bootchart.conf, bootchart.conf.d — Boot performance analysis graphing tool configuration files
When starting, systemd-bootchart will read the
/etc/systemd/bootchart.conf, followed by
the files in the
directories. These configuration files determine logging
parameters and graph output.
Configuration files are read from directories in
/usr/lib/, in order of precedence.
Each configuration file in these configuration directories shall be named in
the style of
/etc/ override files with the same name in
/usr/lib/. Files in
/run/ override files with the same name in
Packages should install their configuration files in
/usr/lib/. Files in
reserved for the local administrator, who may use this logic to override the
configuration files installed by vendor packages. All configuration files
are sorted by their filename in lexicographic order, regardless of which of
the directories they reside in. If multiple files specify the same option,
the entry in the file with the lexicographically latest name will take
precedence. It is recommended to prefix all filenames with a two-digit number
and a dash, to simplify the ordering of the files.
If the administrator wants 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 is also read from a single configuration file in
/etc/. This 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
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 (
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 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
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 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.