguments of processes, instead of only the process
	   name.

       -o, --output path
	   Specify the output directory for the graphs. By default, bootchart writes the graphs
	   to /run/log.

       -i, --init path
	   Use this init binary. Defaults to /sbin/init.

       -p, --pss
	   Enable logging and graphing of processes' PSS (Proportional Set Size) memory
	   consumption. See filesystems/proc.txt in the kernel documentation for an explanation
	   of this field.

       -e, --entropy
	   Enable logging and graphing of the kernel random entropy pool size.

       -x, --scale-x N
	   Horizontal scaling factor for all variable graph components.

       -y, --scale-y N
	   Vertical scaling factor for all variable graph components.

OUTPUT
       systemd-bootchart generates SVG graphs. In order to render those on a graphical display
       any SVG capable viewer can be used. It should be noted that the SVG render engines in most
       browsers (including Chrome and Firefox) are many times faster than dedicated graphical
       applications like Gimp and Inkscape. Just point your browser at file:///run/log/!

HISTORY
       This version of bootchart was implemented from scratch, but is inspired by former
       bootchart incantations:

       Original bash
	   The original bash/shell code implemented bootchart. This version created a compressed
	   tarball for processing with external applications. This version did not graph
	   anything, only generated data.

       Ubuntu C Implementation
	   This version replaced the shell version with a fast and efficient data logger, but
	   also did not graph the data.

       Java bootchart
	   This was the original graphing application for charting the data, written in java.

       pybootchartgui.py
	   pybootchart created a graph from the data collected by either the bash or C version.

       The version of bootchart you are using now combines both the data collection and the
       charting into a single application, making it more efficient and simpler. There are no
       longer any timing issues with the data collector and the grapher, as the graphing cannot
       be run until the data has been collected. Also, the data kept in memory is reduced to the
       absolute minimum needed.

SEE ALSO
       bootchart.conf(5)

BUGS
       systemd-bootchart does not get the model information for the hard drive unless the root
       device is specified with root=/dev/sdxY. Using UUIDs or PARTUUIDs will boot fine, but the
       hard drive model will not be added to the chart.

       For bugs, please contact the author and current maintainer:
	   Auke Kok <auke-jan.h.kok@intel.com>

systemd 208								     SYSTEMD-BOOTCHART(1)
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