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

       systemd-bootchart - Boot performance graphing tool

       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=/lib/systemd/systemd-bootchart on the kernel command line.
       systemd-bootchart will then fork the real init off to resume normal
       system startup, while monitoring and logging startup information in the

       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-analyze plot 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.

       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

       Started as a standalone program
           One can execute systemd-bootchart as normal application from the
           command line. 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. The time elapsed since boot might also include any time
           that the system was suspended.

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

       -h, --help
           Print a short help text and exit.

       -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

       -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.

       -g, --control-group
           Display process control group

       -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 /lib/systemd/systemd.

       -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.

       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

       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

       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.
           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.


       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 <>

systemd 229                                               SYSTEMD-BOOTCHART(1)
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