When starting, systemd-bootchart will read the configuration file
/etc/systemd/bootchart.conf, followed by the files in the
bootchart.conf.d directories. These configuration files determine
logging parameters and graph output.
The default configuration is defined during compilation, so a
configuration file is only needed when it is necessary to deviate
from those defaults. By default, the configuration file in
/etc/systemd/ contains commented out entries showing the defaults as
a guide to the administrator. This file can be edited to create local
When packages need to customize the configuration, they can install
configuration snippets in /usr/lib/systemd/*.conf.d/. Files in /etc/
are reserved for the local administrator, who may use this logic to
override the configuration files installed by vendor packages. The
main configuration file is read before any of the configuration
directories, and has the lowest precedence; entries in a file in any
configuration directory override entries in the single configuration
file. Files in the *.conf.d/ configuration subdirectories are sorted
by their filename in lexicographic order, regardless of which of the
subdirectories they reside in. If multiple files specify the same
option, the entry in the file with the lexicographically latest name
takes precedence. It is recommended to prefix all filenames in those
subdirectories with a two-digit number and a dash, to simplify the
ordering of the files.
To disable a configuration file supplied by the vendor, the
recommended way is to place a symlink to /dev/null in the
configuration directory in /etc/, with the same filename as the
vendor configuration file.
Configure the amount of samples to record in total before
bootchart exits. Each sample will record at intervals defined by
Configure the sample log frequency. This can be a fractional
number, but must be larger than 0.0. Most systems can cope with
values under 25–50 without impacting boot time severely.
Configures whether the left axis of the output graph equals
time=0.0 (CLOCK_MONOTONIC start). This is useful for using
bootchart at post-boot time to profile an already booted system,
otherwise the graph would become extremely large. If set to yes,
the horizontal axis starts at the first recorded sample instead
Configures whether the resulting graph should omit 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 0.001sec) will not be displayed
in the output graph.
Configures the output directory for writing the graphs. By
default, bootchart writes the graphs to /run/log.
Configures bootchart to run a non-standard binary instead of
/usr/lib/systemd/systemd. This option is only relevant if
bootchart was invoked from the kernel command line with
If set to yes, enables logging and graphing of processes' PSS
If set to yes, enables logging and graphing of the kernel random
entropy pool size.
Horizontal scaling factor for all variable graph components.
Vertical scaling factor for all variable graph components.
Display process control group.
This page is part of the systemd (systemd system and service manager)
project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a bug
report for this manual page, see
page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2016-08-07. If you dis‐
cover any rendering problems in this HTML version 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 manual page), send a mail
systemd 228 BOOTCHART.CONF(5)