bootchart.conf, bootchart.conf.d — Boot performance analysis graphing tool configuration files
When starting, systemd-bootchart will read the configuration
/etc/systemd/bootchart.conf, followed by
the files in the
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 overrides.
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
Configure the amount of samples to record in total before bootchart exits. Each sample will record at intervals defined by Frequency=.
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 (
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 of time=0.0.
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
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
If set to yes, enables logging and graphing of processes' PSS memory consumption.
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.